Analysis of Three-dimensional Surface Cracks in a Welded Joint Structure Using the Shell-Solid Mixed Method

作者：Tanaka Satoyuki^*; Okazawa Shigenobu; Okada Hiroshi; Xi Yang; Ohtsuki Yasuaki

来源：International Journal of Offshore and Polar Engineering, 2013, 23(3): 232-239.

• Finite element method
• fracture mechanics analysis
• shell-solid mixed model
• welded joint
• stress intensity factor

We present a new approach to calculate stress intensity factors of three-dimensional surface cracks in welded joints of a ship structure. We analyze problems involving very different length scales, using a shell-solid mixed finite element model. In this technique, the shell element model is used on the whole ship structure, and the solid element model is adopted for the part of the welded joint with a three-dimensional surface crack. The solid model is constituted of the quadrilateral tetrahedral elements. The shell model and the solid model are connected using the semi-auto RBE3 connecting technique, which enhances the tractability of the shell-solid mixed modeling. The Virtual Crack Closure-Integral Method for the tetrahedral finite element method is used to calculate the SIFs of the surface crack. In this paper, the numerical approach and the application are demonstrated.

• 出版日期2013-9