Abstract
The validity of the newly developed CAI system ( C omputer A ided I nstrumented Charpy Impact Testing System ) for the evaluation of the dynamic elastic-fracture toughness parameters, i.e. the dynamic crack initiation toughness ( K Id , J Id ) and growth toughness ( J R curve, tearing modulus: T mat ) was investigated in various materials such as steel, aluminum alloy, titanium alloy, cast iron and so on. The dynamic elastic-plastic fracture toughness parameters ( J Id and T mat ) values in various materials could be easily obtained from the single load-deflection curve of the precracked specimen using the CAI system. The introduction of the side grooves was found to be effective to obtain the valid J Id value using the standard size Charpy specimen. In addition, the strain rate dependency of the specimen compliance ( C 3 ), and the effect of the specimen size on J d value and impact velocity on the geometry of the load-deflection curve were studied.
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