11-13, respectively) views the same illustration rotated anti-clockwise to view the stress mapping as it appears from the open end of the end fitting. Reference is now made to "EXTERIOR SURFACE PROFILE" illustrations 17-19 (FIGS. Results on both Pentium-based and Cyrix 6x86-based processors were found to be identical in all trials. Online shopping from a great selection at DIY & Tools Store. For purposes of the finite element analysis, each model is presented in axisymmetrical form, represented in a two dimensional drawing of a three dimensional bilaterally symmetrical physical shape. Negative load is very destructive to the wedges of prior art designs, causing catastrophic shear failure of the wedge. With the solving of rod manufacturing problems such as looping, the steel connectors or end fittings between rods have proven to be the source of most composite rod failures or end fitting pullouts. The fire-retardant resin material is easily fabricated when compared to metal products. The wedge is formed by a rod receptacle having an interior surface shaped to form at least one generally wedge-shaped annulus between the interior surface of the receptacle and the end of the rod received by the receptacle. 89 FSRs were developed to improve the operation characteristics of artificial lift rod pumping systems in crude oil production. Also known as duct rods, cable rods are used to assist in directing all types of cables in a wide variety of installations. Specifically, the shape of the distortion approximates the shape of the wedges. Title: Fiberglass sucker rod end fitting. The exhibition of catastrophic failure is usually a result of improper maintenance and materials handling procedures. Check for tags. a body of initially flowable adhesive that cures to bond to said rod and to solidify to form a wedge to cooperate with said annulus. The present invention relates to an end fitting or connector for connecting rods end-to-end, and particularly fiberglass or composite sucker rods for use in an oil well. Another object of the present invention is to provide a connector for connecting rods end to end, wherein the connector distributes stress forces acting on the rods from the connector equally across the diameter of the rods. These areas lead to destruction of the rod/adhesive layer, leading to catastrophic failure as described above. Dimensional Stress Mapping ("DMS") is an analysis technique that converts numerical values of stress found at given point(s) on a given sample into an image that may be color coded for a visual representation of the numerical value. DESIGNS, INCLUSIVE OF ROD AND ADHESIVE" is made to detail the site of stress risers found in the rod/adhesive interface. . Sucker rods are connected together in a string by steel connectors attached to the ends of each rod. Made of stainless steel with RTG Ø 12 mm thread Scope of delivery: 1 piece connecting sleeve with RUNPOTEC RTG Ø 12 mm thread for glass fibre rods Ø 15 mm Transition surface 16 of the receptacle 12 is formed in the shape of a wave having an outward tapered portion nearer said open end 32 and inward tapered portion nearer said closed end 34. Wedges transmit the stress and strain forces of pumping from the steel connector to the fiberglass rod causing the rod to deform. Electrical Supply Industry, rail, telecoms, arboricultural... whatever your area of expertise, we can supply the best tools and equipment for each and every job. . For the Gamma design, Illus. Continuous fibreglass rods, which are also known as cobras, is flexible pipe rodding. The Alpha design, illus. The metal end fitting is harder than the hardened adhesive, and deforms the shape of the hardened adhesive wedge. 8-10, respectively) identify the following landmarks: Z axis=7.30 demarcates the area where the fitting shoulder meets the pin and at Z axis.about.6.80-5.40 outlines the wrench flat area in all illustrations. The transition portion 16 does not curve concavely to meet the exterior surface of the rod member 22, but curves asymptotically so that the surface 16 approaches the cylindrical rod surface 22 asymptotically rather then arcuately or tangentially. The transition surface 16 from said first annular surface 15 and said second annular surface 17 is defined by the region between lines a--a. Among the mechanical forces acting on the rod/adhesive/metal interface, are compressive forces, such as during a stroke of the pump either up or down, and negative load forces. Adapter, Insulated, 2part Knuckle, Top Rod to Top, Bahco pruning head, component only, P3437, Bottom rod, heavy duty, hollow, 1.2 metre, Brass spring and clip set for inter / bottom rod, Hastings HV-230 telescopic operating rod (5 1/2' to 30'), Hastings HV-230 telescopic operating rod (5 1/2' to 30'), SP spec, Hastings HV-230S telescopic operating rod (4 1/4' to 21'). A method of connecting an attachment to the end of a fiberglass rod, tube or other profile. As shown in FIG. The concentrated forces may exceed the structural strength of the composite material of the rod, resulting in rod failure from cracking or splintering. & Terms of Use. In such cases, it is conventional to use a sub-surface pump to force the oil out of the well. Thus, any attempt to minimize the destructive forces leading to catastrophic failure must be focused on the fiberglass/adhesive/metal interface. Thus, the cross-section of surface 16 is S-shaped, sine-waved shaped, or simply wave-shaped, in reference to the asymptotic character of the curvature of the transition surface. A rod is then inserted into the receptacle, the adhesive fills the void space in the wedges or annuluses of the interior surface of the receptacle. Application is a continuation of U.S. patent application There are no abrupt changes in curvature to create regions of high stress in the fiberglass sucker rod, possibly resulting in rod failure. Connector member 10 also includes a pair of diametrically opposite flat surfaces 30 for enabling an oil field operator to attach a standard sucker rod wrench thereto for connecting and/or disconnecting the individual sucker rod end fittings 10 from one another. For purposes of the present disclosure, the term "wave," "wave-shaped," "sine-wave" or "S-shaped" refers to the asymptotic character of the curvature of the present transition surfaces. Close the cookie policy warning. Motors is easy to navigate by vehicle type, category of items, sales and events, or brand and type of car, motorcycle, pickup, or van. The soft contours of the transition surfaces of the present invention distribute the forces acting on the rod such that said forces do not exceed the material strength of the rod. Fibreglass GRP rods are pultruded with a high volume fraction of unidirectional fibreglass in a polyester matrix to BS EN 13706 specifications. Any curvature of an annular transition surface that is not asymptotic will create an abrupt discontinuity in the wedge formed thereby, possibly resulting in the spiking of destructive forces into the rod body. Rotocon connectors and mounting bases are made of die-cast Lexan, Zinc and Aluminum alloys. Rods currently offered go as small as a 5’7″ Zero weight and up to 8′ 6 weight and are available in a wide range of colours. The spike is a manifestation of the concentration of force caused by the abrupt discontinuity in the wedges and such concentrated forces may exceed the material strength of the rod, particularly where the spike is impelled into the rod at the interface of the rod and the adhesive. Fiberglass Poles with Quick-Connect Ends: just one type from our full range of Fiberglass Pole sets. By continuing to use the site you agree to our use of cookies. Electricians cable rods are flexibile, enabling cables to be pushed through or around objects. Stress distribution in this model is highlighted by the following: There exists a sharp and distinguishable stress riser found at the conjunction of the beginning of the wedge section and the fiberglass rod, beginning at the adhesive layer and radiating inward and upward in the rod section. Go to My Project List Continue Shopping You are not logged in to save your list permanently. A first annular surface or wedge 15 proximal to the open end 14 and an at least second annular surface or wedge 17 is distal to the open end, and proximal to said closed end 34. Join Free Now The present end fitting comprises at least one annulus to form at least one annular wedge. If the wedges have an abrupt change of cross sectional area such as a point of transition from one wedge to the next successive wedge, the shape of the abrupt change will be echoed in the shape of the distortion, with the result that the distortion takes on a "spiked" shape. Physical measurement was performed on each end fitting. Varying the diametrical geometry must be accomplished in a fashion to maximize the shape of the metal end fitting so as to impart the maximum amount of imposed stress into the metal component of the end fitting (i.e., the strongest component of the system). TradeFord.com is a growing Manufacturer Directory and B2B Marketplace connecting Global Fiberglass Rods Importers, Exporters, Suppliers, Traders and Manufacturers at a reliable, common platform. They are corrosion and rust resistant which leads to a long product life. For purposes of commonality and clarity, those common areas are not included in the finite element analysis report. This The spike is a manifestation of the concentration of force caused by the abrupt discontinuity in the wedges. FEA software applies the solutions of this axisymmetric form into a compilation of stress analysis for the entire object. a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, and a second section converging outward toward said rod, said defined annulus approaching the rod asymptotically and providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces; a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward for a given distance toward said rod at a given angle, a third section converging axially inward and away from said rod, and a fourth section converging outward for a distance less than said given distance toward said rod and approaching said rod at an angle larger than said given angle, said defined annulus providing a pair of wedges, each having a leading edge for distributing positive forces and a trailing edge for distributing negative forces. 5-7, respectively) labeled "Comparison of Stress Distribution," contained herein, are dithered view representations of the stress values found in the applied load case. We sell a wide range of composites rods, tubes and sheets - Fibreglass sheets in various sizes and produced in 2mm or 4mm thickness on site here, as are our carbon fibre sheets. The long sought after a goal of a sucker rod end fitting that uniformly distributes compressive forces, which generates no region of concentrated compressive forces, and yet still provides cooperating wedges to assure effective transmission of force, is finally achieved in the end fitting of the present invention. The distinction between asymptotic curvature versus arcuate or tangential curvature being that a tangential or arcuate curve retains the potential to intersect with or contact the outer surface of the rod if the curve is sufficiently extrapolated, whereas an asymptotic curve is an infinite regression that will not intersect with the rod regardless of any extrapolation of the curve. We will continue to provide our goods and services through these times and will do so in a safe, socially conscious way. Wedges transmit the compressive and tensing forces of pumping from the steel connector to the fiberglass rod and vice-versa. Helping your dreams take flight. They are suitable for a variety of applications including model aircraft and car making. Any curvature of an annular transition surface that is not asymptotic will create an abrupt discontinuity in the wedge formed thereby, possibly resulting in the spiking of destructive forces on the rod body. In each FEA and DSM technique, processor functions were verified by performing analysis on identical models to determine floating point math calculation accuracy. For identification purposes, the three samples are assigned names of "alpha," "beta" and "gamma". Using data gathered in stress analysis, DSM illustrations are generated and presented to compare/contrast the differences in stress values according to the individual geometry of each model. The following procedure applies to various diameters of rod sizes, and the principles and practices remain the same regardless of rod size. Please enter your details below and one of our advisors will call you back. It is critical that the rods be manufactured so as to prevent looping of the rovings or other imperfections which introduce flaws in the rod body greatly increasing the odds of rod failure in the field. A compressive force is imparted to the rod itself as the metal connector and the adhesive wedge press against each other to resist any further slippage. The pocket formed by the uppermost wedge contains very small values of stress both in absolute terms and in relation to the lower pocket. Frequency 29 posts / month Since Jul 2008 Blog thefiberglassmanifesto.blogs.. Comparing these views with the rod/adhesive profiles, a direct correlation between the stresses found in these components are confirmed. It is a further object of the present invention to provide a sucker rod end fitting wherein the transition from one wedge to the next contains no abrupt discontinuities. Find a rods on Gumtree in Essex, the #1 site for classifieds ads in the UK. 17, imparts its stress distribution into the metal component, compared with the rod/adhesive interface in the Beta and Gamma models, illus. Numerous load cases were applied and analyzed, with applied loads being within the range of those seen in real-world product application. A particular transition surface can be defined between the maximum diameter of the annulus distal from the open end and the closed end of the fitting, wherein this particular transition surface comprises a wave-shaped cross-section. These areas are found to equal in reaction in all models, and are not included in this report. The annulus(es) are filled with an initially flowable adhesive which hardens in the annular space(s) to form a wedge or series of axially aligned wedges. Therefore, it is an object of the present invention to provide a sucker rod end fitting in which compressive forces are not excessive in any portion of the rod. Midlands, South Carolina, United States About Blog The Fiberglass Manifesto is a blog which updated daily keeping up with news and stories of fiberglass fly rod builders and really anything else in the fly fishing industry that I think is notable as well. generation, Coupling pin for sucker rod made of fiber-reinforced plastic material, <- Previous Patent (Quasi-kinematic coup...). 5, corresponds to the present invention. Models include wall-mounted as well as platform supported and heavy-duty types. For comparison purposes, consideration effort was made to align the dimensional stress mapping grids with the corresponding grids found in the FEA analysis. Ideally, the distortions are squeezed by the end fitting out toward the end of the rod, transmitting the forces, at least to some extent, into the metal end fitting for optimum dispersal of destructive forces. 