Мodeling of adhesive-press joint of fiberglass rod with steel shell
DOI:
https://doi.org/10.33216/1998-7927-2024-286-6-156-165Keywords:
fiberglass, sucker rod, strength, finite element analysis, optimizationAbstract
For the full use of polymer composite materials (PCM), it is necessary to create reliable PCM/metal joints. The creation of such joints is a complex scientific and technical problem, also associated with the orthotropic nature of PCM. A review of the most promising methods for creating such connections (mechanical, adhesive, welded and others) has been conducted. A new design of an adhesive-press joint of a fiberglass rod with a steel shell has been developed, which is used in sucker rods for oil production. The connection is formed by screwing an undamaged, unthreaded rod into a threaded steel nipple that has a wedge-shaped profile and is filled with liquid adhesive. This creates a press fit, and the polymerization of the adhesive provides additional strength due to a system of wedges that hold the rod during tension. The design combines the advantages of adhesive, press and threaded joints. To study the strength and optimization of the joint, a parametric finite element model with two simulation steps has been developed. In the first step, the formation of a tension fit and the polymerization of the adhesive are simulated and the maximum equivalent stresses in the rod are recorded. In the second step, the axial deformation of the joint is simulated by gradually moving the rod end by a distance of 5 mm. In this step, the failure moment at which the axial stresses in the rod reach their maximum value is recorded. The dependences of the maximum equivalent stresses in the rod of the finished joint and the axial stress in the rod at the moment of failure on the joint parameters have been obtained. The dependences can be used to select the optimal values of the parameters and are the basis for the manufacture of experimental samples of the joints. For an allowable equivalent stress in the rod of the finished connection of 150 MPa, the optimal parameters are the inner radius of the nipple of 10.5 mm, the wedge adhesive pitch of 33 mm, the length of the cylindrical (press) part of 13 mm. This ensures the strength of the connection within 430 MPa. The developed parametric finite element model can be used to study the strength and optimization of connections of this type.
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