EVALUATION OF SHEAR FRACTURE PROPAGATION PROPERTY AND INFLUENCE OF SEPARATION IN HIGH STRENGTH LINE PIPE.

Abstract

High Strength Line Pipe Research Committee of the Iron and Steel Institute of Japan conducted full scale burst tests with air pressure of 12. 0 MPa on pipes of 48 in. diameter and 0. 720 in. wall thickness of API grade X 70 made with both controlled rolled steels and quenched and tempered steels. The critical Charpy energy for arresting shear fracture depends on the distance in which the crack should be arrested, and this phenomenon is explained by solving the equation which governs the change in crack velocity.