Analysis of Welded Tubular Connections Using Continuum Damage Mechanics

Abstract

A new modeling technique for the ultimate strength analysis of welded tubular connections subjected to general loading is presented. Based upon the finite element method, the model includes shell and solid elements, large deformations, and elastoplasticity. Unlike other approaches, the ability to simulate the initiation and propagation of fracture is included through the application of continuum damage mechanics (CDM). With this method, cracking is predicted on the basis of a damage variable, and its effect is applied as a reduction in the element stiffness. The development of the material constants is described and numerical results are obtained for two tubular joints that exhibit fracture failure. A comparison between the computed failure loads and those observed experimentally shows a close correlation. With this approach, welded connections that are subjected to arbitrary loading can be efficiently evaluated for strength.