DEPENDENCE OF PREDICTION MODEL OF FORMING LIMIT STRAINS　ON　FORMING METHOD AND MECHANICAL PROPERTIES OF SHEET METALS

来源期刊：中国有色金属学报(英文版)1997年第1期

论文作者：Zhou Weixian

文章页码：52 - 56

Key words：forming limit strains ;prediction model ;forming method ;mechanical properties

Abstract: Taking into account the deformation characteristics of sheet metal forming under punch or fluid pressure by means of the states of tension compression strains or biaxial tension strains, the possibility of development of the tensile instable deformation to localized necking deformation was analysed using the principle of minimum strain energy. It was found that this is impossible when the sheet metals are deformed by means of fluid pressure in the biaxial tension mode, and possible in other deformation conditions, but the possibility of breaking before the localized necking occurs due to the insufficient deformation ability of materials should be noted. Therefore, the choice of either localized necking type model or breaking type model for predicting the forming limit strains must be determined in the light of actual conditions.