| 摘要: |
| 通过对HQ-60新钢种的试板和试样焊缝的残余应力实测得到,试样焊缝中的残余应力很小,在研究高应力比下焊缝的疲劳裂纹扩展时可忽略其影响。根据焊缝的裂纹扩展试验结果,得到了在线弹性范围内扩展速率公式。在小范围屈服区提出了一个应力强度因子修正方法,扩大该公式的应用范围,为焊接结构寿命分析提供了方便。 |
| 关键词: 残余应力 疲劳裂纹扩展 应力比 应力强度因子 |
| DOI： |
| 分类号: |
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| Fatigue Crack Growth Rate in Weld Metal of Steel HQ-60 Under High Stress Ratio |
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Gao Jiming, Huang Yuhua, Liu Romgxuan, Chen Jiaquan
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Northeastern University, Shenyang
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| Abstract: |
| It is concluded that the residual stress in specimen welds is quite little, through measuring the stress in the HQ-60 steel test plate and specimen. Therefore the residual stress affect on the crack growth rate can be neglected, when crack growth rate of the specimen under high stress ratio is investigated, According to the results of the crack growth tests in the weld metal, a crack growth formula in linear elastic range (LER) is obtained. In the paper a modificative method of stress intensity factor in small scale yielding range is provided, so the formula in LER can be also used, USing the method, life calculation of welded structures can become convenient. |
| Key words: residual stress fatigue crack growth stress ratio stress intensity factor |
