Compressive Impact Strength of High Temperature Gas-cooled Reactor Graphite

Abstract

To investigate the effect of strain rate on fracture behavior for coarse grained nuclear graphite, PGX, a hydraulic servo type impact testing machine has been constructed and compressive impact strength test was performed at various strain rates up to more than 100 (1/s). From the results, the following conclusions were derived.(1) Compressive impact strength of graphite increases with increasing of strain rate in the range of 10-3 to 100 (1/s).(2) Compressive impact strength decreases drastically for strain rates more than 100 (1/s).(3) Compressive impact strength dose not depend on specimen volume.