Accession Number:

ADA317087

Title:

Laser-Induced Controlled Flaw Testing in Ceramics.

Descriptive Note:

Final rept. 1 Apr 91-31 Aug 96,

Corporate Author:

LEHIGH UNIV BETHLEHEM PA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

1996-09-30

Pagination or Media Count:

8.0

Abstract:

The present investigation yields significant results in controlling crack formation in transparent ceramic crystals LiF, MgO, ZrO2, and Al2O3, as well as in amorphous solids fused quartz and PMMA through a series of systematic experimentations and theoretical modeling of the laser-solid interaction. The impact of such success is the extension of another dimension in the investigation of many mechanical and physical problems from the current two-dimensional simplifications to three-dimensional phenomena. The critical control of the formation of internal cracks allowed us, for the first time to examine the interaction of three-dimensional cracks in PMMA and fused quartz, and to validate the general predictions of the available theoretical analyses. We also studied the interaction of a penny-shaped internal crack and dislocations in lithium fluoride single crystals, a phenomenon currently under renewed extensive investigation for fundamental understanding of the ductile vs. brittle behavior of solids.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Inorganic Chemistry
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE