| 塑性变形对低碳钢断裂韧性及COD降低系数β的影响 |
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| 引用本文： | 朱汉兴.塑性变形对低碳钢断裂韧性及COD降低系数β的影响[J].华中科技大学学报(自然科学版),1992(1). |
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| 作者姓名： | 朱汉兴 |
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| 作者单位： | 华中理工大学力学系 |
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| 摘 要： | 本文以实验测得的材料单向拉伸曲线为依据,对三点弯曲试件进行了弹塑性有限元计算.模拟实验的实际情况考察了塑性变形ε_p对20g和16MnR钢的断裂韧性的影响,COD降低系数β与裂纹尖端张开位移δ_T的关系,以及ε_p对临界系数β_c的影响.所得结果与有关实验结果基本吻合.
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| 关 键 词： | 低碳钢 塑性变形 断裂韧性 COD降低系数 |
The Effect of Plastic Deformation on Fracture Toughness and COD-Reduced Factor of Low-Carbon Steel |
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| Zhu Hanxing.The Effect of Plastic Deformation on Fracture Toughness and COD-Reduced Factor of Low-Carbon Steel[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,1992(1). |
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| Authors: | Zhu Hanxing |
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| Institution: | Zhu Hanxing |
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| Abstract: | Based on the measured uniaxial tensile stress-strain curves of type 16-MnR and 20g steels, a three-point-bending specimen is investigated with the elastic-plastic finite element method by simulating actual experimental conditions. It is found that, for various plastic predeformation ep, COD-reduced factor B increases linearly with an increase of r approximately. Significant effects of plastic pre-deformation p on the fracture toughness of the above mentioned two types of steel have been observed, with an increase of p, Bc gradually decreases and the materials are found to be gradually getting brittle. Calculation results agree well with experimental ones. |
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| Keywords: | low-carbon steel plastic deformation fracture toughness COD reduced factor |
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