Research Progress on Strain Rate Effect and Dynamic Constitutive of Metals

doi:10.3901/JME.2024.02.081

Abstract

Abstract: Most metals have complex strain rate effects. The yield strength and flow stress have different values at different strain rates, and the stress variation trend will be different at different strain rates, which is manifested as the strain rate strengthening effect and strain rate weakening effect. The strain rate affects the macroscopic mechanical properties and internal microstructure of metal materials, and there are obvious differences in the plastic deformation behavior of metal materials under different deformation rates. In the process of high-speed cold forming such as high-speed drawing of the plate, the increase of the local strain rate of the material will lead to an instantaneous temperature rise, and the local high temperature and high pressure will affect the drawing forming performance and surface quality of the material to varying degrees. In the field of high-speed sheet metal forming, establishing a dynamic constitutive model that considers the strain rate effect and adiabatic temperature rise effect is an important prerequisite for accurately obtaining the mechanical behavior response of materials and realizing high-precision forming with integrated formability. Firstly, the metal strain rate effect, as well as the effect of strain rate on the plastic deformation behavior of metals are introduced, furthermore, the research progress of metal dynamic mechanical behavior and dynamic constitutive model is summarized, and the strain rate effect on flow stress, as well as the research work of phenomenological constitutive, physical constitutive and artificial neural network constitutive models is also discussed and analyzed, finally, the deficiencies in the research of metal strain rate effect and the construction of dynamic constitutive relationship of metal high-speed forming are summarized and discussed. Some suggestions and prospects are given for the research work related to the dynamic constitutive of metal high-speed forming.

Key words: strain rate effect, high speed forming, adiabatic temperature rise, dynamic mechanical behavior, dynamic constitutive model

CLC Number:

TG156

XU Teng, DENG Chunyang, RAN Jiaqi, GONG Feng, TANG Heng. Research Progress on Strain Rate Effect and Dynamic Constitutive of Metals[J]. Journal of Mechanical Engineering, 2024, 60(2): 81-98.

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