Results 261 to 270 of about 3,600 (293)
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Lefm brittle and ductile fractures as described by the T-criterion
Engineering Fracture Mechanics, 1988Abstract Fracture is connected with limited amounts of plastic expansion, else materials fail by general yielding. This obvious presupposition of fracture may take two limiting algebraic expressions corresponding to extreme brittle and extreme ductile cases, respectively.
N.P. Andrianopoulos, P.S. Theocaris
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A Plastic-Strain, Mean-Stress Criterion for Ductile Fracture
Journal of Engineering Materials and Technology, 1978We describe a computer model for predicting ductile-fracture initiation and propagation. The model is based on plastic strain. Fracture starts or a crack extends when the integrated product of the equivalent plastic-strain increment and a function of the mean stress exceeds a critical value over a critical length. This critical length is characteristic
D. M. Norris +3 more
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The load separation criterion and methodology in ductile fracture mechanics
International Journal of Fracture, 1991The objective of this paper is to investigate the implications of the load separation criterion for evaluating ductile fracture mechanics parameters. This criterion allows the load to be represented as the multiplication of two separate functions; a material deformation function and a crack geometry function.
M. H. Sharobeam, J. D. Landes
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A triaxiality and Lode parameter dependent ductile fracture criterion
Engineering Fracture Mechanics, 2014Abstract A computational fracture locus is developed and used to predict the ductile fracture in ATSM A992 steels in this study. The fracture locus is obtained by performing micromechanical analyses on the computational cells by deforming computational cells along paths of predefined stress states described by two dimensionless stress-state ...
Ravi Kiran, Kapil Khandelwal
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A new criterion for brittle-to-ductile fracture transition
Acta Metallurgica, 1989The phenomenon of brittle-to-ductile fracture in metals has been examined on the basis of the mechanics of stable crack growth. The analysis indicates that the experimentally observed tearing modulus, TR, is the result of the competition between the intrinsic tearing resistance of the material and a tearing term induced by crack extension, both of ...
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The Method to Determine Material Constants in Ductile Fracture Criterion
Solid State Phenomena, 2018In the metal plastic forming process, ductile fracture is an important factor influencing the forming properties of materials, and the ductile fracture criterion can effectively predict the moment and location when the material fracture. When using the ductile fracture criterion predicts the fracture of materials, the material constants expressed in ...
Jun Wei, Lian Fa Yang, Jian Guo
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Experimental research on ductile fracture criterion in metal forming
Frontiers of Mechanical Engineering, 2011Ductile fracture criterion is key limitation parameter in material forming. Accuracy predicting surface and internal failure in plastic deformation process affects on the technology design of workpiece and die greatly. Tension, compression, torsion and shearing test on 45# steel are utilized for providing the experimental values of the critical values ...
Song Yu, Weiming Feng
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An improved ductile fracture criterion for fine-blanking process
Journal of Shanghai Jiaotong University (Science), 2008In order to accurately simulate the fine-blanking process, a suitable ductile fracture is significant. So an evaluation strategy based on experimental and corresponding simulation results of tensile, compression, torsion and fine-blanking test is designed to evaluate five typical ductile fracture criteria, which are widely-used in metal forming process.
Zhen Zhao, Xin-cun Zhuang, Xiao-long Xie
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A Criterion for ductile fracture in sheets under biaxial loading
Metallurgical Transactions A, 1976A criterion for ductile fracture is developed based on the statistical process of shear joining of voids and on the assumption that the voids responsible for fracture have experienced considerable growth prior to this stage of shearing. From the knowledge of uniaxial flow properties and fracture strain measurement, this model is capable of predicting ...
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Fracture Prediction in Sheet Metal Stamping Based on a Modified Ductile Fracture Criterion
Key Engineering Materials, 2015Sheet metal stamping is an important manufacturing process because of its high production rate and low cost, so the fracture prediction of stamping parts has become important issues. Recent experimental studies have shown that the quality of stamping parts can be increased by using ductile fracture criteria.
Rong Zeng, Liang Huang, Jian Jun Li
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