scholarly journals Material characterization and fracture prediction with advanced constitutive model and Polar EPS fracture diagram for AA 3104-H19

2018 ◽  
Vol 1063 ◽  
pp. 012156
Author(s):  
Robert E Dick ◽  
Yanshan Lou ◽  
Shunying Zhang ◽  
Jeong Whan Yoon
Keyword(s):  
Constitutive Model ◽  
Material Characterization ◽  
Fracture Prediction ◽  
Fracture Diagram

scholarly journals Characterization of the Elastoplastic Response of Low Zn-Cu-Ti Alloy Sheets Using the CPB-06 Criterion

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3072
Author(s):  
Alister ◽  
Celentano ◽  
Signorelli ◽  
Bouchard ◽  
Pino ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Material Characterization ◽  
Yield Function ◽  
Alloy Sheet ◽  
Material Behavior ◽  
Bulge Test ◽  
Ti Alloy ◽  
Elastoplastic Behavior ◽  
Zinc Alloys ◽  
Hardening Law

Unlike other HCP metals such as titanium and magnesium, the behavior of zinc alloys has only been modeled in the literature. For the low Zn-Cu-Ti alloy sheet studied in this work, the anisotropy is clearly seen on the stress-strain curves and Lankford coefficients. These features impose a rigorous characterization and an adequate selection of the constitutive model to obtain an accurate representation of the material behavior in metal forming simulations. To describe the elastoplastic behavior of the alloy, this paper focuses on the material characterization through the application of the advanced Cazacu-Plunket-Barlat 2006 (CPB-06 for short) yield function combined with the well-known Hollomon hardening law. To this end, a two-stage methodology is proposed. Firstly, the material characterization is performed via tensile test measurements on sheet samples cut along the rolling, diagonal and transverse directions in order to fit the parameters involved in the associate CPB-06/Hollomon constitutive model. Secondly, these material parameters are assessed and validated in the simulation of the bulge test using different dies. The results obtained with the CPB-06/Hollomon model show a good agreement with the experimental data reported in the literature. Therefore, it is concluded that this model represents a consistent approach to estimate the behavior of Zn-Cu-Ti sheets under different forming conditions.

Characterization and Simulation of Mechanical Behavior of 6063 Aluminum Alloy Thin-Walled Tubes

2011 ◽  
Vol 197-198 ◽  
pp. 1500-1508 ◽  
Author(s):  
Hao Zhu ◽  
Cha Qin ◽  
Jian Qiang Wang ◽  
Fang Juan Qi
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Model ◽  
Material Characterization ◽  
Fem Simulation ◽  
Stress Triaxiality ◽  
Tensile Tests ◽  
Strain Rates ◽  
Engineering Strain ◽  
6063 Aluminum Alloy ◽  
Thin Walled

The material characterization and mechanical behaviors of aluminum alloy (6063) were investigated using flat specimens and the butterfly specimens with a modified Arcan fixture. The butterfly specimens were tensile-loaded at various stress triaxiality by changing the loading angles of the Arcan fixture. The flat specimens were tensile-loaded at various strain rates. The results of tensile tests at various stress triaxiality showed that the curves of engineering stress-engineering strain are obviously different. The results of different strain rates tensile tests showed that the yield stress and fracture stress increased slightly with strain rates increasing, however the fracture strain decreased obviously with strain rates increasing, and the ultimate strength almost remained constant. The Johnson-cook constitutive model could be used to describe the dynamic axial crashing behavior of thin-walled 6063 aluminum alloy tubes under impact loading. The material constants of the Johnson-cook constitutive model and failure model were acquired to be used for FEM simulation through material characterization.

IMPLICATIONS OF A CONSTITUTIVE MODEL FOR STRAIN LOCALIZATION

1988 ◽  
Vol 49 (C3) ◽  
pp. C3-489-C3-496
Author(s):  
B. D. COLEMAN ◽  
M. L. HODGDON
Keyword(s):  
Constitutive Model ◽  
Strain Localization
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