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A novel procedure is proposed, which improves an earlier one, to determine the critical value of the J-integral at high loading rates. A more detailed analysis of such a test along with some experimental results has been published elsewhere. The present procedure is based on ASTM Test for JIc, a Measure of Fracture Toughness (E 813). To perform the impact test, the split Hopkinson pressure bar concept is used together with the wedge-loaded compact tension specimen (WLCT).
This paper provides a better understanding of the proposed procedure by a more accurate analysis of the frictional effects which occur between the loading wedge and the WLCT specimen. In addition, a unique procedure has been developed to measure the coefficient of Coulomb friction in the real environment of fracture KIc or JIc tests.
Visiting Professor, Laboratoire des Sciences des Matériaux de la Mécanique,
Stock #: JTE10979J