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박현규(Hyun Kyu Park),임홍섭(Hong Sup Im),이혜경(Hyae Kyung Yi),김광순(Kwang Soon Kim),문영훈(Young Hoon Moon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In recent years, developments of light weight vehicle are one of the most important issues in automotive industry. It is important to know the variations of the mechanical properties in the hydro forming process for the safe and durable design purposes. Generally, tube hydro forming process consists of three main processes such as bending, preforming, and hydro forming. It means that the strain hardening histories of final products are nonlinear. In this study, strain hardening behavior during hydro forming has been investigated by hydroforming of engine cradle as a model process. The variation of mechanical properties such as local hardness and strength were used as an index of strain hardening during respective processes. The correlationship between strength and hardness obtained from tensile test at various pre-strain conditions has been equivalently converted into correlation between hardness and pre- strain.