Accession Number:

ADA220418

Title:

J-Integral and HRR Field of a Stably Growing Crack, an Experimental Analysis

Descriptive Note:

Technical rept.

Corporate Author:

WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING

Report Date:

1990-04-01

Pagination or Media Count:

13.0

Abstract:

The displacement fields surrounding stably growing cracks in 7075-T6, 2024-0, 2024-T3, 5052-H32 and 2091 aluminum alloy, standard and cruciform, single-edge notched SEN specimens were determined by Moire interferometry. An approximate and exact J-integral values were determined and found to be within 5 of each other and were both path independent. The associated HRR crack tip displacements in all specimens were in agreement with the measured displacements vertical to the crack but consistently differed in magnitude and order of singularity with the measured displacements parallel to the crack. One of the most popular ductile fracture criterion of the past two decades is the J-integral concept 1 for which enormous developmental efforts have been expended in recent years. The J-integral is heralded by many as a stable crack growth and ductile fracture criteria since in its linearly elastic limit, it reduces to the elastic strain energy release rate.

Subject Categories:

  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE