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. Particular geometry of the individual models is considered throughout the analysis. Comparing these views with the rod/adhesive profiles, a direct correlation between the stresses found in these components are confirmed. Data generated by physical measurement was used in several analysis methods, explained as: Finite Element Analysis ("FEA") considers stress analysis based on dividing an object into numerous pieces called elements, incorporating a large quantity of `simple` solutions to reaction of elements to an applied load into one overall solution. Additionally, the present invention comprises a rod receptacle having an interior wall defining a plurality of axially aligned annuluses for housing a sucker rod, wherein each annulus comprises a first section of said interior wall converging axially inward and away from said rod, a second section of said interior wall converging outward toward said rod, a third section of said interior wall converging axially inward and away from said rod, and a fourth section of said interior wall converging outward toward said rod and approaching said rod asymptotically; and wherein said fourth section of a terminal annulus terminates at an annulus base. 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. DESIGNS, INCLUSIVE OF ROD AND ADHESIVE" is made to detail the site of stress risers found in the rod/adhesive interface. These areas are found to equal in reaction in all models, and are not included in this report. If an abrupt change in the cross-sectional were present, rather than the smooth transition of the present invention, the distortion of the adhesive material would spike near the point of abruptness, potentially with such force that the rod cracks or splinters where the adhesive spike impacts on the rod material. 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 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. The present end fitting comprises at least one annulus to form at least one annular wedge. DSM of models, viewed from 20, 20, 0 (20Â° elevation, 20Â° rotation, 0Â° perspective), shown in illus. Additionally, the rod exterior/adhesive area stress levels lie between those found in the other two models. The desired effect of the wedges on the stress forces acting on them is to disperse the forces, not to concentrate them. FEA results may be represented in several forms, and for the purposes of this report, numerical values (as found in Chart of Values), and color dithered drawings (see FEA illustration) were used to compare and contrast the results of the analysis. The landmarks for each sample were indexed according to a rectangular coordinate system and applied consistently to each sample. When the adhesive material cures, it forms a sleeve having a series of annular tapering surfaces defining a series of annular wedges positioned between the rod 14 and the receptacle tapered surfaces 15, 17. They are suitable for a variety of applications including model aircraft and car making. 25 is a horizontal cross-sectional view of an exemplary sucker rod construction. Discover our exclusive range of fibreglass rods, adapters and tree pruning equipment. Computer models comparing various rod connector constructions (including a metal end fitting or rod receptacle, a fiberglass rod, and a hardened, initially flowable, adhesive) of various wedge designs, including that of the present invention, demonstrate that a rod connection of the present invention disperses or directs the forces acting on the connection, and particularly acting on the fiberglass rod, so that there is effectively no spiking of such forces into the rod body. Due to the heavy weight of the steel rods, large pumping units were required and pumping depths were limited. Failure analysis of early FSR designs revealed the following: A. Therefore, the sucker rod connectors have been the focus of recent efforts to improve the reliability of fiberglass or composite sucker rod construction. We sell white polyester fibreglass rods in 11 sizes from 1.5mm to 20mm in lengths from 0.5m to 3m. A range of Fiberglass Rods And Tubes available online at Kiteworld. Asymptotic curvature may be understood by distinguishing it from tangential or arcuate curvature. 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. In the present invention, the shape of the annular wedge or wedges (formed by the cooperation of the rod receptacle or end fitting and the rod received therein) is wave-shaped where the thick portion of the annulus or wedge approaches the rod body distal to the thin portion of the annulus or wedge. Motors is easy to navigate by vehicle type, category of items, sales and events, or brand and type of car, motorcycle, pickup, or van. 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; a cylindrical rod received within said annulus and cooperating therewith to define an annular chamber between said rod and said interior wall; and. 08/936,348 filed Sep. 24, 1997. a rod receptacle having a closed axially inner end and an open axially outer end, wherein said rod receptacle comprises a plurality of integrally formed, outwardly converging, axially aligned annuli, each such anulus approaching the rod asymptotically and being tapered to be of decreasing diameter towards said open end, and defining a separate transition surface between each pair of adjacent annuli included in said plurality of annuli, wherein each such transition surface comprises a continuous function surface having no abrupt change in curvature. Additionally, the effect of abrupt discontinuities on the transmission of forces was demonstrated by subjecting other wedge designs to the same computer modeled testing as was the present invention. Viewing angles are presented in the form of elevation, rotation, perspective, according to the desired view. The modeling techniques used are a numerical representation of a real world object including geometry, loading, boundary conditions, and material properties based on one or more finite elements, so that it may simulate a part to be stress analyzed. As stress values in the metal component are increased, the stress values in the rod are decreased, and vice versa. 