Lee, Yi-CheYi-CheLeeChen, Fuh-KuoFuh-KuoChen2008-10-282018-06-282008-10-282018-06-28200009240136http://ntur.lib.ntu.edu.tw//handle/246246/85619https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033702401&doi=10.1016%2fS0924-0136%2800%2900506-9&partnerID=40&md5=66be487be1a956cf7161f8147d7a48d5The plastic behavior of a perforated sheet with round holes in a triangular pattern depends largely on the hole size of the perforated sheet. This study investigates the plastic behavior of perforated sheets with low ligament ratios. A yield criterion for the perforated sheets is also proposed in terms of apparent stresses by employing the equivalent-continuum approach. The effectiveness of the proposed yield criterion is then demonstrated by comparing the predicted values of apparent yield stresses and apparent strain ratios with results obtained from finite-element analysis and experiment.application/pdf390996 bytesapplication/pdfen-USContinuum mechanics; Finite element method; Plasticity; Yield stress; Equivalent continuum; Ligament ratio; Perforated sheets; Perforatingjournal article10.1016/S0924-0136(00)00506-92-s2.0-0033702401http://ntur.lib.ntu.edu.tw/bitstream/246246/85619/1/17.pdf