An elastic-perfectly plastic flow model for finite element analysis of perforated materialsperJones, D.P.perGordon, J.L.perHutula, D.N.perBanas, D.perNewman, J.B.US Department of Energy (United States)orgUnited States. Department of Energy.Bettis Atomic Power Lab., West Mifflin, PA (United States)West Mifflin, PennsylvaniaBettis Atomic Power Laboratory1999-02-01engThis paper describes the formulation of an elastic-perfectly plastic flow theory applicable to equivalent solid [EQS] modeling of perforated materials. An equilateral triangular array of circular penetrations is considered. The usual assumptions regarding geometry and loading conditions applicable to the development of elastic constants for EQS modeling of perforated plates are considered to apply here. An elastic-perfectly plastic [EPP] EQS model is developed for a collapse surface that includes fourth-order stress terms. The fourth order yield function has been shown to be appropriate for plates with a triangular array of circular holes. A complete flow model is formulated using the consistent tangent modulus approach based on the fourth order yield function.8 p.Plasticity36 Materials ScienceElasticityOrificesPlatesFlow ModelsMetals