Accession Number:

ADA070788

Title:

Fracture Along Planar Slip Bands

Descriptive Note:

Technical rept.

Corporate Author:

MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF METALLURGICAL ENGINEERING

Personal Author(s):

Report Date:

1979-06-01

Pagination or Media Count:

20.0

Abstract:

The conditions for propagation of a crack along an inhomogeneous slip band is considered. Allowing slip to occur in the crack plane but restricting the shear displacement to the crack plane results in a relaxed elastic-plastic state of stress near the crack-tip. Calculations of the resulting crack-tip flow behavior indicate that once a crack with a co-planar shear band has formed, it becomes difficult to activate secondary slip with a shear displacement inclined to the crack plane and inhomogeneous slip prevails. The difficulty of activating non-coplanar secondary slip results in large hydrostatic and normal stress near the crack-tip. The combination of large shear strain due to the inhomogeneous shear band and large normal or hydrostatic stresses present near the crack-tip leads to easy crack propagation along such bands. Fracture along slip bands in Ni-, Al-, and Ti-base alloys is briefly discussed in terms of the model.

Subject Categories:

  • Metallurgy and Metallography
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE