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首页> 外文期刊>Journal of engineering materials and technology >The Effect of Cold Expansion on the Fatigue Life of the Chamfered Holes
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The Effect of Cold Expansion on the Fatigue Life of the Chamfered Holes

机译：冷胀对倒角孔疲劳寿命的影响

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摘要

The cold expansion method is one of the most popular techniques in the fatigue enhancement processes, and it has been widely used as a means of improving the fatigue resistance for aircraft structures with holes. Cold expanded holes have lower compressive residual stresses on the entry surface rather than the middle and exit surfaces. Due to the nonuniform residual stress distribution, fatigue crack initiation often occurs on the entry surface. This study proposes a new approach to increase the compressive residual stress magnitude at the entry of the hole. The new method is to apply chamfers into holes before the cold expansion process. Split mandrel process was used to cold work the hole with and without chamfers. Both numerical and experimental studies were done to verify the effects of hole chamfers on the residual stress distribution of the cold expanded holes. Finite element analysis (FEA) was conducted in order to see the effects of the chamfer geometries on the residual stress distributions. The FEA results showed an improvement of compressive residual stress magnitudes at the entry position of the cold expanded hole. The numerical results were compared with X-ray diffraction measurements. Fatigue tests were done to compare the fatigue life of the holes with various chamfer sizes and angles. The cold expansion chamfered holes showed a clear improvement in fatigue life over cold expanded holes without chamfers.
机译：在疲劳增强过程中，冷膨胀法是最流行的技术之一，它已被广泛用作改善带孔飞机结构的抗疲劳性的一种手段。冷扩孔在入口表面而不是中间和出口表面具有较低的压缩残余应力。由于残余应力分布不均匀，因此疲劳裂纹萌生经常发生在入射表面上。这项研究提出了一种新的方法来增加孔洞入口处的残余压缩应力。新方法是在冷膨胀过程之前将倒角倒入孔中。分割心轴工艺用于对有或没有倒角的孔进行冷加工。进行了数值和实验研究，以验证孔倒角对冷扩孔残余应力分布的影响。进行了有限元分析（FEA），以了解倒角几何形状对残余应力分布的影响。有限元分析结果表明，冷扩孔入口处的残余压缩应力大小有所改善。将数值结果与X射线衍射测量结果进行比较。进行了疲劳测试，以比较各种倒角尺寸和角度的孔的疲劳寿命。与没有倒角的冷膨胀孔相比，冷膨胀倒角孔显示出疲劳寿命的明显改善。

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