| 一个修正的金属材料低周疲劳损伤模型 |
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| 引用本文： | 关迪, 孙秦, 杨锋平. 一个修正的金属材料低周疲劳损伤模型[J]. 固体力学学报, 2013, 34(6): 571-578. doi: 10.3969/j.issn.0254-7805.2013.06.005 |
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| 作者姓名： | 关迪 孙秦 杨锋平 |
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| 作者单位： | 西北工业大学航空学院,西安,710072; 西北工业大学航空学院,西安,710072; 中国石油管工程技术研究院石油管力学和环境行为重点实验室,西安,710065 |
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| 摘 要： | 疲劳破坏是金属最常见的失效形式之一.基于连续损伤力学理论和能量原理,论文提出了一个修正的金属材料低周疲劳损伤演化方程,该方程综合考虑了材料的塑性强化、微裂纹闭合效应等因素对损伤累积的影响.将修正后的损伤演化方程以UMAT子程序的形式导入有限元计算软件ABAQUS之中,建立了疲劳损伤的计算模型,并以铝合金7050-T7451为例对该模型的有效性和适用性进行了验证.
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| 关 键 词： | 低周疲劳 疲劳损伤 损伤演化方程 疲劳寿命 |
| 收稿时间： | 2012-11-12 |
A MODIFIED LOW CYCLE FATIGUE DAMAGE MODEL FOR METALS |
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| Di Guan, Qin Sun, Fengping Yang. A MODIFIED LOW CYCLE FATIGUE DAMAGE MODEL FOR METALS[J]. Chinese Journal of Solid Mechanics, 2013, 34(6): 571-578. doi: 10.3969/j.issn.0254-7805.2013.06.005 |
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| Authors: | Di Guan Qin Sun Fengping Yang |
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| Abstract: | Fatigue failure is one of the most common failure modes of metal materials and structures. In this paper, a modified low cycle fatigue damage law is presented, based on the continuum damage mechanics and energy principle, which considers the effects of plastic hardening and microdefects closure into damage evolution. To predict the fatigue failure of metal materials, the modified damage model is incorporated into the commercial finite element platform ABAQUS/ Explicit through a user material subroutine UMAT. In addition, the validity and applicability of this model are examined by comparing the numerical results with the experimental data of aluminum alloy 7050-T7451. |
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| Keywords: | low cycle fatigue fatigue damage damage law fatigue life |
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