| 20g钢断裂性质的研究 |
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| 引用本文： | 朱汉兴,洪文生.20g钢断裂性质的研究[J].华中科技大学学报(自然科学版),1992(6). |
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| 作者姓名： | 朱汉兴 洪文生 |
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| 作者单位： | 华中理工大学力学系
(朱汉兴)，福建经济管理干部学院(洪文生) |
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| 摘 要： | 本文实验测试了预应变对20g钢断裂韧性的影响.在弹塑性有限元数值分析的基础上,讨论了裂纹尖端张开位移与最大应变间的关系及预应变量ε_p对临界断裂应变的影响.同时,在Rice-Tracey空穴扩张模型的基础上,探讨了裂纹前方空穴形成的原因及主裂纹扩展的条件,分析了预应变量ε_p对20g钢断裂性质的影响.
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| 关 键 词： | 钢板 预应变 断裂韧性 断裂应变 空穴扩张 裂纹扩展 |
An Investigation on the Fracture Properties of Type 20g steel |
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| Zhu Hanxing Hong Wensheng.An Investigation on the Fracture Properties of Type 20g steel[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,1992(6). |
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| Authors: | Zhu Hanxing Hong Wensheng |
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| Institution: | Zhu Hanxing Hong Wensheng |
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| Abstract: | The effects of pre-strain on the fracture toughness have been measured experimentally. It is found that the fracture toughness of type 20g steel decreases by over 30 percent at ep= 1% as compared with that of unprestr-ained steel of the same type. At ep = 2%, however, the toughuess improves and gradually decreases again as ep increases and the fracture properties change from ductile to brittle with increased ep. Based on an elastic-plastic FEM analysis, the relationship between the crack tip opening displacement and the maximum strain have been examined. The cause of void formation in front of the crack tip, the condition for the principal crack propagation and the effects of prestrain on the fracture properties of type 20g steel are investigated with a Rice-Tracey's void growth model. |
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| Keywords: | steel plate prestrain fracture toughness fracture strain void growth crack propagation |
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