Accession Number : AD0768926

Title :   The Critical Crack-Tip Opening Displacement and Microscopic and Macroscopic Fracture Criteria for Metals.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Robinson,John N. ; Tetelman,Alan S.

Report Date : AUG 1973

Pagination or Media Count : 232

Abstract : The critical plane strain stress intensity factor (KIc), when combined with nondestructive testing, can be related to the fracture stress of a structure and has gained acceptance for the design of certain critical systems. Presently accepted methods of measuring KIc are, however, difficult and expensive to use for all but low toughness, high strength materials. The major objective of this investigation has been the development of a fracture criterion which can be related to the load-bearing capability of a structure yet is easily measurable using small inexpensive specimens, even for tough, low-strength materials. Because of its potential as a fracture criterion for fracture beyond general yield, particular emphasis has been placed on the measurement of on-load crack tip opening displacement, COD. Special significance has been placed on measuring critical values of plane strain COD at fracture initiation, (COD)Ic. (Modified author abstract)

Descriptors :   (*FRACTURE(MECHANICS), *METALS), TEST EQUIPMENT, CRACK PROPAGATION, STRAIN(MECHANICS), STEEL, ALUMINUM ALLOYS, TITANIUM ALLOYS, TOUGHNESS, SILICONES, MEASUREMENT, STRESSES, BENDING

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE