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| 1 | EVALUATION OF DUCTILE FRACTURE CRITERIA IN A GENERAL THREE-DIMENSIONAL STRESS STATE CONSIDERING THE STRESS TRIAXIALITY AND THE LODE PARAMETER显示文摘This paper is concerned with evaluation of various ductile fracture criteria in a general three-dimensional stress state of stress triaxiality,the Lode parameter and the equivalent plastic strain to fracture.Evaluation is carried out by comparing fracture loci constructed by fracture criteria to experimental results of Al2024-T351.Comparison demonstrates that the Modified Mohr-Coulomb criterion and a newly proposed criterion provide sufcient predictability of fracture strain.Moreover,evaluation is emphasized on the predicted cut-of value for stress triaxiality.The evaluation demonstrates that the Cockcroft-Latham,Brozzo,Oh,Ko-Huh and the new criteria coupled a reasonable cut-of value for ductile materials. | Yanshan Lou Hoon Huh | 2013 | Acta Mechanica Solida Sinica2013，26，6： | 5 |
| 2 | Tensile and compression properties of Zr-based bulk amorphous alloy at different temperatures显示文摘Mechanical properties of the Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy at different temperatures were investigated. The compression test was carried out on a Gleebe-3200 machine at 345 and 375℃, respectively, in the supercooled liquid region. It is shown that decreasing the compressive rate and increasing temperature have a similar influence trend on the compressive behavior of the bulk amorphous alloy. Room and low temperature tensile strengths were tested on the Instron materials testing system. At low temperature, the tensile strength decreased with decreasing of the testing temperature. Hardness measurement indicated that below the glass transition temperature, the hardness decreased with increasing of the annealing temperature and duration time. It, however, increased when the annealing treatment was performed above the glass transition temperature. | WANG Xu1,3, LOU Decheng1, GAO Zhanjun4, LIU Lei1, LIANG Hongmei1, WANG Qingfeng1, LI Qiang1,3 & MA Mingzhen1,2 1. Key Laboratory of Metastable Materials Science & Technology of Hebei, Yanshan University, Qinhuangdao 066004, China 2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China 3. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China 4. Chinese Academy of Engineering, Beijing 100038, China | 2005 | Science China(Technological Sciences)2005，48，5： | 4 |
| 3 | Prediction of ductile fracture for advanced high strength steel with a new criterion:Experiments and simulation显示文摘 | Lou Yanshan Hoon H | 2013 | Journal of Materials Processing Technology2013，213，8： | 1 |
| 4 | Effect of Anisotropic Yield Functions on the Accuracy of Material Flow and its Experimental Verification显示文摘This paper evaluates the performance of anisotropic yield functions based on mathematical methods which consider the prediction accuracy of yield stresses and values.The anisotropic yield functions being evaluated include one quadratic yield function and six nonquadratic ones.These yield functions are applied to describe the anisotropy of st eel sheets and aluminum alloy sheets to evaluate their predictability.The root-mean-square errors(RMSEs)are computed to quantitatively assess their performance.The computation results of RMSEs demonstrate that the Yld2004-18p yield function exhibits the highest accuracy but requires extensive tests to calculate anisotropic parameters.The Yld2000-2d and BBC2000 yield functions are the same and thus have the same prediction accuracy.The application to cylindrical cup drawing shows that,associated with the Yld2004-18p and Yld2000-2d yield functions,the finite element(FE)simulations of cup drawing process can predict cups with six or eight ears.Considering both efficiency and accuracy,the Yld2000-2d and BBC2000 yield functions,which have less anisotropic parameters to be calculated,are recommended for metals with intermediate anisotropy. | Bingtao Tang Yanshan Lou | 2019 | Acta Mechanica Solida Sinica2019，32，1： | 1 |
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