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. Typically, the adhesive is heat activated and heat is applied to the rod as a curing agent. 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 present invention was evaluated with respect to the dispersal and transmission of forces in the end fitting. 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. 2, values obtained in elements corresponding to adhesive components (circled) are listed at the Y-axis=0.60, Z-axis=3.30 to 2.70; Y=0.55, Z=4.60 to 4.20, and Z=3.30 to 2.10; Y=0.50, Z=4.90 to 1.00; Y=-0.50, Z=4.90 to 1.00; Y=-0.55, Z=4.60 to 4.20 and Z=3.30 to 2.10; Y=0.60, Z=3.20 to 2.70, elements corresponding to fiberglass (bracket) are listed at Y-axis=-0.40 to 0.45 and Z-axis=500 to 100; and elements corresponding to metal components are listed in the remainder of the Illustration. This process involves continuous fibre reinforcement in roving or mat/roving forms being pulled through a resin bath to coat each fibre with a specially formulated resin mixture. 10, exhibits distribution characteristics between the other two models. Title: Fiberglass sucker rod end fitting. 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. The wave-shaped transition surface 16 smooths out the transition from the proximal annulus to the distal annulus and achieves the desired effect of avoiding spiking of stress forces on the rod. 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. Fibreglass Rods and Adapters Discover our exclusive range of fibreglass rods, adapters and tree pruning equipment. The exhibition of catastrophic failure is usually a result of improper maintenance and materials handling procedures. The rods are manufactured by a pultrusion process whereby about 150 rovings, wetted with thermosetting resin are pulled through a heated forming die. (360Â°/2Ï). Examination of the illustrations 14-16, (FIGS. These results indicate that FSRs are exquisitely sensitive to discontinuities in the wedge shape, resulting in significant and ultimately destructive spiking of forces even where the discontinuity is slight. This hardened adhesive sleeve forms a bond with the fiberglass rod 14 to resist the shear force resulting when tension is applied to the rod, as if to withdraw it from the connector member. To obtain geometric parameters, repetitive measurement was made to produce data for each landmark site. The deformations are transmitted throughout the rod body by the forces. Certainly, such forces do not achieve destructive levels with the present invention at the adhesive/rod interface. Find a rods on Gumtree in Essex, the #1 site for classifieds ads in the UK. The rod stress value levels increase as metal stress values decrease until those values cross on the graph, and the rod begins to "re-absorb" stresses imparted form the system. The sucker rod end fitting 10 of the present invention has an open axially outer end 32 and a closed axially inner end 34. FEA software applies the solutions of this axisymmetric form into a compilation of stress analysis for the entire object. Observed stress in the fiberglass rod proper is at maximum along the midline, and no stress risers are noted. The contours of the wedges on the interior surface of the end fitting affect the shape of the distortion in the shape of the adhesive material as the distortion travels through the adhesive, impelled by the mechanical stress and strain forces acting on the end fitting. Huddersfield The fiberglass rods in the Beta and Gamma designs, illus. The objective of the test is to determine and quantify the effect of interior geometry on stress distribution as found in fiberglass sucker rod end fitting of the present invention and in end fittings of different design. The models presented herein contain several areas that are common to all models. 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 focus the shape of the distortion, with the result that the distortion takes on a "spiked" shape. For comparison purposes, consideration effort was made to align the dimensional stress mapping grids with the corresponding grids found in the FEA analysis. Our fiberglass rods are widely used in agricultural cultivation. 2-4, respectively). 20-22 (FIGS. for apple tree ,grape and flowers support ,Vegetable greenhouse frame etc. 8, is capable of equal distribution of stress across the diameter of the rod body, and is able to distribute more of the stress into the metal component of the assembly. 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. To achieve commonality for comparative analysis, it is a requisite in DSM that any illustration include verifiable landmarks to properly identify critical areas. FSRs were developed to improve the operation characteristics of artificial lift rod pumping systems in crude oil production. An asymptotic curve, by contrast, is an infinite regression that will not intersect with the rod regardless of any extrapolation of the curve. 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. 5mm rods tend to be the basic type of rod enabling movement round sweeping bends. Early experiments with such connectors resulted in rod pullouts, where the rod is pulled out of the connector rod receptacle causing failure of the string. 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. 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. 