Accession Number:

ADA142507

Title:

J-R Curve Determination Using Precracked Charpy Specimens and the Load-Drop Method for Crack Growth Measurements.

Descriptive Note:

Final rept.,

Corporate Author:

ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB

Personal Author(s):

Report Date:

1984-04-01

Pagination or Media Count:

29.0

Abstract:

J-R curves for two aluminum alloys, a titanium alloy and a high strength-low alloy steel at two different strength levels were determined using precracked Charpy specimens. Three methods were used to measure crack growth 1 multi-specimen, 2 compliance unloading, and 3 the load-drop method. The load-drop method assumes that crack growth occurs only after peak load has been attained and the amount which the load decreases after peak load is related to the size of the uncracked ligament. Comparisons between the three methods for all of the materials show remarkably similar J-R curves. Also, using these curves to determine a JIc indicates very little difference between the load-drop method and the others in the measurement of toughness.

Subject Categories:

  • Metallurgy and Metallography
  • Mechanics
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE