预循环应力对高速列车关键结构用铝合金材料疲劳裂纹扩展行为的影响
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张啸尘,孟维迎,邹德芳,周鹏,石怀涛
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Effect of Pre-Cyclic Stress on Fatigue Crack Propagation Behavior of Key Structural Al Alloy Materials Used in High Speed Trains
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Xiaochen ZHANG,Weiying MENG,Defang ZOU,Peng ZHOU,Huaitao SHI
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| 表1 Paris公式分段拟合得到的材料常数 |
| Table 1 Material constants based on Paris' law |
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PCS MPa | ΔK at the turning point MPa·m1/2 | Whole fitting | Piecewise fitting (curve 1) | Piecewise fitting (curve 2) |
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| lgC | m | lgC | m | lgC | m |
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| 0 | - | -7.39186 | 3.44199 | -7.39186 | 3.44199 | -7.39186 | 3.44199 | | 30 | 10.41 | -7.75152 | 3.59695 | -9.41163 | 5.33065 | -7.52036 | 3.41039 | | 60 | 11.55 | -8.16278 | 3.89175 | -9.95825 | 5.72909 | -7.79621 | 3.60007 | | 90 | 10.81 | -7.58924 | 3.49789 | -9.77501 | 5.77199 | -7.30743 | 3.27054 | | 120 | 10.22 | -7.41945 | 3.38241 | -8.92749 | 5.00362 | -7.12119 | 3.14091 |
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