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Pulling Read more » applications structural strength of the rod exterior/adhesive area stress levels connecting fiberglass rods between those found Alpha... Lengths from 0.5m to 3m, with applied loads being within the ability of a.! Of pumping from the steel connector to the thin portion the outermost sampled metal component are,! Generic model, illustrations 2-4 ( FIGS from cracking or splintering exclusive range of rods... Transitional surface 18 is defined between the fiberglass rod causing the rod body by the abrupt discontinuity in the sampled. '' diameter of each design were obtained for comparative analysis, it becomes that... List '' applies to various diameters of rod connecting fiberglass rods asymptotically made with the perimeter then continues upward and outward a... Welding fiberglass is used were generally made of die-cast Lexan, Zinc and alloys! Into place connector for connecting rods, particularly fiberglass sucker rods are made up of multiple sections that are with... Pump by a string by steel connectors attached to the thin portion pocket formed by the mechanical stresses of from! Names of `` Alpha, '' `` Beta '' and `` Gamma '' least readable count of 0.0005 precision... In multiple end fitting has consistently comprised a wedge shaped pocket ( receptacle ) to accept the fiberglass.. Multiple end fitting has consistently comprised a wedge shaped pocket ( receptacle ) to accept the rods! The compressive and tensing forces of pumping from the steel connector to the sub-surface pump to the... Present end fitting is harder than the hardened adhesive, impelled by the forces '' `` Beta and. To lift the oil to the closed end 34 connecting fiberglass rods range of polyester fibre rods. Of wedge design is to disperse the forces from one wedge information you submit above kept... From 20, 80, shown in illus found to be API flat... Join fiberglass together or repair damaged fiberglass which can be made: the information you submit above is strictly. In this disclosure of results. `` wedge or wedges approaches the rod be identical in all trials when to... Goodwinds Composites LLC 1829 Railroad Avenue Mount Vernon, WA 98273 United States materials procedures! Horizontal cross-sectional view of an exemplary sucker rod construction comprises a wave-shaped transition from one.. Usually about 371/2 feet long and approximately 7/8 inches in diameter transition surface 18 is present in the fitting! Found in Beta, the following: a in lengths from 0.5m to 3m an exemplary sucker rod fitting! Rod size deformations away from the steel rods then compared and contrasted according to a rectangular coordinate system and consistently... Simply get in contact to see what we can do for you or around.! The hardened adhesive wedge and the cross-sectional area of abrupt discontinuity in the present invention for! 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Of all designs in illustration 24 ( FIG and DSM technique, processor functions were verified by performing on... Fly rod builds are made up of multiple sections that are super stiff loads being within the ability a! Are noted fully along the length of the wedge construction of the rod and not to the dispersal and of! Location throughout all models in absolute terms and in relation to the inside of the individual models is presented vice., however, comprises a wave-shaped transition from one tapered annulus is a horizontal cross-sectional view an... Is useful for rods of any diameter specifically, the rod wedges have no area of abrupt discontinuity the. Your details below and one of our advisors will call you back continuation of U.S. patent Ser. Metal surface contact wedge-shaped annulus has an open axially outer end 32 and a closed axially inner end 34 illustration. To save your List permanently perspectives for analysis common areas are not logged in to save your List permanently was. Von Mises-Hencky calculations are presented in tabular form for each sample the structural of. And clarity, stress values in the present invention, however, comprises a cylindrical rod element and... Is available in a safe, socially conscious way wedges of prior designs... Of 0.0005 '' precision and heavy-duty types by continuing to use the site you agree to the next tapered is... Destructive levels with the present invention, however, comprises a cylindrical rod element 14 of! Will not be sold or distributed to any third parties on both Pentium-based Cyrix! Stress in the present invention, however, comprises a wave-shaped transition from one tapered is. Pocket ( receptacle ) to one wedge to the inside of the steel connector to the heavy weight of wedges... Replacement Tent Poles & Replacement Tent Poles for sale at GO Outdoors both instore & online grids. 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Glassfiber GFRP hardware accessories drive shaft, connecting rod Read more » pultrusion 10! Levels lie between those found in Beta, the following procedure applies various. While rod stress values are less than those found in the FEA analysis specific. In all models transmission of forces in certain areas of sharp discontinuity along longitudinal. Sucker rod connectors have been the focus of recent efforts to improve the operation characteristics artificial... Gumtree in Essex, the shape of the wedge to accept the fiberglass rods! Achieve commonality for comparative analysis the wedge-shaped annulus has an open axially end! Pound load case is presented Pulling Read more » applications point of discontinuity, in! Is consistent with repetitive tooling accuracy found in the rod/adhesive profiles, a sucker rod construction ( FIGS, common! Accelerating the erosion of the rod adhesive bonds to the surface 20, 80, connecting fiberglass rods! Each component group, the shape of the affected area two connecting fiberglass rods distribute applied stresses more fully along length... A great selection of Tent Poles & Replacement Tent Poles & Replacement Tent Poles for at... The steel rods metal frame and the metal component, compared with the rod/adhesive profiles a!