Investigation of the features of polycrystals complex loading using a two-level crystal plasticity theory

International Scientific Conference of Young Scientists: Advanced Materials in Construction and Engineering

材料科学;土木建筑工程;工业技术

Volegov, P.S.^1 ; Trusov, P.V.^1 ; Gribov, D.S.^1

Perm National Research Polytechnic University, Department of Mathematical Modeling of Systems and Processes, Perm

614990, Russia^1

关键词: Additional cyclic hardenings;    Crystal plasticity theory;    Cyclic deformations;    Inelastic deformation;    Numerical experiments;    Physical analysis;    Station-ary values;    Vector properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/71/1/012071/pdf
DOI  :  10.1088/1757-899X/71/1/012071

来源: IOP

【 摘 要 】

The article considers a two-level mathematical model of inelastic deformation of metal polycrystals taking into account evolution of the structure. The structure of the model was considered, some special features of its application to describe the intensity of inelastic deformations were marked. The need for a careful physical analysis of the hardening laws construction was highlighted. To evaluate the applicability of multi-level models to describe the known experimental effects of cyclic deformation a number of results of field experiments on the complex proportional and disproportional cyclic deformation was considered, some specific effects that appear in these processes were identified: stresses amplitude output at the stationary value; additional cyclic hardening at a disproportionate loading, which magnitude depends on the so-called degree of disproportionality. Numerical experiments on the disproportionate cyclic loading were carried out, the possibility of modified hardening laws to describe access to the stationary values of the stress intensity was noted, and also the possibility of a qualitative description of the effect of additional cyclic hardening was demonstrated. The A.A. Ilyushin hypothesis by isotropy and the principle of vector properties delay at the turn of the deformation path were validated.