Journal
ENGINEERING FRACTURE MECHANICS
Volume 204, Issue -, Pages 87-102Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2018.09.034
Keywords
Dynamic fracture toughness; High temperature; DEM; SHPB; Granite
Categories
Funding
- National Natural Science Foundation of China, China [51774325]
- State Key Program of National Natural Science Foundation of China, China [41630642]
- State Key Research Development Program of China, China [2016YFC0600706]
- Hunan Provincial Natural Science Foundation of China, China [2017JJ3389]
- Innovation-Driven Project of Central South University, China [2017CX006]
- Fundamental Research Funds for the Central Universities of Central South University, China [2018zzts733]
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With the limitations of measuring techniques, limited investigation on dynamic fracture testing of rocks at high temperature is reported. In this paper, an effective measuring method of the dynamic mode I fracture toughness of high-temperature rocks, combined with laboratory tests with the Discrete Element Method (DEM), is proposed. Based on the laboratory experiments conducted, including uniaxial compressive tests under different temperature conditions, the Brazilian test and split Hopkinson pressure bar (SHPB) test, the micro-parameters of the numerical model are calibrated and the validity of the numerical model of specimens and the simulated dynamic load tests are examined. The results show that the DEM can truly reflect the mechanical properties of rocks at high temperatures, and the simulation test can capture the dynamic fracture parameters of rocks at elevated temperatures. The test data indicates that the fracture initiation toughness of specimens increases linearly with the loading rate, while the fracture initiation time detected by the measurement circle near the notch tip decreases. When the loading rate is higher than 130 GPa m(1/2)/s, the fracture initiation toughness has a significantly negative relationship with the temperature within the temperature range of 25-400 degrees C.
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