Session: MF-22-01 3D Crack Growth Simulation Using FEA

Paper Number: 106265

106265 - Accurate Evaluation of Stress Intensity Factor in 3d Arbitrary Unstructured Mesh Using Virtual Grid Based Stress Recovery 

For the accurate estimation of the stress intensity factor (SIF), the generation of a high-quality mesh along the crack front is of important, and thus a spider-web configuration mesh is generally employed in the finite element analysis. An automated mesh generation process with the spider-web configuration may be limited for the complex crack geometry, and thus the mesh generation can be a time-consuming task for various engineering problems. To evaluate SIF effectively and accurately for complex crack geometry, in this study, an arbitrary unstructured mesh is employed to easily discretize a complex domain, while SIF is accurately computed using the domain integral in relation with the virtual grid-based stress recovery (VGSR) technique. The displacement on the virtual grid is evaluated from the solution of the finite element analysis using the unstructured mesh, and then the stress and strain fields are recovered on the basis of the virtual grid. Computational results demonstrate that VGSR reduce stress oscillation resulted from low mesh quality while accurately computing SIF even under low-quality meshes. This is because VGSR can reduce errors of the numerical differentiation and integration associated with a low-quality mesh. One notes that the virtual grid is independent of the finite element analysis, and therefore, VGSR can be considered as a post-processing technique.

Presenting Author: Jongyeop Kim Yonsei university

Presenting Author Biography: Education
B.S., School of Civil and Environmental Engineering, Yonsei University, Republic of Korea, 2022

Employment
Research Assistant, School of Civil and Environmental Engineering, Yonsei University, Mar. 2022 - Present
Undergraduate Intern, School of Civil and Environmental Engineering, Yonsei University, May. 2021 - Feb. 2022

Authors:

Jongyeop Kim Yonsei university
Habeon Choi Korea Atomic Energy Research Institute
Kyoungsoo Park Yonsei University