Premium
Simulation of asymmetric effects for shape memory alloys
Author(s) -
Wilmanns Stefan,
Mahnken Rolf
Publication year - 2007
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200700591
Subject(s) - shape memory alloy , martensite , materials science , hardening (computing) , compression (physics) , weighting , plasticity , tension (geology) , shear (geology) , diffusionless transformation , constitutive equation , uniaxial tension , stress (linguistics) , mechanics , thermodynamics , metallurgy , composite material , physics , ultimate tensile strength , microstructure , finite element method , layer (electronics) , acoustics , linguistics , philosophy
Experimental results of shape memory alloys show a pronounced asymmetric behaviour between tension, compression and shear. For simulation of these effects in the constitutive equations different transformation strain tensors are introduced. These are related to the different variants for the multi‐variant‐ and detwinned‐martensite as a consequence of different stress states. In the framework of plasticity the concept of stress mode dependent weighting functions is applied in order to characterize the different stress states. Verification of the proposed methodology is succeeded for simulation of the pseudoelastic behaviour of shape memory alloys with different hardening characteristics in tension, compression and shear. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)