Accession Number:

ADA312780

Title:

Moire for Dynamic Fracture.

Descriptive Note:

Final rept. 16 Jan 89-31 Jul 96,

Corporate Author:

WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1996-08-20

Pagination or Media Count:

10.0

Abstract:

Geometric Moire and Moire interferometry were used to record the orthogonal displacement fields surrounding stably and rapidly propagating cracks in thin aluminum fracture specimens. The J- and T-integral values were computed directly, for the first time, from the displacement data. J and T were also obtained from staticdynamic, elastic-plastic finite element simulations of the fracture tests. While the ASTM far-field J increased, the near-field J precipitously dropped to zero with crack extension. The popular HRR elastic-plastic crack tip field also collapsed with crack extension. In contrast, the near-field T reached a steady state value with crack extension and was found to be a suitable fracture parameter for characterizing stable and rapid crack growth and arrest.

Subject Categories:

  • Mechanics
  • Inorganic Chemistry
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE