Determination of ductile crack tearing initiation in a cracked branch pipe with a criteria determined on CT specimen

摘要

This article deals with an experimental and numerical analysis on crack tearing initiation conditions in a ferritic steel. For that, a criteria called J{sub}i is determined experimentally on a 25 mm thickness CT specimen. it is discussed,numerically and experimentally, in the case of a thinner CT specimen. A methodology to determine the criteria on a small specimen is then proposed.The criteria is then applied on a cracked Tee junction submitted to an out of plane bending, to compare the estimations of the load at tearing initiation and values measured during the test. The comparison is very good: the criteria is predictive.