Verification of effective thicknesses for side-grooved compact specimens

✍ Scribed by Kunigal N. Shivakumar; James C. Newman Jr.

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 624 KB
• Volume: 43
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(92)90125-x

✦ Synopsis

Three-dimensional elastic-plastic finite element analyses of smooth and 25% side-grooved compact specimens were conducted to verify the effective thicknesses used in the ASTM E-8 13 J-R curve testing procedure. The analysis showed that the current effective thickness definitions used in E-813 for calculating the elastic stress intensity factor, B, = J(BB,), and the plastic component of the J-integral, II, = BN, are accurate, where B and BN are the nominal specimen thickness and thickness at the crack plane, respectively. The effective thickness, 8, = B{ 1 -(1 -B,,,/S)*}, used in E-813 overestimates the compliance by about 7%. This error could be reduced to less than 1% if the effective thickness is taken as equal to the specimen total thickness, B, = B.