芯棒锥面结构对孔冷挤压强化残余应力场的影响

发布时间：2018-04-20 09:20

本文选题：冷挤压 + 残余应力　；参考：《材料科学与工艺》2015年04期

【摘要】：为了在紧固孔周引入均匀的残余压应力,以延长紧固孔构件的疲劳寿命、提高其抗应力腐蚀性能,利用ANSYS有限元软件,建立了轴对称弹塑性有限元模型,对直接芯棒冷挤压强化过程进行了仿真,特别是对芯棒的前锥段曲线结构形式进行了设计与分析,研究了前锥段曲线形式对残余应力场分布的影响.结果表明:孔壁表面的周向残余应力分布复杂且不均匀,比较而言,外凸型正弦曲线型芯棒所产生的残余压应力沿孔壁深度方向分布更加均匀;几种曲线形式的芯棒在上表面近孔边区域均产生了径向残余拉应力,在孔的挤入段产生了轴向残余拉应力,但外凸型正弦曲线型芯棒在上述区域所产生的残余拉应力较小,且分布区域也较小.
[Abstract]:In order to introduce uniform residual compressive stress around the fastening hole in order to prolong the fatigue life and improve the stress-corrosion resistance of the fastening hole members, an axisymmetric elastic-plastic finite element model was established by using ANSYS finite element software. The reinforcement process of direct mandrel cold extrusion is simulated, especially the structure of the front cone curve of the mandrel is designed and analyzed, and the influence of the curve form of the front cone on the distribution of residual stress field is studied. The results show that the distribution of the circumferential residual stress on the surface of the hole wall is complex and uneven, and the residual compressive stress produced by the convex sinusoidal mandrel is more evenly distributed along the depth of the hole wall. Several kinds of curved mandrel have produced radial residual tensile stress in the upper surface near the hole edge, and axial residual tensile stress in the extrusion section of the hole, but the residual tensile stress of the convex sinusoidal mandrel in the above region is relatively small. The distribution area is also small.
【作者单位】：装甲兵工程学院装备再制造工程系;中国航空工业集团公司沈阳飞机设计研究所;
【基金】：北京市自然科学基金(3093027)
【分类号】：TG376

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