抄録
A numerical method to analyze a one-point-bend specimen with a fast propagating crack was developed using the Timoshenko beam theory. The displacement and the dynamic stress intensity factor can be obtained by this method if the time histories of the impact force and crack velocity are given. A numerical simulation of the one-point-bend impact test was carried out using the above method and the Hertz theory of contact. The time dependence of impact force (and hence the dynamic stress intensity factor) can be calculated if the impact velocity and the time history of crack velocity are given. The possibility of measuring the fast crack propagation toughness using a one-point-bend impact test machine was discussed.