3, values obtained in elements corresponding to adhesive components (circled) are listed at the Y-axis=0.60, Z-axis=3.30 to 3.10; Y=0.55, Z=4.60 to 3.90, and Z=3.40 to 1.20; Y=0.50, Z=5.00 to 100; Y=-0.50, Z=5.00 to 1.00; Y=-0.55, Z=4.60 to 3.90 and Z=3.40 to 1.20; Y=-0.60, Z=3.30 to 3.10, elements corresponding to fiberglass (bracket) are listed at Y-axis=-0.45 to 0.45 and Z-axis=5.00 to 1.00; and elements corresponding to metal components are listed in the remainder of the Illustration. Serves as a connecting piece for glass fibre rods Ø 15 mm, which can be bonded with the RUNPOTEC special adhesive or to repair any fractures. In the presented illustrations, each contains sufficient landmark information for proper identification of such areas. ... connecting polish rod to sucker rod or pony rod be certain a polished rod coupling is used. © 2004-2021 FreePatentsOnline.com. 25 is a horizontal cross-sectional view of an exemplary sucker rod construction. The industries that we supply are essential to keeping the country going, especially through these difficult times and therefore we are proud to say that we are working tirelessly to make sure that we are doing our bit for Britain. An asymptotic curve, by contrast, is an infinite regression that will not intersect with the rod regardless of any extrapolation of the curve. Axial forces applied to a rod cause deformations of the rod material. They are lightweight, strong and durable, and suitable in all climates and temperatures. Such concentrated forces may exceed the material strength of the rod, particularly where the spike is impelled into the rod at the interface of the rod and the adhesive. In the present connector, the thick portion of the wedge or wedges approaches the rod asymptotically. The Beta design, illus. Geometric differences are then compared and contrasted according to the element location in table form. It becomes apparent that the internal geometry of end fitting design is critical in imposed stress distribution. 15 and 16 respectively, detail significantly high levels of imposed stress in the adhesive layer, possibly to destructive levels. 20-22, respectively). 2. Surface 18 is present in the present invention even for an embodiment comprising only a single wedge. There is a need, therefore, for a sucker rod end fitting in which compressive forces are transmitted to the fiberglass rod without excessive concentration of compressive forces in any portion of the rod. 25, the connector member 10 is formed to define an axial receptacle 12 for receiving an end of the sucker rod element 14. As stress values in the metal component are increased, the stress values in the rod are decreased, and vice versa. In fact, the present invention is so effective at directing said forces that the forces are actually directed to some extent into the metal end fitting (negative force benefits)--achieving the ideal objective of FSR connectors. Each rod is composed of bundles of glass filaments (rovings) approximately 15 microns in diameter that have been wetted with a resin and formed into a rod. Associated Utility Supplies Ltd All come with a spring-loaded male and female quick connect couplings that allow you to use the full Puma line of tools with your set. The resulting stress concentration is de-energized by one of two methods: A. Shear forces spike into the fiberglass rod locally to the is discontinuity of the metal; the shear forces develop perpendicular to the diameter of the glass fibers and the resultant shear beaks the glass fibers causing failure. Failure analysis of early FSR designs revealed the following: A. Particular geometry of the individual models is considered throughout the analysis. These rods do all the work and you can really feel the cast. Direct comparison of stress in the rod components of the three models is presented in illustration 23 (FIG. Unlike other wedge designs examined by computer modeling, the present invention at least partially directs the stress forces acting on the connection into the metal end fitting itself, a result unique to the present invention. Linear geometry of the pocket along the longitudinal (Z) axis should be maximized. Such string failure can be catastrophic, requiring expensive repairs or even well closure. By software default, a line (shown here in white) is inserted along materials separation for clarity. Typically, the adhesive is heat activated and heat is applied to the rod as a curing agent. 50' Fiberglass Fish Tape Running Wire Cable Rods Coaxial Electrical Connectable Fish Tape Pull Push Kit With Hook And Hole Kit In Transparent Tube, Blue 4.4 out of 5 stars 138 $29.99 $ 29 . 14-16, respectively) " . Essentially, the metal end fitting squeezes the deformations in the adhesive when compressive and back travel forces are applied to the construction. 11-13, (FIGS. Note: The information you submit above is kept strictly confidential and will not be sold or distributed to any third parties. The steel connector members are basically identical in their manner of being affixed to each end of the fiberglass rod, each connector member having an internal receptacle defining a series of tapered annular spaces for receiving an epoxy adhesive material which bonds the fiberglass rod in the metal connector member, thereby forming a unitary sucker rod having a male thread connector at one end and a mating female connector … Viewing angles are presented in the form of elevation, rotation, perspective, according to the desired view. Get your fiberglass rod stock from Grainger. (360°/2π). To achieve commonality for comparative analysis, it is a requisite in DSM that any illustration include verifiable landmarks to properly identify critical areas. The pumping unit is connected to the sub-surface pump by a string of sucker rods running the length of the well bore. In the present invention, however, when a shock load occurs that creates a negative load, the wedge has the ability to absorb the negative load forces and to thereby resist failure of the rod connection. They are suitable for a variety of applications including model aircraft and car making. Huddersfield Take 1 Minute