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压载荷对疲劳裂纹在Paris区内扩展影响的有限元研究 被引量：6

FINITE ELEMENT STUDY OF THE EFFECTS OF COMPRESSIVE LOAD ON THE FATIGUE CRACK GROWTH IN PARIS REGION
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摘要 以7049-UA铝合金为研究对象,用弹塑性有限元方法分析拉压循环载荷下,三条不同裂纹长度的裂尖应力场,通过裂尖的应力状态定义一个考虑压载荷影响的有效应力强度因子范围参数ΔKef′f,并利用此参数,定量分析循环拉压载荷对铝合金疲劳裂纹扩展的促进作用,并提出一种简便的利用有限元方法拟合应力比为负值时Paris区的疲劳裂纹扩展速率的方法,与已发表的实验数据相比较,得到较好的验证。 An elastic-plastic finite element analysis has been performed to solve the crack tip stress fields for three different crack lengths under tensile-compressive loading in 7049-UA Aluminum alloy. A redefined effective stress intensity factor range, AKeff＇, incorporating the effect of the compressive stress, based on the finite element analysis results of the crack tip stress state, is proposed. Using this new parameter, the influence of the negative stress on the fatigue crack propagation rate under the cyclic tension-compression loading can be revalued quantitatively. A simple finite element method is introduced to predict the fatigue crack propagation rate under the negative stress ratio. The finite element calculated results has been used to correlate the published experimental data and good correlation has been obtained.
作者 宋欣 张嘉振 赫晓东
机构地区 哈尔滨理工大学机械动力工程学院 哈尔滨工业大学复合材料及结构研究所
出处 《机械强度》 CAS CSCD 北大核心 2009年第1期122-127,共6页 Journal of Mechanical Strength
基金 国家自然科学基金资助项目(10772063)~~
关键词 压载荷 疲劳 裂纹扩展 铝合金 弹塑性 有限元分析 Compressive loading Fatigue Crack growth Aluminum alloy Elastic-plastic Finite element analysis
分类号 O346 [理学—固体力学] TG146.21 [金属学及工艺—金属材料]
  • 相关文献

参考文献14

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二级参考文献33

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共引文献13

同被引文献60

  • 1胡志忠,曹淑珍.形变硬化指数与强度的关系[J].西安交通大学学报,1993,27(6):71-76. 被引量：28
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  • 3刘军,刘道新,刘元镛,唐长斌.微动接触应力的有限元分析[J].机械强度,2005,27(4):504-509. 被引量：25
  • 4李辛.硬化对裂纹塑性区的影响[J].辽宁师范大学学报（自然科学版）,2006,29(2):179-180. 被引量：4
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  • 8Fonte Mda, Romeiro F, Freitas Mde, Stanzl-Tschegg S E, Tchegg E K, Vasudevan A K. The effect of microstructure and environment on fatigue crack growth in 7049 aluminium alloy at negative stress ratios [J]. International Journal of Fatigue, 2003, 25(9/10/11): 1209--1216.
  • 9Silva F. Crack closure inadequacy at negative stress ratios [J]. International Journal of Fatigue, 2004, 26(3): 241 --252.
  • 10Silva F. The importance of compressive stresses on fatigue crack propagation rate [J]. International Journal of Fatigue, 2005, 27(10/11/12): 1441 -- 1452.

引证文献6

二级引证文献21

机械强度
2009年 第1期

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