<FONT face=Verdana>裂缝长度对岩石动态断裂韧度测试值影响的研究</FONT>

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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.

Key words： rock mechanics split Hopkinson pressure bar(SHPB) holed-cracked flattened Brazilian disc(HCFBD) rock dynamic fracture toughness crack length marble

Received: 24 April 2009

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http://www.rockmech.org/EN/ OR http://www.rockmech.org/EN/Y2009/V28/I08/1691