scholarly journals Identification of nonlinear kinematic hardening constitutive model parameters using the virtual fields method for advanced high strength steels

2016 ◽  
Vol 102-103 ◽  
pp. 30-43 ◽  
Author(s):  
Jiawei Fu ◽  
Frédéric Barlat ◽  
Jin-Hwan Kim ◽  
Fabrice Pierron
Keyword(s):  
Constitutive Model ◽  
Kinematic Hardening ◽  
High Strength Steels ◽  
High Strength ◽  
Model Parameters ◽  
Virtual Fields Method ◽  
Advanced High Strength Steels

Evaluation and Validation of Methods to Determine Limit Strain States with Focus on Modeling Ductile Fracture

2014 ◽  
Vol 622-623 ◽  
pp. 265-272
Author(s):  
Andreas Sabathil ◽  
Ingo Heinle ◽  
A. Lipp ◽  
J. Meinhardt ◽  
M. Merklein
Keyword(s):  
Ductile Fracture ◽  
Sheet Metal ◽  
High Strength Steels ◽  
High Strength ◽  
Limit Strain ◽  
Model Parameters ◽  
Element Analysis ◽  
Advanced High Strength Steels ◽  
Validation Experiment ◽  
Body In White

In the manufacturing process of body in white components made from sheet metal it is state of the art to accompany the process by means of finite element analysis. A main criterion for determining a feasible tool design and production process parameters is the prediction of material failure, which can be categorized in instability and ductile fracture. The ductile fracture failure mode is more likely to occur, as more advanced high strength steels and aluminum alloys are used for body in white components. Therefore different approaches have been presented to model ductile fracture over the past years. This task is more challenging when the material is exposed to arbitrary loading paths that can occur in deep drawing processes. However there is no guideline for sheet metal forming applications to determine which models for predicting ductile fracture are suitable, which experiments are necessary and how calibration of model parameters and validation of model prediction can be performed. Additionally there is no standard established that prescribes the evaluation of limit strain states from experiments. Suitable limit strain states are a basic requirement for prediction of ductile fracture as they are used for calibration of fracture models. In this paper, two methods for evaluation of limit strains are discussed and applied to tensile specimens with circular hole and circular cut outs made from aluminum alloy AlSi0.6Mg0.5. One validation experiment is used to investigate failure prediction that is based on limit strain states from different evaluation methods.

Validation of Kinematic Hardening Parameters from Different Stress States and Levels of Plastic Strain with the Use of the Cyclic Bending Test

2015 ◽  
Vol 639 ◽  
pp. 385-392 ◽  
Author(s):  
Martin Rosenschon ◽  
Sebastian Suttner ◽  
Marion Merklein
Keyword(s):  
Kinematic Hardening ◽  
High Strength Steels ◽  
High Strength ◽  
Bending Test ◽  
Compression Tests ◽  
Cyclic Shear ◽  
Cyclic Bending ◽  
Advanced High Strength Steels ◽  
Hardening Law ◽  
Stress States

The recent development of new lightweight sheet metal materials, like advanced high-strength steels or aluminium alloys, in combination with an increasing component complexity provides new challenges to the numerical material modelling in the FEM based process design. An auspicious approach to improve the quality of the numerical results – most notably in springback analysis – is the modelling of the so called Bauschinger effect achieved through implementation of kinematic hardening models. Within this paper the influence of the stress state and the level of pre-strain on the numerical simulation result of the advanced high strength steel DP-K45/78+Z will be analysed. For this purpose, a parameter identification of the kinematic hardening law according to Chaboche and Rousselier is performed at different pre-strains on the basis of experimental data from tension-compression tests as well as cyclic shear tests. Finally, the identified parameters are validated in a comparison between numerical and experimental results of a cyclic bending test.

Numerical modeling of stress-strain relationships for advanced high strength steels

2021 ◽  
Vol 182 ◽  
pp. 106687
Author(s):  
Yu Xia ◽  
Chu Ding ◽  
Zhanjie Li ◽  
Benjamin W. Schafer ◽  
Hannah B. Blum
Keyword(s):  
Numerical Modeling ◽  
High Strength Steels ◽  
High Strength ◽  
Stress Strain ◽  
Advanced High Strength Steels
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