Open AccessA unified and explicit approach for accurately characterizing the hardening-softening behavior of metals with a tension-compression strength asymmetry
Author(s) -
Huifeng Xi,
Lin Zhan,
S. Y. Wang,
Zihan Xu,
Heng Xiao
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/770/1/012110
Subject(s) - softening , asymmetry , parametric statistics , hardening (computing) , strain hardening exponent , materials science , compression (physics) , tension (geology) , structural engineering , work (physics) , limiting , mechanics , mathematics , composite material , physics , engineering , mechanical engineering , thermodynamics , statistics , layer (electronics) , quantum mechanics
A unified and explicit approach is proposed for accurately characterizing a complex hardening-softening behavior of metals with a tension-compression strength asymmetry. The proposed approach provides an explicit determining of the yield strength as plastic work function and contains the following three procedures: (i) a mode invariant is introduced to express the yield strength as a sum of two uncoupled parts for the tension and the compression case; (ii) a new expression for the plastic work is derived explicitly in terms of the uniaxial stress-strain function and, then, the yield strength function can be determined jointly from the just-mentioned two functions with the axial strain as parametric variable; and, finally, (iii) the axial stress-strain function is presented for representing the hardening-softening features. With these procedures, test data over the entire hardening-softening range can be fitted independently for the tension and the compression cases by directly treating the uniaxial stress-strain function. As such, tedious trial-and-error procedures are bypassed in identifying numerous unknown parameters. Numerical examples show that accurate simulations may be achieved with the proposed approach.