Influence of singularity dominated zone for propagating cracks in finite size specimens
Date of Original Version
The singularity dominated zones for straight as well as curved cracks propagating in finite size specimens were determined experimentally by using the optical method of dynamic photoelasticity using the near-field stress equations. Experimental data was carefully analyzed using improved numerical schemes to get the complete stress field around the propagating crack. This stress field was critically examined to evaluate the size of singularity dominated zones for cracks propagating in straight as well as curved paths. For this purpose, the exact solution was compared with the singular solution using stress components σx, σy, τxy and the maximum shear stress τmax as a criterion respectively. For straight cracks where the stress field is symmetric about the crack path, the singularity dominated zones can be determined by using any one of the stresses. However, for a curved crack, the zones were unsymmetric. This study shows that σy, the crack opening stress, yields the best result for characterizing the singularity dominated zone around a running crack tip. © 1991.
Theoretical and Applied Fracture Mechanics
Zhu, C. Y., R. Chona, and A. Shukla. "Influence of singularity dominated zone for propagating cracks in finite size specimens." Theoretical and Applied Fracture Mechanics 16, 2 (1991): 167-177. doi:10.1016/0167-8442(91)90034-H.