A new formulation of the modified maximum force criterion (MMFC)

摘要: In the paper authors propose an improved version of Modified Maximum Force Criterion (MMFC) initially developed by Hora and his co-workers. The most appealing characteristic this model is fact that no assumptions related to existence voids or other defects are needed. MMFC based on hypothesis a plane-strain state develops during localized necking. Due stress change, there additional hardening effect, which ‘hesitates’ out improvement proposed in frame consists adding two material constants model. Their values determined enforcing couple experimental constraints way, quality theoretical predictions can be improved. As proven numerical tests, appropriate necking occurrence plane strain biaxial tension, respectively. By controlling these points FLD, discrepancies between Hora’s experiments minimised. If data available, could generated using some for FLD determination (e.g., empirical formulas Marciniak Kuczynski). performances new evaluated comparing its with criterion FLD’s corresponding different sorts sheet metals.