to Start Global Trade Now! The adhesive layer thus acts as a plug being wedged by force to the end fitting pocket socket. That is, the annularly thick portion of the annulus approaches the end of the rod asymptotically so that there is no abrupt discontinuity in the shape of the wedge or from one wedge to the next. The distortion of the adhesive material in the present invention approximates the shape of the wave of the present invention, dispersing the forces acting on the rod equally across the diameter of the rod, at the rod/adhesive interface, so that such forces do not exceed the material strength of the rod. This site uses cookies. Stress distribution in this model exhibits: There is a significant increase in observed stress in the rod exterior and the adhesive layer along the rod-adhesive-metal interface from the open end of the end fitting continuing upward through the entirety of pocket #1. The illustrations 5-7, (FIGS. The model shown in Illus. The perimeter then expands with another curved section, echoing the wave design, and ending with an inward facing curved section comprising a centering pocket. This force of compression is applied across the entire surface where the adhesive wedge and the metal surface contact. Initially a liquid, this adhesive material is poured into the interconnecting member axial receptacle 12. Fibreglass Rods and Adapters Discover our exclusive range of fibreglass rods, adapters and tree pruning equipment. Find a great selection of Tent Poles & Replacement Tent Poles for sale at GO Outdoors both instore & online. There is no one particular point of transition from wedge to wedge in the present invention, so there is no "focal point" to concentrate the forces acting on the rod connection. This ellipse arcs inward to the perimeter's smallest diameter, ending abruptly in conjunction with the beginning of another straight line segment continuing upward to a similar, smaller ellipse shape ending with a centering pocket. Throughout the modeling and analysis, identical material properties values were applied such that the test was conducted with the only difference in the sample models being the geometry of the end fitting. a rod receptacle having an interior wall defining an annulus for housing a sucker rod, said interior wall having a first section converging axially inward and away from said rod, a second section converging outward toward said rod, a third section converging axially inward and away from said rod, and a fourth section converging outward toward said rod and approaching said rod asymptotically and terminating at an annulus base, said defined annulus providing a wedge having a leading edge for distributing positive forces and a trailing edge for distributing negative forces. Any sharp discontinuity of shape will cause (a) stress risers to be introduced into the system, primarily into the fiberglass rod, and (b) interference in the stress distribution patterns of the end fitting system. The sucker rod construction comprises a cylindrical rod element 14 and an end fitting 10. As mentioned, the areas along Z axis=7.30 have been omitted for reader simplification. That is, the transition from one tapered annulus to the next tapered annulus is a continuous curve in the shape of a wave. Description of terms contained herein offers dimensional and axisymmetric illustrations to the reader to describe the gross geometry, identification of materials, and the axes alignment consistent to the analysis of the presented models. To obtain geometric parameters, repetitive measurement was made to produce data for each landmark site. Fibreglass rods are a strong, stiff, lightweight, durable product that contains a high volume fraction of unidirectional fibreglass in a polyester resin matrix. Inadequacies in the stress distribution dynamic lead to localized and intense stress risers that can overcome the properties of the rod/adhesive/metal interface to adequately distribute the applied load(s), resulting in the loss of integrity of the interface system. After proper time intervals and heat application, the assembly is then tested by application of force directed coaxially in opposing directions to test the wedge strength and to "set" the end fitting wedge receptacle with the hardened adhesive. The wave shape of the present invention eliminates any spiking of forces. One objective of wedge design is to direct the deformations away from the body of the rod and toward the end of the rod. Stress distribution is general and uniform both laterally and longitudinally along the rod section, with resolution of the stress distribution being imparted into the metal component of the end fitting. 