TY  - EJOU
AU  - Dieng, L.  
AU  - Abdul-Latif, A.  
AU  - Haboussi, M.  
AU  - Cunat, C.  

TI  - Cyclic Softening Modeling with the Distribution of Non Linear Relaxation (Dnlr) Approach
T2  - Computers, Materials \& Continua

PY  - 2007
VL  - 6
IS  - 1
SN  - 1546-2226

AB  - Being of particular interest in this work, a complicated phenomenon related to cyclic softening of metallic polycrystals is modeled. As in the Waspaloy, this phenomenon can take place when a non-proportional tension-torsion cyclic loading of  90° out-of-phase is followed, after cyclic steady state, by a uniaxial one (tension-compression) with the same maximum equivalent plastic strain. By using the DNLR (Distribution of Non Linear Relaxation) model recently proposed by the authors describing the cyclic plasticity of metals, a new extension is here developed. It is recognized that such an extension can satisfactorily reproduce this softening phenomenon. It is noteworthy that this model describes such a phenomenon with a minimum number of material parameters in comparison with other phenomenological models. After calibration of the model parameters for the Waspaloy, the constitutive equations of the model are then implemented in a commercial finite element code to simulate the model response vis-à-vis a given structure made from the Waspaloy. Finally, it is found that the new extension as well as the finite element predictions give a fairly well accordance with the available experimental results.
KW  - DNLR
KW  -  Cyclic Plasticity
KW  -  Relaxation
KW  -  Complex Loading
KW  -  Cyclic Softening
KW  -  Finite Element Predictions

DO  - 10.3970/cmc.2007.006.021