Experimental T33-stress formulation of test specimen thickness effect on fracture toughness in the transition temperature region

✍ Scribed by Toshiyuki Meshii; Tomohiro Tanaka

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 660 KB
• Volume: 77
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/j.engfracmech.2010.01.014

✦ Synopsis

This paper describes a study of the test specimen thickness effect on fracture toughness of a material, in the transition temperature region, for CT specimens. In addition we studied the specimen thickness effect on the T 33 -stress (the out-of-plane non-singular term in the series of elastic crack-tip stress fields), expecting that T 33 -stress affected the crack-tip triaxiality and thus constraint in the out-of-plane direction. Finally, an experimental expression for the thickness effect on the fracture toughness using T 33 -stress is proposed for 0.55% carbon steel S55C. In addition to the fact that T 33 (which was negative) seemed to show an upper bound for large B/W, these results indicate the possibility of improving the existing methods for correlating fracture toughness obtained by test specimen with the toughness of actual cracks found in the structure, using T 33 -stress.