ZHANG Jing, WANG Zhe. A three-surface cyclic constitutive model and comparison between experimental and numerical results[J]. 2017, 49(6): 2017-6.
DOI:
ZHANG Jing, WANG Zhe. A three-surface cyclic constitutive model and comparison between experimental and numerical results[J]. 2017, 49(6): 2017-6.DOI: 10.11918/j.issn.0367-6234.201607017.
A three-surface cyclic constitutive model and comparison between experimental and numerical results
Based on the theories of bounding surface and multiple surface
a three-surface cyclic constitutive model
which is applicable for engineering because of the simple form and less parameters
was established to describe metal material behavior under the triaxial cyclic loadings. The plastic strain was decomposed into plastic strain 1 corresponding to a bounding surface model and plastic strain 2 corresponding to a single yield surface model. An evolution formula of the distance between the current stress and the image stress on the bounding surface was developed
which makes the plastic modulus calculation be coupled with the kinematic hardening rule through the consistency condition of the yield surface. As the hardening parameter
the plastic strain was calculated according to the associated flow rule. Compared with the classic bounding surface models
it has a concise form
and compared with the modified kinematic hardening rule models
it has less parameters. The existing experimental results about stable metal material U71Mn under uniaxial cyclic loading were adopted
and four mechanical behaviors were considered. The ratcheting were simulated by the model considering the effect of mean stress and stress amplitude under asymmetrical stress cycling
and the maximum strain amplitude memory effect was analyzed under symmetrical strain cycling. The calculated results agree well with the experimental results
which means the proposed model provides a new method to study the constitutive relation.