A new method for measuring dynamic fracture toughness of rock

✍ Scribed by Chunan Tang; Xiaohe Xu

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 669 KB
• Volume: 35
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(90)90162-a

✦ Synopsis

An experimental technique for studying dynamic fracture toughness under stress wave loading is described in this paper. With a Bar Impact Testing Machine, the three point bending specimen was fractured under impact loading, the loading rate K, being approximately lo6 N/mm3'2. s. An accurate measurement of load and groove-opening displacement as function of time was made by applying a transient waveform storage, and the load applied on the specimen and the groove-opening displacement can be determined from the displacement rate according to which the dynamic fracture toughness Kid was obtained. The typical load-displacement curve of a marble specimen with size of 180 x 40 x 40 is given in the paper.