Failure Prediction in Stretched Sheets of Aluminium 2024-T3

2006 ◽  
Vol 526 ◽  
pp. 91-96 ◽  
Author(s):  
C. Vallellano ◽  
C. Guzman ◽  
J. Garcia Lomas
Keyword(s):  
Hydrostatic Pressure ◽  
Ductile Fracture ◽  
Aluminium Alloy ◽  
Normal Stress ◽  
Failure Prediction ◽  
Alloy Sheet ◽  
Experimental Results ◽  
Fracture Plane ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria

The present work analyses experimentally and numerically the failure limit of a 2024-T3 aluminium alloy sheet subjected to stretching. The capability of a number of ductile fracture criteria to predict sheet failure is examined and compared with experimental results. The influence of the hydrostatic pressure in the Freudenthal’s, the Cockcroft and Latham’s and the Bressan and Williams’ criterion is analyzed. The effect of the normal stress on the fracture plane in the Bressan and Williams’ criterion is also discussed.

Finite Element Analysis of the Hydro-Mechanical Punching Process

2006 ◽  
Vol 505-507 ◽  
pp. 871-876
Author(s):  
Jong Hun Yoon ◽  
Hoon Huh ◽  
Yong Sin Lee ◽  
Seung Soo Kim ◽  
E.J. Kim ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Ductile Fracture ◽  
Sheet Material ◽  
Middle Surface ◽  
Initial Crack ◽  
Fracture Criteria ◽  
Element Analysis ◽  
Final Fracture ◽  
Ductile Fracture Criteria ◽  
Punching Process

This paper investigates the characteristics of a hydro-mechanical punching process. The hydro-mechanical punching process is divided into two stages: the first stage is the mechanical half piercing in which an upper punch goes down before the initial crack is occurred; the second stage is the hydro punching in which a lower punch goes up until the final fracture is occurred. Ductile fracture criteria such as the Cockcroft et al., Brozzo et al. and Oyane et al. are adopted to predict the fracture of a sheet material. The index value of ductile fracture criteria is calculated with a user material subroutine, VUMAT in the ABAQUS Explicit. The hydrostatic pressure retards the initiation of a crack in the upper region of the blank and induces another crack in the lower region of the blank during the punching process. The final fracture zone is placed at the middle surface of the blank to the thickness direction. The result demonstrates that the hydro-mechanical punching process makes a finer shearing surface than the conventional one as hydrostatic pressure increases.

Fracture analysis on U-bending of AA6061 aluminum alloy sheet using phenomenological ductile fracture criteria

2020 ◽  
Vol 148 ◽  
pp. 106566 ◽  
Author(s):  
Hossein Talebi-Ghadikolaee ◽  
Hassan Moslemi Naeini ◽  
Mohammad Javad Mirnia ◽  
Mohammad Ali Mirzai ◽  
Hamid Gorji ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Ductile Fracture ◽  
Fracture Analysis ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria

Application of Ductile Fracture Criteria to Industrial Cutting Processes

2011 ◽  
Vol 264-265 ◽  
pp. 913-918 ◽  
Author(s):  
Jindrich Petruška ◽  
Jan Borkovec ◽  
Jiri Hulka ◽  
Rudolf Foret
Keyword(s):  
Plastic Deformation ◽  
Ductile Fracture ◽  
Cutting Tool ◽  
Experimental Results ◽  
Metallographic Analysis ◽  
Computational Results ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria ◽  
Numerical Studies ◽  
Cutting Processes

Experimental and numerical studies of fracture prediction with Czech steel no.41 2050 are presented. Seven ductile fracture criteria were calibrated, applied to simulation of rod cutting and bolt head trimming operation and compared with experimental results of these processes, obtained in semi-industrial conditions in cooperation with our industrial partner. Movement of the cutting tool was stopped in predefined positions, so that a step-by-step mapping of subsequent stages of both processes were obtained at different specimens. By metallographic analysis of these, full view of plastic deformation and damage in the vicinity of the cutting region could be seen, and their comparison with the computational results was done.

