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3D internal crack propagation in brittle solids under non-uniform temperature field: Experimental and numerical simulation
  • +3
  • Li Xiangyu,
  • Wang Haijun,
  • Tang Lei,
  • Chang Hongfei,
  • Wang Yun-fei,
  • Yu Yi
Li Xiangyu
China University of Mining and Technology
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Wang Haijun
Nanjing Hydraulic Research Institute

Corresponding Author:[email protected]

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Tang Lei
Nanjing Hydraulic Research Institute
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Chang Hongfei
China University of Mining and Technology
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Wang Yun-fei
Nanjing Hydraulic Research Institute
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Yu Yi
Nanjing Hydraulic Research Institute
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Abstract

:Thermal fracture is a common problem in engineering. Traditional studies mainly addressed surface crack propagation, with limited research on 3D internal crack propagation. This paper uses the 3D-ILC method to fabricate 3D internal cracks of different positions within semi-disc specimens. Physical experiments, numerical simulations and fracture morphology analysis were conducted on the propagation of 3D internal cracks under non-uniform temperature fields. The results indicate the following: 1) In physical experiment, different crack propagation modes were observed in group A at different heights, including “n-shaped” and “u-shaped” cracks, while group B formed the “s-shaped” cracks. 2) In numerical simulation, the crack propagation length and deflection angle for crack tips on both sides are different of the same specimen in group B. The K of the internal cracks in group B cannot be overlooked, consistent with the location of the “lance-like” fracture observed in the physical experiments. 3) In fracture morphology, group A cracks have smooth fracture surfaces, which are mode I-II mixed cracks, while group B cracks show lance-like fracture, considered mode I-II-Ⅲ mixed cracks. The results provide an experimental and theoretical basis for the study of 3D internal crack propagation patterns under non-uniform temperature fields.