Methodology for determining the radial fracture toughness of ZrNb pressure tube material

✍ Scribed by E. Smith

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 382 KB
• Volume: 48
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(94)90192-9

✦ Synopsis

With regard to the determination of the radial fracture toughness of Zr-Nb pressure tube material, using a curved bend specimen machined from a pressure tube, a theoretical analysis shows that one can use the same relation to give the initiation J value as is used for pure bending of a small remaining ligament, namely * ,. J=;

PdA., J where B is the specimen thickness, 6 is the ligament width, P is the load and A is the load-line displacement; the integration is performed up to the onset of crack extension. With the curved specimen, this relation should give an initiation J value that is never more than 4% greater than the true J value for b/r < 0.6 where r is the tube thickness; it should in fact underestimate the initiation J value with a very ductile material.