Assessment of Newly Developed Ductile Fracture Criteria for Lightweight Metals

2019 ◽  
Vol 794 ◽  
pp. 42-47
Author(s):  
Ru Gang Chai ◽  
Yan Shan Lou ◽  
Jeong Whan Yoon
Keyword(s):  
Shear Stress ◽  
Ductile Fracture ◽  
Stress Triaxiality ◽  
Experimental Results ◽  
Loading Conditions ◽  
Fracture Criteria ◽  
Lode Parameter ◽  
Ductile Fracture Criteria ◽  
Lightweight Metals

This paper assesses various newly developed ductile fracture criteria including modified Mohr-Coulomb (MMC), DF2012, DF2014, DF2016, Hu-Chen and Mu-Zang, which were all proposed in the last decade. The AA2024-T351 is used for the assessment by comparing the predicted fracture limits to the experimental results both in strain and stress spaces. Fracture loci are also constructed by these criteria to evaluate their characteristics. The evaluation demonstrates that the Lode parameter and stress triaxiality should be properly coupled for reasonable modeling of ductile fracture in wide loading conditions. This study also shows that the coupling of the Lode parameter can also be realized by introducing the effect of the largest shear stress in fracture criteria.

Evaluation of Seven Ductile Fracture Criteria for Failure Prediction of AZ31 Sheet in Warm Forming

2012 ◽  
Vol 482-484 ◽  
pp. 1947-1950 ◽  
Author(s):  
Jian Guang Liu ◽  
Wei Liu
Keyword(s):  
Ductile Fracture ◽  
Fracture Criterion ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Ductile Fracture Criterion ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria ◽  
Element Simulation ◽  
Az31 Mg Alloy ◽  
Az31 Sheet

Seven commonly used ductile fracture criteria are briefly reviewed and the validity of predicting the failure of AZ31 Mg alloy sheet by using these ductile fracture criteria is evaluated. Through fitting the experimental FLCs, the damage parameters for these ductile fracture criteria are determined firstly. Integrating these seven ductile fracture criteria into Abaqus/Explicit via VUMAT subroutine, the warm deep drawing process of AZ31 Mg alloy sheet is simulated. The limit drawing ratios (LDR) of AZ31 Mg alloy sheet at different temperature are predicted. The comparison of predictions with the experimental results has shown that the combination of the finite element simulation and the ductile fracture criterion is useful for predicting the fracture occurred in warm deepdrawing of AZ31 Mg alloy sheet.

Damage evaluation in tube spinnability test with ductile fracture criteria

2015 ◽  
Vol 100 ◽  
pp. 99-111 ◽  
Author(s):  
Hao Ma ◽  
Wenchen Xu ◽  
Bo Cheng Jin ◽  
Debin Shan ◽  
Steven R. Nutt
Keyword(s):  
Ductile Fracture ◽  
Damage Evaluation ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria

Behavior of Lode Dependent Plasticity at Plane Strain Condition and its Implication to Ductile Fracture

2016 ◽  
Vol 258 ◽  
pp. 213-216 ◽  
Author(s):  
František Šebek ◽  
Jindrich Petruška ◽  
Petr Kubík
Keyword(s):  
Ductile Fracture ◽  
Plane Strain ◽  
Uniaxial Stress ◽  
Complex Materials ◽  
Fracture Criteria ◽  
Dependent Plasticity ◽  
Ductile Fracture Criteria ◽  
Stress States ◽  
Aluminum Alloy 2024 ◽  
Von Mises

Variety of metals are complex materials exhibiting various behavior under different loading. Many metallic materials exhibit Tresca-like behavior rather than von Mises. It means different behavior in tension under plane strain and uniaxial stress conditions. This might be described by Lode dependent plasticity which should result in better prediction in force or torque responses of material tests. Good agreement between computation and experiment is also very important when calibrating the ductile fracture criteria. Several tests under plane strain and uniaxial stress states were carried out on aluminum alloy 2024-T351 where the Lode dependency was significant. The Lode dependent plasticity was implemented along with von Mises and Tresca-like yield criteria, which resulted in improvement of force–displacement responses of plane strain tests simulations. But it also caused significant change in the stress state of tensile flat and grooved plates which wrongly approached uniaxial tension condition. This inconvenience prevents plane strain experiments from using for calibration of ductile fracture criteria under these circumstances.

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