Accession Number : ADA264221


Title :   Two-Parameter Crack Tip Field Associated With Stable Crack Growth in a Thin Plate-A Hybrid Analysis


Descriptive Note : Technical rept. Jun 92-Apr 93,


Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : May, G B ; Wang, F X ; Kobayashi, A S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264221.pdf


Report Date : Apr 1993


Pagination or Media Count : 20


Abstract : Moire interferometry was used to determine the two orthogonal displacement fields surrounding a stably growing crack in a thin 2024-T3 aluminum alloy, single-edge notched (SEN) specimen. The measured displacements were used to compute the J-integral and the associated HRR and the second order Q displacement fields. Also a 2-D elastic-plastic finite element model of the fracturing specimen was executed in its generation mode to compute the crack tip displacement field and the J-integral for small crack extension. The numerically computed and experimentally derived J-values agreed prior to crack extension but differed increasingly with stable crack growth. The HRR and measured v- displacements agreed well but significant difference between the HRR and measured u displacements was noted. Thus the Q component of the v-displacement was negligible but the corresponding u-component varied nonlinearly with radial distance from the crack tip. Ductile fracture, Moire interferometry, Stable crack growth, J-integral, HRR Field.


Descriptors :   *ALUMINUM ALLOYS , *CRACK PROPAGATION , MODELS , CRACKING(FRACTURING) , CRACKS , ALUMINUM , ELASTOPLASTICITY , J INTEGRALS , DUCTILITY , DISPLACEMENT , STRAIN(MECHANICS) , FRACTURE(MECHANICS) , INTERFEROMETRY


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE