Evaluation of stress intensity factor for arbitrary and low-quality meshes using virtual grid-based stress recovery (VGSR). (15th March 2022)

• Record Type: Journal Article
• Authors: Choi, Habeun; Cui, Huiru; Park, Kyoungsoo
• Is Part Of: Engineering fracture mechanics. Volume 263(2022)
• Publication Date: 2022-03-15
• Subjects: Virtual grid-based stress recovery (VGSR) -- Stress intensity factor (SIF) -- Stress recovery -- Unstructured and low-quality mesh; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2021.108172
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: The use of the virtual grid-based stress recovery (VGSR) is proposed to accurately compute the stress intensity factors (SIFs). VGSR can be utilized for arbitrary and low-quality meshes in 2D and 3D. VGSR reduces errors associated with the numerical differentiation and the integral domain of J -integral. VSGR reduces the stress oscillation caused by low-quality elements and provides more accurate evaluation of SIFs for arbitrary and low-quality meshes. Abstract: To accurately compute the stress intensity factors (SIFs) with arbitrary and low-quality meshes, the use of the virtual grid-based stress recovery (VGSR) technique is proposed for both 2D and 3D fracture problems. A virtual grid is generated along the crack front to reduce errors associated with the numerical differentiation and the integral domain for J -integral. Based on the displacement and stress fields in the virtual grid, SIFs are evaluated using the domain integral method. The accuracy and convergence of VGSR are demonstrated by solving mode-I and mixed-mode examples. Computational results demonstrate that VSGR reduces the stress oscillation caused by low-quality elements and provides more accurate evaluation of SIFs for arbitrary and low-quality meshes.