Abstract
A comprehensive plane stress finite element study is made for reduction of stress concentration factor (SCF) in a uni-axially loaded infinite width rectangular isotropic/orthotropic plate with central circular hole. The finite element formulation was carried out by the analysis section of the package ANSYS. With the help of present work, stress concentration can be reduced up to 24.4 % in an isotropic and 31 % in an orthotropic plate by introducing four coaxial auxiliary holes on either side of main hole. The study reveals that the introduction of these holes helps to smooth flow of the tensile stress past the main hole and result a reduction in stress concentration factor. With such reduction in maximum stress levels, the improvement in fatigue life of a component can be significant.
Highlights
An infinite width rectangular isotropic/orthotropic plate with central circular hole have found widespread applications in various fields of engineering such as aerospace, marine, automobile and mechanical
The reduction in stress concentration factor (SCF) depends on diameter and position of auxiliary holes in isotropic or orthotropic plates, two parameters X/D and D1/D in model B and three parameters X/D, D1/D and D2/D in model C influence the reduction in SCF
For an isotropic plate; in case of model C, maximum reduction in SCF is achieved for X/D=1.2 as 24.39 %, where, in case of model B, maximum reduction in SCF is achieved for X/D=1.2 as 18.39 % only
Summary
An infinite width rectangular isotropic/orthotropic plate with central circular hole have found widespread applications in various fields of engineering such as aerospace, marine, automobile and mechanical. Meguid [1] presented a technique for reducing stress concentration factor by introducing defence hole system in a uni-axially loaded plate with two coaxial holes by finite element method, where reduction in SCF ranging from 7.5 to 11 % maximum have been achieved. Giare et al [2] presented a method for the reduction of stress concentration around the main hole in an isotropic plate by using a ring of composite material around the main hole, method is not suitable for all designing conditions and no techniques were presented for reduction in SCF for orthotropic plate. In general stress concentration factor can be reduced up to 12-18 % by two coaxial auxiliary holes on either side of the main hole, to achieve the maximum possible reduction; these auxiliary holes are to be introducing very near to the original hole, which is not practically possible. This study will provide guidelines technique to designer for reduction of stress concentration up to maximum level
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