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| 1 | 高韧性合金钢断裂韧性及疲劳裂纹扩展门槛值的联合试验方法显示文摘在柴油机曲轴、连杆等关键零部件的可靠性设计和失效评估中,断裂韧性及疲劳裂纹扩展门槛值分别是衡量材料抵抗裂纹失稳扩展和裂纹开始扩展的重要指标.但是,对于高韧性合金材料,难以通过常规试验所推荐的厚度确定平面应变断裂韧性,而门槛值的测定通常不但非常耗时,且难以直接应用于不同循环特性的实际结构.本文针对高韧性合金钢34CrNi3MoA,提出一种将断裂韧性和疲劳裂纹扩展门槛值试验合二为一的试验方法,即用同一个试件可以同时测定门槛值和断裂韧性.利用断裂韧性关于试件厚度的渐近特性,以几种较薄试件的试验,确定平面应变状态下的断裂韧性.试验结果还表明,裂纹扩展门槛值的试件厚度依存性可以忽略,并给出了任意循环特性(应力比)下的门槛值计算公式. | 梁刚 李向哲 欧阳光耀 徐聪聪 许金泉 | 2022 | 力学季刊2022，43，3： | 1 |
| 2 | FATIGUE LIFE PREDICTION OF SUS 630(H900) STEEL UNDER HIGH CYCLE LOADING显示文摘The fatigue life prediction of high strength steel SUS 630(H900)under high cycle loading is conducted with consideration of a characteristic fatigue length of material.Based on the Whler curve of smooth materials,a modified method for fatigue life prediction is approached.The characteristic fatigue length of material under cyclic loading is associated with the polycrystalline material.Rather than the stress at a point,the average stress within the characteristic fatigue length is implemented for the fatigue life prediction.The method can be applied to both the smooth and the defected material.The fatigue life prediction is also verified experimentally by specimens with various small circular holes.Through the comparison,it is found that the method can be adopted to predict the fatigue lives with diferent size efects. | Fengming Guo Miaolin Feng Defu Nie Jinquan Xu Md.Shahnewaz Bhuiyan Yoshiharu Mutoh | 2013 | Acta Mechanica Solida Sinica2013，26，6： | 1 |
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