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Estimation of plastic stress concentration factor around elliptical cut outs

机译:椭圆形切口周围塑性应力集中系数的估计

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摘要

Design of structures needs to cater to key requirements of safety and weight. To achieve these requirements, smooth flow of stresses and optimum factor of safety at all points in the structure are necessary. However, presence of cut outs becomes a necessary feature in the structures which obstruct the flow of stresses and there will be local concentration of stresses near the cut outs which needs to be estimated so that a safe and weight efficient design may be worked out. In this work, stress concentration factors (both elastic and plastic) near the elliptical cut outs of various standard geometries and for different material are computed using FEA and a comparison is made with analytical and semi-empirical methods available which demonstrates the behaviour of the structures with cut outs in the plastic regime. The ratio of nominal stress at failure to the ultimate strength of the material is calculated for the different plastic stress concentration factors for all the elliptical cut out configurations and a comparison is made between the theoretical and FEM results.
机译:结构设计需要满足安全性和重量的关键要求。为了达到这些要求,必须在结构中的所有位置平稳地传递应力并获得最佳的安全系数。然而,切口的存在成为阻碍应力流动的结构中的必要特征,并且在切口附近将局部存在应力集中,需要对其进行估计,以便可以设计出安全且重量轻的设计。在这项工作中,使用有限元分析法计算了各种标准几何形状的椭圆形切口附近和不同材料的应力集中系数(弹性和塑性),并使用分析和半经验方法进行了比较,以证明结构的性能。与在塑料政权切口。针对所有椭圆形切口构造,针对不同的塑性应力集中系数,计算了破坏时的标称应力与材料的极限强度之比,并对理论结果与有限元结果进行了比较。

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