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Abstract
The semi-circular bend (SCB) specimen is widely used to measure fracture toughness of brittle materials such as rock. In this work, the stress field, fracture process zone (FPZ), and crack propagation velocity of SCB specimen are analyzed during the fracture process of rock specimens. The FPZ of specimen is obtained by experimental and numerical methods under a three-point bend test. The stress concentration zones of specimen present a heart shape at peak load points. FPZ forms before macro fracture occurs. The macro fracture form inside FPZ in a post-peak region of a load–displacement curve. The crack propagation process of specimen include two stages, namely the rapid crack initial development stage, and the final crack splitting stage. The maximum crack propagation velocity of specimen is about 267 m/s, and the average crack propagation velocity is about 111 m/s.
Highlights
Introduction of Rock by SemiCircular BendFracture toughness is defined to describe the capacity of materials to resist crack propagation, which include three categories under different loading statuses [1]
There is an angle at the notch tip to ensure that the crack initiation position is in the center of tip because the model size can be accurately determined by coordinates
Based on the above consideration, semi-circular bend (SCB) specimens under mode I condition are studied by both the laboratory test and the FDEM numerical method
Summary
Fracture toughness is defined to describe the capacity of materials to resist crack propagation, which include three categories under different loading statuses [1]. Since the semi-circular bend (SCB) specimen is easy to fabricate and is convenient to test, it has been suggested to determine mode I fracture toughness by the International Society for Rock Mechanics [11]. It is widely used in testing fracture toughness of brittle materials such as rock. Based on the above consideration, SCB specimens under mode I condition are studied by both the laboratory test and the FDEM numerical method. The FDEM numerical method is adopted to further reveal details such as the stress field, fracture process zone, and crack propagation velocity, which are difficult obtained in laboratory tests
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