评价铸造A713铝合金疲劳性能的新方法
A New Method for Evaluating Fatigue Property of A713 Cast Aluminum Alloy
摘 要
在材料试验机上对铸造A713铝合金进行四点弯曲疲劳试验, 并通过一种评价疲劳性能的新方法获得了该合金的疲劳弱点密度和强度曲线。结果表明: 试验获得的铸造A713铝合金的疲劳强度为94.5 MPa; 该合金的疲劳弱点密度符合Weibull分布方程, 疲劳弱点强度在应力水平为65%时最大; 与气孔尺寸分布相比, 疲劳弱点密度和强度的分布更适合作为材料疲劳性能的评价指标。
疲劳性能
疲劳弱点
Weibull分布方程
A713 cast aluminum alloy
fatigue property
fatigue weakest link
Weibull distribution equation
Abstract
The four points bending fatigue test was applied to A713 cast aluminum alloy by a material tester, and the curves of the density and strength of fatigue weakest link of the alloy were obtained by a new method of evaluating fatigue property. The results show that the fatigue strength of A713 cast aluminum alloy obtained by this method was 94.5 MPa. The fatigue weakest link density corresponded with Weibull distribution equation, and the fatigue weakest link strength was maximum when the stress level was 65%. Compared with pore size distribution, the distribution of density and strength of fatigue weakest link was more suitable to be used as the evaluation index of fatigue property of materials.
中图分类号 TH142.3
所属栏目 试验研究
基金项目
收稿日期 2011/3/27
修改稿日期 2011/12/14
网络出版日期
作者单位点击查看
备注张元彬(1970-), 男, 山东历城人, 副教授, 博士。
引用该论文: ZHANG Yuan-bin,LUO Hui,HUO Yu-shuang,LIU Peng,ZHAI Tong-guang. A New Method for Evaluating Fatigue Property of A713 Cast Aluminum Alloy[J]. Materials for mechancial engineering, 2012, 36(4): 5～8
张元彬,罗辉,霍玉双,刘鹏,翟同广. 评价铸造A713铝合金疲劳性能的新方法[J]. 机械工程材料, 2012, 36(4): 5～8
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参考文献
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【2】WANG Q G, APELIAN D, LADOS D A. Fatigue behavior of A356-T6 aluminum cast alloys, Part I: effect of casting defects[J].Journal of Light Metals, 2001, 1(1): 73-84.
【3】TODINOV M. A probabilistic method for predicting fatigue life controlled by defects[J].Materials Science and Engineering A, 1998, 255: 117-123.
【4】ATZORI B, MENEGHETTI G, SUSMEL L. Fatigue behavior of A356-T6 cast aluminum alloy weakened by cracks and notches[J].Engineering Fracture Mechanics, 2004, 71: 759-768.
【5】LINDER J, AXELSSON M, WILSSON H. The influence of porosity on the fatigue life for sand and permanent mould cast aluminum[J].International Journal of Fatigue, 2006, 28: 1752-1758.
【6】YI J Z, GAO Y X, LEE P D, et al. Scatter in fatigue life due to effects of porosity in cast A356-T6 aluminum-silicon alloys[J].Metallurgical and Materials Transactions A, 2003, 34: 1879-1890.
【7】ZHAI T. Strength distribution of fatigue crack initiation sites in an Al-Li alloy[J].Metallurgical and Materials Transactions A, 2006, 37: 3139-3147.
【8】ZHAI T, XU Y G, MARTIN J W, et al. A self-aligning four-point bend testing rig and sample geometry effect in four-point bend fatigue[J].International Journal of Fatigue, 1999, 21: 889-894.
【9】TIRYAKIOGLU M. Statistical distributions for the size of fatigue-initiating defects in Al-7%Si-0.3%Mg alloy castings: a comparative study[J].Materials Science and Engineering A, 2008, 497: 119-125.
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