Study on the Ductile Fracture of a Surface Crack : 2nd Report, The effect of Aspect Ratio

Abstract

The ductile fracture of a surface crack is studied experimentally and numerically using A 533 B steel. At first, a new method by which one can obtain a surface crack with a different aspect ratio with good reproducibility is propose. Then the ductile fracture test is carried out using four kinds of specimens with different aspect ratio. The distributions of SZW. a. and CTOD are neasured along the crack front, and the effect of the spect ratio on their distribution patterns are discussed. Three-dimensional finite element analyses are also carried out and the distributions of J are evaluated. By comparison with the experimental results, the availability of fracture criterion used in two-dimesnional fracture mecahnics is discussed.