Dynamic analysis for two-dimensional multiple crack division

✍ Scribed by G.C. Sih; G.R. Irwin

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 756 KB
• Volume: 1
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(70)90002-0

✦ Synopsis

Based on the concept of linear-elastic fracture me&an& two dynamic adjustments are made upon the static form of the crack-extension force IQ for the problem of evenly spaced radial cracks spreading out from a point and terminating on a circular locus. The first adjustment is concerned with the magnitude of the local dynamic stress tending to open the crack. This dynamic stress can be approximated by the eircumferential stress near a circular locus of stress relief expanding at a constant speed provided that the arc length between adjacent crack ends is sufficiently small in comparison with the circle radius. The second adjustment is concerned with the influence of crack speed on the crack-opening displacement and on the rate of release of stress field energy, 3. This c;m be determined by application of the crack closure method for a traveling crack. These two dynamic adjustments are found to be opposite in direction, The degree of compensation depends on the speed of crack propagation and the Poisson's ratio of the material