Critical Conditions of Wrinkling in Deep Drawing of Sheet Metals : 3 rd Report, Prediction of Critical Blank-Holding Pressure

概要

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In this report, the validity of the prediction formula is checked by experiments as much in detail as possible. Consequently, the formula has been found satisfactory to predict the critical blank-holding pressure necessary for obtaining a product in which "local wrinkles"remain. And also, it has been experimentally confirmed that the value of the allowable specific wave amplitude ω_<cr> to be introduced into the formula is a constant nearly equal to the specific wave amplitude of wrinkles which arise locally in the flange. To predict the critical blank-holding pressure necessary for obtaining a product in which"trace of wrinkles"remains or"no wrinkles"remain, a multiplier ω_B or ω_A should be applied to the formula instead of ω_<cr>.
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