Accession Number : AD0629436

Title :   FRACTURE MECHANICS: A BASIS FOR BRITTLE FRACTURE PREVENTION,

Corporate Author : WESTINGHOUSE ATOMIC POWER DIV PITTSBURGH PA

Personal Author(s) : Johnson,R. E.

Report Date : NOV 1965

Pagination or Media Count : 91

Abstract : The development of fracture mechanics is presented both historically and mathematically. The central problems and limitations of experimental fracture mechanics are detailed along with the assumptions and approximations used. The meaning, measurement, and utility of plane strain fracture toughness (critical strain energy release rate or critical stress intensity factor) are discussed. The role of defects in components is discussed specifically with respect to the relationships between stress fields, defect geometry, and material condition. Basic aspects of ultrasonic testing are discussed with respect to quantitative measurement of defect geometries in structures. Selected experiments dealing with application of fracture mechanics to predict actual component failures are reviewed. It is shown that the relationships between stress state, defect geometry, elastic constants, and fracture toughness employed in applied fracture mechanics can be utilized to predict brittle failure conditions in a more quantitative manner than transition temperature concepts. (Author)

Descriptors :   (*FRACTURE(MECHANICS), BRITTLENESS), TOUGHNESS, TRANSITION TEMPERATURE, MEASUREMENT, STRAIN(MECHANICS), DEFECTS(MATERIALS), FAILURE(MECHANICS), MATHEMATICAL PREDICTION, TEMPERATURE, STRESSES, THEORY

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE