Equivalent plastic solid materials of perforated plates based on effective stress ratio

Kasahara, Naoto*; Takasho, Hideki*; Kawasaki, Nobuchika ; Ando, Masanori 

The method to determine equivalent solid materials of perforated plates was proposed. One of difficulties of plastic analysis is dependency of their solutions on constitutive equations. To overcome this problem, plastic behaviors of perforated plate were systematically investigated on various kinds of constitutive equations. These studies have found existence of the effective stress ratio (ESR) which is defined as the stress ratio between average stress of perforated plates and solid plates of base materials. The ESR is a function of geometrical parameters and is independent from constitutive equations. Therefore, the ESR can determine plastic solid materials of perforated plates from any kind of constitutive equations of base materials.