期刊
ENGINEERING FRACTURE MECHANICS
卷 258, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2021.108053
关键词
Tungsten heavy alloys; Dynamic fracture toughness; Rate-dependent cohesive law; Semi-circular bend; Finite element analysis
类别
资金
- National Natural Science Foundation of China [51775457, 51875487]
Semi-circular bend specimens are used to measure the fracture toughness of brittle materials, with experiments on tungsten heavy alloy showing an increase in dynamic fracture toughness with loading rate. A rate-dependent bilinear traction-separation law is introduced to explain the dynamic fracture behaviors of tungsten alloy.
Semi-circular bend specimens are used to measure the brittle materials' fracture toughness, such as brittle metals, rocks, and ceramic materials. The quasi-static and dynamic model I fracture toughness of tungsten heavy alloy, a typical brittle metal material, are measured using the semicircular bend specimens under quasi-static compression and dynamic impact loadings. For quasistatic cases, the specimens are loaded on a universal testing machine with a constant loading speed. While for dynamic cases, the specimens are executed on a modified split Hopkinson pressure bar system with the impact pressures from 0.2 to 0.4 MPa. The results show that the dynamic fracture toughness of tungsten alloy increases with the increase of the loading rate. Further, a rate-dependent bilinear traction-separation law is introduced to explain the dynamic fracture behaviors of tungsten alloy. The parameters of the rate-dependent law are obtained from the experiments and the finite element simulations. Finally, the dynamic simi-circular bend simulations using the cohesive element with rate-dependent cohesive law are established to simulate the crack propagation, and the simulation results are in good agreement with the test data.
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