Edge Fracture Prediction Using Uncoupled Ductile Fracture Models for DP780 Sheet

2017 ◽  
Vol 17 (2) ◽  
pp. 321-329 ◽  
Author(s):  
Lei Mu ◽  
Yuan Wang ◽  
Yong Zang ◽  
Pedro Malaquias Araujo Stemler
Keyword(s):  
Ductile Fracture ◽  
Fracture Prediction ◽  
Edge Fracture ◽  
Fracture Models

Considering Anisotropic Material Behaviour of Sheet Metals for Ductile Fracture Prediction

2014 ◽  
Vol 1018 ◽  
pp. 229-236
Author(s):  
Andreas Sabathil ◽  
Ingo Heinle ◽  
Arnulf Lipp ◽  
Josef Meinhardt ◽  
Marion Merklein
Keyword(s):  
Ductile Fracture ◽  
Anisotropic Material ◽  
Isotropic Material ◽  
Fracture Prediction ◽  
Model Parameters ◽  
Suitable Model ◽  
Sheet Metals ◽  
Material Behaviour ◽  
Fracture Models ◽  
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 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 aluminium alloys are used for body in white components. Therefore various approaches have been presented to model ductile fracture over the past years. However, there is no guideline to determine which models are suitable for predicting ductile fracture. The same applies when it comes to choosing experiments and calibration of model parameters. A suitable model calibration is vital, as the fracture prediction depends on the determined model parameters. Usually an isotropic material behaviour is assumed for calibration of fracture models. However, sheet metals can show an anisotropic material behaviour due to the rolling process. Therefore it is arguable if an isotropic material model can be applied when fracture models are calibrated.

Forming limit analysis of Mg-2Zn-1.2Al-0.2Ca-0.2RE alloy sheet using ductile fracture models

2019 ◽  
Vol 29 (8) ◽  
pp. 1181-1198 ◽  
Author(s):  
Fei-Fan Li ◽  
Gang Fang ◽  
Ling-Yun Qian
Keyword(s):  
Magnesium Alloy ◽  
Ductile Fracture ◽  
Stress Triaxiality ◽  
Forming Limit Diagram ◽  
Alloy Sheet ◽  
Image Correlation ◽  
Forming Limit ◽  
Correlation Technique ◽  
Forming Limits ◽  
Fracture Models

This work was aimed to experimentally and theoretically investigate the formability of a new magnesium alloy sheet at room temperature. The fracture forming limit diagram was predicted by MMC3 and DF2014 models, where the non-linear strain path effect was taken into account by means of damage accumulation law. In order to obtain the instantaneous values of the stress triaxiality and the Lode parameter during the deformation process, strains tracked by digital image correlation technique were transformed into stresses based on the constitutive equations. The fracture forming limit diagram predicted by the fracture models was compared with the forming limits obtained by ball punch deformation tests. The prediction errors were evaluated by the accumulative damage values, which verified the advantages of ductile fracture models in predicting the forming limits of the magnesium alloy sheets.

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