耳片斜切角对孔边疲劳裂纹扩展速率的影响
Effect of Attachment Lug′s Bevel Angle on Fatigue Crack Growth Rate
摘 要
采用符合受纵向拉载耳片销钉传载的余弦载荷分布对边界条件进行了设定, 运用有限元法对四种不同斜切角耳片的孔边裂纹尖端应力强度因子(SIF)进行了求解, 对比分析了耳片斜切角度对裂纹扩展各阶段SIF值的影响规律; 同时对与有限元模型相同尺寸的四件30CrMnSiA耳片进行了疲劳裂纹扩展试验。结果表明: 在相同的裂纹长度和载荷条件下, 斜切耳片裂尖的SIF值明显小于直耳片的, 特别是15°斜切耳片的裂尖SIF值和疲劳裂纹扩展速率相对于直耳片已有大幅下降, 继续增加斜切角度对耳片抗裂纹扩展能力无明显提升; 试验结果与有限元分析结果吻合较好。
耳片
应力强度因子
疲劳裂纹扩展速率
finite element method
attachment lug
stress intensity factor
fatigue crack growth rate
Abstract
The stress intensity factors (SIFs) on crack tips of four typical attachment lugs under longitudinal load were solved by using the finite element method (FEM), cosine-distributed load that accord with the load transfer of pin was set as the boundary condition. The effect of the bevel angle on stress intensity factor (SIF) at different stages of crack growth was analyzed. The corresponding fatigue test of 30CrMnSiA lugs with the same size as the FEM models was carried out. The results show that the SIF of beveled lug were obviously less than straight lug under the conditions of the same crack length and the load, the crack growth rate of beveled lug with 15° was obviously less than that of the straight lug, and increasing bevel angle had not obviously increase the crack growth resistance. The test result get a satisfactory accordance with the finite element analysis result.
中图分类号 TB301 TH122
所属栏目 物理模拟与数值模拟
基金项目 国家“863”计划资助项目(2009AA04Z406); 国家自然科学基金资助项目(50975284); 陕西省自然科学基金资助项目(SJ08E107)
收稿日期 2011/10/30
修改稿日期 2012/7/28
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备注伍黎明(1985-), 男, 山西运城人, 博士研究生。
引用该论文: WU Li-ming,HE Yu-ting,ZHANG Hai-wei,WANG Xin-bo,DING Hua. Effect of Attachment Lug′s Bevel Angle on Fatigue Crack Growth Rate[J]. Materials for mechancial engineering, 2012, 36(11): 106～108
伍黎明,何宇廷,张海威,王新波,丁华. 耳片斜切角对孔边疲劳裂纹扩展速率的影响[J]. 机械工程材料, 2012, 36(11): 106～108
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参考文献
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【2】张树祥. 任意角度受载的耳片强度分析[J]. 机械设计, 1992(1): 22-25.
【3】刁文琦. 耳片接头的静强度可靠性分析与计算[J].飞机设计, 1993(1): 59-72.
【4】陈秀华, 匡国强, 汪海, 等, 飞机平尾升降舵接头耳片承载能力分析与试验[J].计算机辅助工程, 2009, 18(1): 18-21.
【5】WALKER C A, MCKELVIE J, HYZER J B . An analysis of residual stress patterns resulting from hole expansion in an infinite plate, a thick cylinder, and an asymmetric lug[J]. Optics and Lasers in Engineering, 1997, 27:75-87.
【6】KUMAR K S, DATTAGURU B, RAMAMURTHY T S. Analysis of a cracked lug loaded by an interference fit pin[J]. Int J Mech Sci, 1996, 38: 967-979.
【7】VOGWELL J. Failure in lug joints and plates with holes[J]. Engineering Failure Analysis, 1995, 2(2): 129-135.
【8】黄其青. 对称与非对称斜削耳片危险部位及应力强度因子的有限元分析[J]. 航空学报, 1998, 19(4): 466-470.
【9】高庆. 工程断裂力学[M]. 重庆: 重庆大学出版社, 1986.
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