RESEARCH ON INFLUENCE OF CRACK LENGTH ON TEST VALUES OF ROCK DYNAMIC FRACTURE TOUGHNESS
ZHANG Sheng1，WANG Qizhi2，LIANG Yalei1
(1. College of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454001，China； 2. Department of Civil Engineering and Applied Mechanics，Sichuan University，Chengdu，Sichuan 610065，China)
Abstract：In order to study the influence of crack length on test values of rock fracture toughness，one-size holed-cracked flattened Brazilian disc of marble specimen with diameter of 80 mm and specimens of different cracks lengths were performed with split Hopkinson pressure bar system. The strain waves in elastic bar and fracture mode of specimens with different crack lengths were obtained；and the dynamic fracture toughness of marble were determined by experiment-numerical analysis. It is shown that the average dynamic fracture toughness is 2.6 times larger than the average static one under average loading rate of 2.96×104 MPa·m1/2·s－1；and the dynamic fracture toughness test values do not vary with crack lengths significantly compared to the static one. Moreover，the method to determine dynamic fracture toughness independent of size and configuration is discussed.
张盛，王启智，梁亚磊. 裂缝长度对岩石动态断裂韧度测试值影响的研究[J]. 岩石力学与工程学报, 2009, 28(08): 1691-1696.
ZHANG Sheng1，WANG Qizhi2，LIANG Yalei1. RESEARCH ON INFLUENCE OF CRACK LENGTH ON TEST VALUES OF ROCK DYNAMIC FRACTURE TOUGHNESS . , 2009, 28(08): 1691-1696.
