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Modelling of cyclic deformation behaviour of railway disc brakes under thermomechanical loading
Author(s) -
Zhang Le,
Ma Songyun,
Markert Bernd
Publication year - 2017
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201710215
Subject(s) - viscoplasticity , finite element method , constitutive equation , materials science , hardening (computing) , nonlinear system , subroutine , isotropy , mechanics , structural engineering , composite material , engineering , computer science , physics , layer (electronics) , quantum mechanics , operating system
Metallic materials of railway disc brakes exhibit viscoplastic deformation behaviour under cyclic thermomechanical loadings. In this study, a viscoplastic Chaboche model is applied to describe the inelastic deformation behaviour in the braking process incorporating the inhomogeneous variation of temperature. The rate‐dependent hardening behaviour of 28CrMoV5‐8 steel is modelled by employing combined nonlinear isotropic and kinematic hardening rules. Furthermore, a numerical integration algorithms of the constitutive model is developed by using the implicit backward Euler method. The constructed nonlinear algebraic equations are solved by coupling the improved Pegasus method [4] and Newton method. The proposed model is implemented in the finite element code ABAQUS via a user‐defined material subroutine (UMAT). Finally, finite element simulations including sliding friction and heat transfer between disc and pads are performed for the case of an emergency braking. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)