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2026 Vol.39, Issue 3 Preview Page

Research Paper

Mixed-Mode Stress Intensity Factor Evaluation Using the Virtual Grid Stress Recovery (VGSR) and Adaptive Mesh Refinement

가상격자 응력복원(VGSR) 방법과 적응적 요소 세분화를 이용한 혼합모드 응력확대계수 평가

Nastaran Movahedi1
,
Siwoo Jeon1
,
Kyoungsoo Park2*
모바헤디 나스타란1
,
전 시우1
,
박 경수2*
1Graduate Student, Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
2Professor, Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
1연세대학교 건설환경공학과 대학원생
2연세대학교 건설환경공학과 교수
*Corresponding Author
30 June 2026. pp. 193-200
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Abstract

This study presents a combined approach to improve the accuracy of mixed-mode stress intensity factor (SIF) evaluation, which uses the virtual grid stress recovery (VGSR) technique and adaptive mesh refinement. The VGSR method is used to generate a smoother and more accurate stress field by interpolating finite element displacements from unstructured elements onto a structured virtual grid, thereby reducing errors associated with an integral domain in SIF evaluation. To improve the accuracy of the underlying displacement field, adaptive remeshing based on von Mises stress is performed in two successive steps using Abaqus. The method is applied to an inclined penny-shaped crack in mixed-mode, where SIFs are computed using the interaction integral. The results show that two-step adaptive refinement significantly improves SIF accuracy, demonstrating the effectiveness of combining VGSR with adaptive meshing for linear fracture analysis.

Keywords
stress intensity factor (SIF)
mixed-mode fracture
virtual grid stress recovery (VGSR)
adaptive mesh refinement
interaction integral (I-integral)

본 연구에서는 혼합모드 응력확대계수 평가의 정확도를 향상시키기 위해 가상 격자 응력 복원(Virtual Grid Stress Recovery, VGSR) 기법과 적응적 요소 세분화를 결합한 접근법을 제시한다. VGSR 방법은 비구조화된 유한요소의 변위장을 구조화된 가상 격자에 보간함으로써 보다 매끄럽고 정확한 응력장을 생성하고, 응력확대계수(SIF) 평가에서 적분 영역과 관련된 오차를 감소시킨다. 변위장 품질을 향상시키기 위해 Abaqus를 이용하여 von Mises 응력을 기반으로 두 단계의 적응적 요소 세분화를 수행하였다. 제안된 방법은 혼합모드 하중을 받는 경사진 penny-shaped crack에 적용되었으며, 응력확대계수는 I-적분(interaction integral)을 통해 계산되었다. 결과는 두 단계의 적응적 세분화가 응력장 품질과 응력확대계수의 정확도를 크게 향상시킴을 보여주며, VGSR과 적응적 요소 세분화 기법의 결합이 파괴 해석에 효과적임을 입증한다.

키워드
응력확대계수
혼합모드 파괴
가상 격자 응력 복원
적응적 요소 세분화
I-적분(interaction integral)
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 39
  • No :3
  • Pages :193-200
  • Received Date : 2026-05-11
  • Revised Date : 2026-05-22
  • Accepted Date : 2026-05-26
  • DOI :https://doi.org/10.7734/COSEIK.2026.39.3.193
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