A Model-inspired Phenomenology Constitutive Equation for the Temperature-dependence of Flow Stress at Confined Dimension II

2014 International Conference on Manufacturing, Optimization, Industrial and Material Engineering

Duryat, Rahmat Saptono^1,2 ; Kim, Choong-Un^1

Materials Science and Engineering Department, UT Arlington, Arlington, TX, United States^1

Departemen Teknik Metalurgi Dan Material Universitas Indonesia, Depok, Indonesia^2

关键词: Controlled process;    Figures of merits;    Flow mechanisms;    Model equations;    Moderate temperature;    Phenomenological approach;    Temperature dependence;    Thermally activated;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/58/1/012021/pdf
DOI  :  10.1088/1757-899X/58/1/012021

来源: IOP

【 摘 要 】

This paper presents further development of the constitutive equations based on model-inspired phenomenological approach. In our previous approach, three figures of merit functions were examined to study the temperature-dependence of yield stress and found two model equations that may work especially well for the small volume materials in the moderate temperature ranges (25). We have investigated the underlying assumptions behind each model to substantiate their physical correctness. We examined the parameters in each models using the frame of flow stress being dislocation-mediated, thermally activated, and obstacle-controlled process. These examinations led us to find refined model equations with parameters that can be related to the characteristics of flow mechanisms.