Numerical evaluation of a 3-D J-integral and comparison with experimental results for a 3-Point bend specimen

✍ Scribed by Robert H. Dodds Jr; William C. Carpenter; William A. Sorem

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 886 KB
• Volume: 29
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(88)90017-3

✦ Synopsis

A J-integral (j) for the pointwise description of the fracture driving force along a 3-D crack front is studied for the three-point bend specimen. Results of a 3-D nonlinear finite element analysis arc used to compute J along the crack front. The analytical values are compared to experimenta_l 'mean' values derived from the recorded load and crack mouth opening displacement. The J-integral is found to be path independent when area integrals are added to the line integrals.

The J-values at the specimen centerplane are slightly larger than the experim_ental 'mean' J-values and decrease rapidly near the free surface. A linear relationship between J and crack tip opening displacement (CTOD) is present at each point along the crack front in this specimen.