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FORCEMATE HIGH INTERFERENCE FIT BUSHING INSTALLATION FOR ENHANCED FATIGUE LIFE AND STRUCTURAL INTEGRITY

机译:用于提高疲劳寿命和结构完整性的高抗干扰配合套管安装

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The ForceMate process is used to cold expand bushings into structure at a high interference fit as an alternative to traditional freeze fit methods. This paper details the process and the residual stress distribution induced around the bushing that improves the fatigue life and damage tolerance of the installation. Residual stresses are calculated using advanced finite element analysis (FEA) software developed for non-linear problems. FEA simulates the dynamics of the cold expanded bushing installation method in three dimensions including the interaction of the complex applied and resultant residual stress distribution around the hole. Models are compared to strain gauge data from coupons and residual stress measurements using x-ray diffraction. Different parameters, such as applied expansion, bushing/parent material combinations, and geometry constraints, that influence the installation are discussed along with how the numerical derivation of residual stresses can be utilized to optimize the process and design details to minimize the iterative testing required to certify the installation parameters.
机译:用于冷却衬套的剥离过程以高冻干方法的替代方案冷却套管成结构。本文详细说明了衬套周围诱导的过程和残余应力分布,从而提高了安装的疲劳寿命和损坏容差。使用用于非线性问题的先进有限元分析(FEA)软件来计算残余应力。 FEA在三个尺寸中模拟冷膨胀套管安装方法的动态,包括复合物的相互作用和孔周围的残余应力分布。将模型与来自优惠券的应变计数据进行比较,并且使用X射线衍射的残余应力测量。不同的参数,例如应用扩展,衬套/父材料组合和几何约束,其影响安装的不同的参数,以及如何利用剩余应力的数值推导来优化过程和设计细节以最小化所需的迭代测试证明安装参数。

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