Study on Finite Element Analysis Considering Coupling of Material Failure and Structural Collapse

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The finite element analysis using constitutive equations based on continuum damage mechanics has made possible nonlinear analysis considering coupling of material failure and structural collapse, although there still remain some problems. The purpose of the present study is to develop a prototype program for coupled analysis of material failure and structural collapse, based on the research results concerning local approach to fracture.The following has been done to establish the procedure of locally-coupled approach. A program for elasto-viscoplastic analysis by ASI and 3-d finite element method has been completed, based on the existing results. This program gives the displacement and strain history by the analysis neglecting damage and determines the spot to be damaged. Then, an elasto-viscoplastic damage constitutive equation and its integrator program have been developed, considering ductile, brittle, creep, fatigue and environmental damage. This integrator gives the damage history of the damaged spot, based on which the creep and fatigue life can be determined.Next, the following has been done to establish the procedure of fully-coupled approach. A program for elasto-viscoplastic damage analysis by ASI and 3-d finite element method has been completed, introducing the established elasto-viscoplastic damage constitutive equation. The material failure and structural collapse are judged, based on the calculated history of stress, strain, displacement and damage. The global system has been completed by incorporating the parallel processing solver for large-scale analysis. The developed program has been applied to the fully or locally-coupled analysis of some structures and structural members. The validity of the program has been demonstrated by comparing the calculated results with the corresponding experimental results.