Nonlinear finite element analysis of equivalent Iwan model considering threaded connections

Area of Science:

• Mechanical Engineering
• Materials Science
• Computational Mechanics

Background:

• Threaded connections exhibit complex geometric nonlinearity and contact behavior.
• Accurate modeling of these behaviors is crucial for structural integrity and performance.

Purpose of the Study:

• To develop a novel finite element model equivalent to the Iwan model for analyzing nonlinear contact in threaded connections.
• To investigate the relationship between applied torque and preload force.
• To explore the influence of friction and rotational amplitude on mechanical response.

Main Methods:

• Construction of a finite element model using Abaqus software.
• Development of a subroutine based on the Iwan model to simulate nonlinear contact.
• Verification of model accuracy and nonlinearity against theoretical results.

Main Results:

• The Iwan model-based finite element model accurately captures complex contact behavior in threaded joints.
• Increasing the friction coefficient enhances preload force but elevates stress concentration and deformation risks.
• Increased rotational amplitude boosts preload force, potentially causing plastic deformation and higher stress concentration.

Conclusions:

• The developed finite element model provides a robust tool for analyzing threaded connections.
• Friction and rotational amplitude significantly influence the mechanical response and safety of threaded joints.
• The study offers new insights into deformation and stress concentration risks not sufficiently addressed previously.