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栽荷条件下，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。
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.
参考文献
| [1] | 陈秀华,匡国强,汪海,杨凤鹏.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(01):18-21. |
| [2] | 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(04):0. |
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