Fracture Toughness Evaluation of Ductile Munitions Material

摘要

It has been difficult to obtain fracture toughness data from actual artillery projectiles due to the stringent size requirements imposed by linear elastic fracture mechanics. This difficulty could be alleviated by an elastic-plastic stress analysis to determine the fracture toughness. The J-integral offers the most promising solution to this problem. Before applying the J-integral to projectile problems, one must determine if the results of the J-integral will be equivalent to those obtained from the standard K-test using projectile steel. The material chosen for this study was 1340 steel heat treated to 1035 MPa (150,000 psi) yield strength.