Theoretical prediction of temperature dependent yield strength for metallic materials

Based on a kind of equivalence between heat energy and distortional strain energy, it is assumed that there is a constant maximum which includes both the distortional strain energy and the corresponding equivalent heat energy associated with material yield. A temperature dependent yield strength model is then developed for metallic materials. The model establishes the quantitative relationship of the yield strength, temperature, elastic modulus, the specific heat capacity at constant pressure and Poisson's ratio. The comparisons between the model and experiments are made, and the agreement between theory and experiment is striking. It is noteworthy that this model has no fitting parameters. The strength of the model is its generality and ability to easily predict the temperature dependent yield strength at arbitrary temperatures. (c) 2015 Elsevier Ltd. All rights reserved.National Natural Science Foundation of China [11172336, 11472066]; Program for New Century Excellent Talents in University [ncet-13-0634]; State Key Lab for Strength and Vibration of Mechanical Structures of Xi'an Jiaotong University [SV2014-KF-15]; Chongqing Graduate Student Research Innovation Project [CYB14030]SCI(E)EIARTICLEwgli@cqu.edu.cn273-27810