Journal
ENGINEERING FRACTURE MECHANICS
Volume 263, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.108172
Keywords
Virtual grid-based stress recovery (VGSR); Stress intensity factor (SIF); Stress recovery; Unstructured and low-quality mesh
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2018R1A2B6007054]
- Korea Hydro & Nuclear Power Co., Ltd [2019-TECH-07]
- National Research Foundation of Korea [2018R1A2B6007054] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study proposes a virtual grid-based stress recovery technique for accurately computing stress intensity factors (SIFs) with arbitrary and low-quality meshes. The method reduces stress oscillation caused by low-quality elements and provides more accurate evaluation of SIFs for arbitrary and low-quality meshes.
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.
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