Consistent tangent stiffness of a three-dimensional wheel-rail interaction element. (English) Zbl 1535.74566
Summary: Consistent tangent stiffness plays a crucial role in delivering a quadratic rate of convergence when using Newton’s method in solving nonlinear equations of motion. In this paper, consistent tangent stiffness is derived for a three-dimensional (3D) wheel-rail interaction element (WRI element for short) originally developed by the authors and co-workers. The algorithm has been implemented in finite element (FE) software framework (OpenSees in this paper) and proven to be effective. Application examples of wheelset and light rail vehicle are provided to validate the consistent tangent stiffness. The quadratic convergence rate is verified. The speeds of calculation are compared between the use of consistent tangent stiffness and the tangent by perturbation method. The results demonstrate the improved computational efficiency of WRI element when consistent tangent stiffness is used.
MSC:
| 74M15 | Contact in solid mechanics |
Keywords:
consistent tangent stiffness; wheel-rail interaction; vehicle-track systems; quadratic convergence rate; Newton-Raphson algorithm; finite element methodSoftware:
OpenSeesReferences:
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