EFFECT OF SINGLE OVERLOAD ON STRESS DISTRIBUTION IN AN AXIALLY LOADED 2024-T351 ALUMINIUM ALLOY PLATE SPECIMEN WITH A HOLE
Keywords:
finite element. overloading, hole. elastic and plastic stress concentrations, residual stresses, plasticity, stresses at hole edge. modelAbstract
In the present investigation. overloading of 2024-T351 aluminium alloy plate of 6.40 min thick
with 6 min diameter hole has been studied by means of a two-dimensional finite element (FE)
analysis under plane' stress condition. The material for the analysis is assumed to be isotropic,
and von Mises failure criterion with linear isotropic hardening is incorporated. The residual
stress fields around the hole edge have been obtained for an overload range of 33.9% to 99% of the yield stress. Tbe results indicate that there exisls a large amount of compressive tangential residual stress around the hole edge. Reverse yielding was observed for an overlooding CJoL > 75% which is responsible for reducing the extent of compressive residual stresses around the hole edge. The elastic-plastic finite element analysis shows that there is a significant reduction of stress concentration foctor with overloading. A model is also developed giving tangential residual stress at the hole edge for a given overload.
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