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Title |
Determination of Crack Tip Position in a Bilinear Softening Model Using Coupled Experimental Observations and Numerical Analysis
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Authors |
모바헤디 나스타란(Nastaran Movahedi) ; 전시우(Siwoo Jeon) ; 주민관(Minkwan Ju) ; 한동석(Tong-Seok Han) ; 박경수(Kyoungsoo Park) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.4.541 |
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Keywords |
균열 선단 확인; 이선형 연화; 응집영역모델; 균열 입구 개구 변위 crack tip identification; bilinear softening; cohesive zone model; crack mouth opening displacement |
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Abstract |
This study presents a coupled experimental?numerical approach to identify the crack tip position on a bilinear softening model in concrete. Three-point bending tests of concrete specimens were conducted, and load?crack mouth opening displacement (CMOD) responses were measured at different stages of crack propagation (e.g., CMOD = 0.06, 0.12, and 0.24 mm). Crack paths were identified using a threshold-based image analysis, and crack lengths were measured for each stage. A two-dimensional finite element model with a predefined crack path and bilinear softening model was employed to simulate the concrete fracture process. Traction profiles along the crack path were evaluated and correlated with experimentally measured crack lengths. Based on this comparison, the position of the crack tip was identified as the kink point in the bilinear softening model, associated with the ratio of the initial and total fracture energies.
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