STRUCTURAL FINITE-ELEMENT ANALYSIS WITH NEW INTERFACE MODEL

The constitutive model of interface behavior in quasi-brittle material s developed by the writers is incorporated with the finite-element met hod. The procedure and problems about the formulation of interface ele ment are analyzed in detail. The three-term recursive equation is modi fied to ensure the convergency of the dynamic relaxation process in th e softening stage of the present study. A simple way of realizing the prescribed displacement constraint conditions is suggested for the dyn amic relaxation iterative process. A finite-element code, SANIM (Struc tural Analysis with a New Interface Model), which can be used in quasi -brittle material structure analysis for different purposes, is develo ped. Numerical results were compared favorably with the experimental r esults of a rock salt specimen under direct tension.