干涉配合紧固件孔的弹塑性工程分析

本文根据厚壁筒概念,以平面应变、有限边界情况和理想塑性材料的假定,对铆接或螺接干涉配合紧固件孔边的应力场进行了弹塑性工程分析,给出了便于分析使用的计算弹性配合的极限干涉量,塑性配合的塑性区半径,弹、塑性区内的径向和周向应力分布等参数方程式,这些参数和参数方程式对紧固件孔的疲劳设计和生产工艺都具有十分重要的意义。 应用分析说明了铆距和耳片外边界半径对所得结果的影响,以及平面应变和理想塑性材料与平面应力和幕强化塑性材料假定对于孔边应力分布的影响。

An Elastoplastic Engineering Analysis on Fastener Holes of Interference-Fit

According to the idea of thick wall cylinder, the stress distribution around the fastener holes of interference-fit rivet and bolt joints is analyzed in an elastoplastic engineering view under the assumptions of plane strain, finite boundary condition and ideal plastic material. The parameters and the parametric equations of the interference limit quantity of elastic fit, the radius of plastic zone of plastic fit, and the radial and circumferential stress distribution within the elastic and plastic zones etc. are given in this paper. These parameters and parametric equations are not only convenient in analysis and calculation but also important in fatigue design and process technology.The effect of the rivet pitch and the outside boundary radius of the lug upon the results obtained is made clear through the analysis. The effects upon the stress distribution around the holes resulted from the assumptions of plane strain and ideal plastic material, and the plane stress and plastic material exponentially strengthened are also explained.