Development in the instrumented impact test - computer aided instrumented impact testing system

摘要

To determine the toughness of materials, Charpy V notch test has been widely utilized over the world. This method is easy to conduct, but obtained values are very qualitative. Instrumented test has also a long history and gives us a loading history during impact. However this method is also still remaining in a range of screening test. Using a precracked specimen, it is possible to estimate dynamic fracture toughness K{sub}d, but there are many problems accompanying with measurements. Oscillations and size effect are most troublesome ones. The author has successfully developed CM Computer Aided Instrumented Impact Testing) System for the evaluation of dynamic fracture toughness. In this CAI system, dynamic fracture toughness parameters such as K{sub}d, J{sub}d, T{sub}(mat), and various absorbed energies can be obtained from regarding the load-deflection curve of a single precracked specimen for both ductile and bristle materials. The details and validity of this procedures are shown and discussed.