Fracture Toughness of SE(B) Specimens of Steel in the Presence of Splitting
Instabilities (pop-ins) in load-displacement records of fracture tests could be originated from small unstable crack growth in the main crack plane,as usual in welded joints,or from delamination of the ligament (splitting),as in some rolled steels.According to the standards,no matter the origin of the instability the fracture toughness need to be reported at the first significant pop-in.In most cases this treatment greatly penalizes the fracture toughness of the material.In that way a question arose: What would be the fracture toughness of a material featuring splitting if the specimen were not suffered split? To answer this question several test were made in rolled steels showing and not pop-ins from splitting.It is being now proposed that the change in the system energy associated to splitting instabilities could be neglected,the records corrected by adding the load drop caused by the split to the points on the right,and the toughness calculated at the maximum load.The results (for the magnitude of the instabilities we faced) showed that maximum load CTOD from corrected records and from records of the same material without pop-ins by splitting are statistically equivalent.
Pop-in Split-Out Fracture Toughness Rolled Steel
Pablo J. Lara Melcher Enrique M. Castrodeza
Laboratory of Fracture Mechanics,Department of Metallurgical and Materials Engineering,COPPE/Federal University of Rio de Janeiro,P.O.Box 68505,21941-972,Rio de Janeiro,RJ,Brazil
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）