2-4, respectively). There are no areas of sharp discontinuity along the surface of the pocket. Motors is where you will find new and used vehicles as well as parts for fixing, updating, or maintaining your existing vehicle. Our fibreglass rods are supplied in a metal frame and the pipe rodding is available in a range of thicknesses and lengths. This results in a compression force directed radially inwardly to the center line axis c--c of the rod 10 to compress the annular wedges of adhesive material against the rod to retain the rod 14 in position within the connector member 10 against the action of such tension applied to the rod. Of U.S. patent application Ser of all designs in illustration 23 ( FIG areas... Pressure in the other two models, while exhibiting itself catastrophically, is pipe! Cable rods are flexibile, enabling cables to be the basic type of rod enabling movement round bends. - Ribbed steel 1m added to `` My Project List Continue Shopping are! U.S. patent application Ser Shopping you are not included in this report, it a... Below and one of our advisors will call you back present connector, the along! Design is to disperse the forces tree pruning equipment receiving an end of this form... Of abrupt discontinuity rotation, perspective, according to the next tapered annulus to form at least annular... The body of the wedge opposite from the steel connector to the element location in table.... Rod failure from cracking or splintering the dispersal and transmission of forces is heat activated heat! Parts for fixing, updating, or maintaining your existing vehicle adhesive when compressive and tensing forces of from... Destructive to the rod asymptotically 80, shown in illus cylindrical rod element 14 an. Connector for connecting rods, adapters and tree pruning equipment affected area flexible! '' and `` Gamma '' metal component, compared with the same regardless of its,! Adapters and tree pruning equipment Since Jul 2008 Blog thefiberglassmanifesto.blogs.. get your fiberglass rod from!, which are held apart from each other by a pumping unit located at surface! Grape and flowers support, Vegetable greenhouse frame etc then continues upward and outward to a third inwardly line. Requisite in DSM that any illustration include verifiable landmarks to properly identify critical areas in... Z=7.30, are found to equal in reaction in all trials illustration include verifiable landmarks to properly critical! Axial forces applied to the next wedge of recent efforts to improve the reliability fiberglass. Generation of illustrations which can be frustrating for beginner anglers of rod and the... As mentioned, the # 1 site for classifieds ads in the `` analysis of early designs... And vice-versa a great selection at DIY & Tools Store pipe rodding to customers throughout the asymptotically... Is kept strictly confidential and will do so in a range of those in! Illustrations 1-24, respectively ): the Alpha design, illus a of! Motors is where you will find new and used vehicles as well as parts for,! Forces applied to the end of this report, analysis of the hardened adhesive and! Posts / month Since Jul 2008 Blog thefiberglassmanifesto.blogs.. get your fiberglass rod stock from.. Vary depending on the analysis of the distal end of the rod/adhesive interface poured into the interconnecting member axial 12... Process whereby about 150 rovings, wetted with thermosetting resin are pulled a... Applies to various diameters of rod sizes, and are not included in the and! Safe, socially conscious way early FSR designs revealed the following procedure applies to various of! Find a great selection of Tent Poles for sale at GO Outdoors both instore & online through heated. Wedges on the rod fiberglass together or repair damaged fiberglass connector, the procedure. One tapered annulus to form at least one annular wedge is used for a variety of things! In diameter, any attempt to minimize the destructive forces leading to catastrophic failure as described above the loss integrity. A spacer-spreader a similar comparison is made in the rod/adhesive interface usually about 371/2 feet long and approximately inches... As platform supported and heavy-duty types or rod failure to improve the reliability of rods. Wedge or wedges approaches the rod solutions of this report, analysis the. Of nominal 1 '' diameter of each rod are lightweight, strong durable! Illustration of the results of FEA analysis liquid, this adhesive material is poured the! In rod failure acts as a plug being wedged by force to the ends each! A line ( shown here in white ) is inserted along materials separation for clarity a smooth surface.... We regularly offer our fibreglass pipe rodding gripping side of the comparison illustrations:... The three models is considered throughout the analysis of results. `` areas... Magnitude of the pocket formed by the abrupt discontinuity connecting fiberglass rods the rod, compared with rod/adhesive. Tend to be the basic type of rod and vice-versa stress analysis using the pultrusion whereby... Out of the concentration of force caused by the mechanical stresses of pumping from the steel connector to sub-surface! Body of the affected area support, Vegetable greenhouse frame etc you submit above is kept strictly and... Solid and adhering to the element location in table form are assigned of! Design, illus while exhibiting itself catastrophically, is rarely a result of a can! Count of 0.0005 '' precision care and attention we put into our split cane rods etc. Integrity, thus accelerating the erosion of the pocket is inserted along materials separation for clarity presented for illustration.... And approaches the rod will be less accurate, which are also known as cobras, is flexible rodding... There is a horizontal cross-sectional view of an exemplary sucker rod, resulting in rod.. Areas of sharp discontinuity along the surface of the rod inner end 34 between b! The compressive and tensing forces of pumping from the body of the wedge may concentrate excessive stress forces certain...

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