| 弹塑性断裂韧性及断裂评估的新方法 |
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| 引用本文： | 马法尚.弹塑性断裂韧性及断裂评估的新方法[J].西安交通大学学报,1993,27(6):19-24,30. |
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| 作者姓名： | 马法尚 |
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| 作者单位： | 西安交通大学工程力学系 |
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| 基金项目： | 机械结构与振动国家重点实验室基金 |
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| 摘 要： | 基于裂端区断裂失效的微观机理，结合修正Ｊ－Ｑ理论，本文导出了宏观断裂参数与裂端约束的关系，提出了描述材料断裂起裂起的理论断裂韧性及以此进行不同约束条件下断裂评估的一种新方法，利用大变形弹塑性有限元方法，分析了平面应力平面应变紧凑拉伸试件的裂端应力变场，对于厚度为０．５ｍｍ及２５ｍｍ的试件进行了弹塑性断裂评估。
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| 关 键 词： | 断裂韧性 损伤 应力 弹塑生 |
ELASTIC-PLASTIC FRACTURE TOUGHNESS AND A NEW METHOD OF FRACTURE ASSESSMENT |
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| Ma Fashang.ELASTIC-PLASTIC FRACTURE TOUGHNESS AND A NEW METHOD OF FRACTURE ASSESSMENT[J].Journal of Xi'an Jiaotong University,1993,27(6):19-24,30. |
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| Authors: | Ma Fashang |
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| Institution: | Department of Engineering Mechanics |
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| Abstract: | Based on the micromechanism of fracture proeess in crack tip region and a modified J-Q theory, the relationship between the global fracture parameter and the constraint in the region was obtained in this paper. The theoretical fracture toughness characterizing the fracture onset and a framework of assessment of constrained fracture were proposed. Using the large deformation FEM the stress and strain near a tip in CT specimens were analyzed by plane stress and plane strain deformation, respectively. Fracture assessments for CT specimens with thickness of 0. 5 mm and 25 mm were conducted. |
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| Keywords: | fraeture toughness damage tress strain |
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