| 新的非比例加载低周疲劳寿命估算方法 |
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| 引用本文： | 何国求,陈成澍,丁向群,徐瑞萱.新的非比例加载低周疲劳寿命估算方法[J].同济大学学报(自然科学版),2004,32(12):1637-1641. |
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| 作者姓名： | 何国求 陈成澍 丁向群 徐瑞萱 |
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| 作者单位： | 1. 同济大学,材料科学与工程学院,上海,200092;同济大学,上海市金属功能材料开发与应用重点实验室,上海,200092
2. 同济大学,材料科学与工程学院,上海,200092 |
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| 基金项目： | 国家自然科学基金资助项目 (5 0 3 710 63 ,5 95 710 3 5 )，教育部科学技术研究重点项目，上海市教委曙光计划资助项目 |
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| 摘 要： | 利用对 316L不锈钢多轴非比例加载低周疲劳的试验结果 ,对现有的多轴低周疲劳寿命估算方法进行了讨论 ,基于 316L不锈钢非比例加载低周疲劳的微观机理 ,选择最大剪应变以及应变路径的非比例度作为损伤参量 ,建立了基于临界面方法的新的非比例加载低周疲劳寿命估算公式 ,利用新的非比例加载低周疲劳寿命估算公式对寿命的预测结果表明 :新的寿命估算公式对剪切型破坏的 316L与 316LN不锈钢及拉伸型破坏的 30 4不锈钢非比例加载低周疲劳寿命预言能力比现有的临界面方法精确 .
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| 关 键 词： | 金属材料 非比例加载 低周疲劳 寿命估算 |
| 文章编号： | 0253-374X(2004)12-1637-05 |
New Low Cycle Fatigue Life Criterion under Nonproportional Loading Based on Critical Plane Methods |
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| HE Guo-qiu ,CHEN Cheng-shu ,DING Xiang-qun ,XU Rui-xuan.New Low Cycle Fatigue Life Criterion under Nonproportional Loading Based on Critical Plane Methods[J].Journal of Tongji University(Natural Science),2004,32(12):1637-1641. |
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| Authors: | HE Guo-qiu CHEN Cheng-shu DING Xiang-qun XU Rui-xuan |
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| Institution: | HE Guo-qiu 1,2,CHEN Cheng-shu 1,2,DING Xiang-qun 1,2,XU Rui-xuan 1 |
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| Abstract: | The test results of nonproportional low cycle fatigue under multiaxial loading of 316L stainless steel are used. The present multiaxial low cycle fatigue life prediction methods are discussed. Based on the micromechanism of multiaxial low cycle fatigue under nonproportional loading of 316L stainless steel,maxium shear strain and nonproportionality of strain paths are considered as damage parameters of low cycle fatigue. At the same time,the fatigue criterion based on critical plane methods is proposed. The results of fatigue life prediction by using the new low cycle fatigue life criterion under nonproportional loading show that the new fatigue life criterion predicted better fatigue life of shear type failure material 316L and 316LN stainless steel and tensile failure material 304 stainless steel than the other fatigue life criterion did. |
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| Keywords: | metal material nonproportional loading low cycle fatigue life criterion |
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