铝铜定向凝固合金热疲劳应力场数值模拟

刘海霞; 司松海; 司乃潮; 袁婷婷

doi:10.3969/j.issn.1671-7775.2011.06.018

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江苏大学学报（自然科学版） ›› 2011, Vol. 32 ›› Issue (6) : 710-714. DOI: 10.3969/j.issn.1671-7775.2011.06.018

论文

铝铜定向凝固合金热疲劳应力场数值模拟

作者信息 +

Numerical simulation on thermal fatigue stress field of
directionally solidified Al-Cu alloy

Author information +

文章历史 +

摘要

利用有限元分析软件ANSYS,模拟分析了铝铜定向凝固合金(铜质量分数45％)热疲劳应力场的分布,建立了有限元分析模型,得出了热应力在冷热循环条件下的变化规律．结果表明:在一个热循环周期内,热应力开始以小三角形方式向试样内部扩展,之后以2条主线的方式快速扩展,最后热应力变化趋于平缓．在一次循环结束后,试样内部有残余应力存在,预制缺口处出现应力集中．随着循环次数的增加,残余应力逐渐累积．当累积的残余应力达到一定值后,在应力集中的作用下,预制缺口处出现裂纹．通过有限元分析与试样热疲劳试验的结果对比,验证了所采用有限元分析模型的可靠性．

Abstract

The thermal fatigue stress field of directionally solidified Al-Cu alloy with Cu mass fraction of 4.5%) was investigated with commercial finite element method(FEM) software ANSYS. Changing rules of thermal stress field were obtained under thermal cycling condition. In one thermal cycle,thermal stress expands into the sample by the form of small triangle,and with later quick extending by the form of master stroke. The change of thermal stress becomes slow finally. After one cycle, there is residual stress in the sample. With the increasing of cycle extent, residual stress cumulates gradually. Thermal fatigue cracks appear when residual stress reaches a certain extent. Furthermore, simulating results were compared with experimental results of thermal fatigue crack initiation and propagation in alloy samples. The results validate the reliability of the adopted FEM.

导出引用

刘海霞, 司松海, 司乃潮, 等. 铝铜定向凝固合金热疲劳应力场数值模拟[J]. 江苏大学学报（自然科学版）, 2011, 32(6): 710-714 https://doi.org/10.3969/j.issn.1671-7775.2011.06.018

LIU Hai-Xia, SI Songhai, SI Naichao, et al. Numerical simulation on thermal fatigue stress field of
directionally solidified Al-Cu alloy[J]. Journal of Jiangsu University(Natural Science Edition), 2011, 32(6): 710-714 https://doi.org/10.3969/j.issn.1671-7775.2011.06.018

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