Crack tip deformation in LiF for Mode I and II cracks on (100) and (110) planes. Appendix A

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6224204

Chia, K Y; Burns, S J

In this report, the (100) cleavage plane crack-tip dislocations are reviewed and (110) indentation crack tip dislocations are studied in depth. After (110) indentation cracks were formed in the cube surface, the specimen was subject to either additional indentation loads so that the specimen fractured, or tensile tests to study the mode II crack behavior of the (110) cracks. The specimen invariably broke along one of its (100) cleavage planes, yet never along its original (110) cracked surface. Crack tip dislocations play an important role in shielding the (110) crack tips from subsequent propagation. Unloading effects on crack tip deformations for both (100) plane cleavage cracks and (110) plane indentation cracks have been investigated. Results show that unloading contributes to crack closure deformation in the crack tip region.

• Research Organization: Rochester Univ., NY (USA). Dept. of Mechanical Engineering
• DOE Contract Number: FG02-84ER45051
• OSTI ID: 6224204
• Report Number(s): DOE/ER/45051-T1; ON: DE85003912
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
CRACK PROPAGATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
DISLOCATIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HARDNESS
LINE DEFECTS
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
MECHANICAL PROPERTIES
MICROHARDNESS
MONOCRYSTALS
RESEARCH PROGRAMS
VICKERS HARDNESS