| 复杂应力状态下船用低碳钢断裂应变的“断崖现象” |
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| 引用本文： | 张朴,赵明艳,李营,张玮,任宪奔,方岱宁.复杂应力状态下船用低碳钢断裂应变的“断崖现象”[J].船舶力学,2020(2):191-196. |
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| 作者姓名： | 张朴 赵明艳 李营 张玮 任宪奔 方岱宁 |
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| 作者单位： | 武汉理工大学交通学院;江南造船（集团）有限责任公司;北京理工大学爆炸科学与技术国家重点实验室;海军研究院 |
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| 基金项目： | 国家自然科学基金资助项目（11802030;515091）;装备预研教育部联合基金青年人才项目（6141A02033108）;北京市科委重大专项（No.Z181100004118002） |
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| 摘 要： | 文章进行了应力状态的坐标转换,开展了68个低碳钢圆棒拉伸、缺口拉伸、圆柱墩粗、压剪和简单剪切等试样在复杂应力状态下的断裂特性实验,再现了低应力三轴度时断裂应变“断崖现象”,基于Lode角与应力三轴度的联合作用对该现象进行了解释。通过遗传算法,给出了优化后的低碳钢Bai断裂准则参数,并通过比较不同断裂准则预测值与实验值,验证了Bai准则的有效性。
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| 关 键 词： | 应力三轴度 Lode角 断裂准则 复杂应力状态 低碳钢 抗爆炸 |
Failure strain sharp-down of marine mild steel under complex stress states |
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| ZHANG Pu,ZHAO Ming-yan,LI Ying,ZHANG Wei,REN Xian-ben,FANG Dai-ning.Failure strain sharp-down of marine mild steel under complex stress states[J].Journal of Ship Mechanics,2020(2):191-196. |
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| Authors: | ZHANG Pu ZHAO Ming-yan LI Ying ZHANG Wei REN Xian-ben FANG Dai-ning |
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| Institution: | (School of Transportation,Wuhan University of Technology,Wuhan 430063,China;Jiangnan Shipbuilding Co.Ltd.,Shanghai 200011,China;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Naval Research Academy,Beijing 100161,China) |
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| Abstract: | The basic theory of stress triaxiality and Lode angle was discussed.A series of tests including up⁃setting tests,shear tests and tensile tests on mild steel providing clues to fracture ductility for a wide range of stress triaxiality were carried out.There was a sharp decrease in low stress triaxiality region,which was stud⁃ied and explained based on stress triaxiality and Lode angle.New fracture criterion parameters were given through genetic algorithm,and the accuracy of parameters was identified by comparing different fracture crite⁃rions with experimental data. |
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| Keywords: | stress triaxiality Lode angle fracture criterion complex stress state mild steel blast resistance |
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