Accession Number : AD0482903

Title :   DYNAMIC CRITERIA FOR CRACK NUCLEATION AND GROWTH.

Corporate Author : ILLINOIS UNIV AT URBANA

Personal Author(s) : Gilman, J. J.

Report Date : 1966

Pagination or Media Count : 21

Abstract : Because of the observed rate dependence of fracture in an elastic-plastic medium, it is clear that a static criterion for fracture in such a medium is insufficient, and even a quasidynamic criterion is somewhat too indefinite to be satisfying. Also, the geometry of a crack is sufficiently complex to ensure that any accurate model will necessarily require numerical computations. Therefore, a simplified but analytic model will have value because it can give quick insight to the physical situation; and how it can be modified. Thus, the purpose of this discussion is to develop a simple, and therefore approximate, model of the conditions that must be met before a crack can grow in size in an elastic-plastic medium.

Descriptors :   (*FRACTURE(MECHANICS), MATHEMATICAL MODELS), (*APPROXIMATION(MATHEMATICS), NUCLEATION), PROPAGATION, DEGRADATION, STRESSES, TENSILE PROPERTIES, ELASTIC PROPERTIES, PLASTIC PROPERTIES, BRITTLENESS, VELOCITY, STRAIN(MECHANICS), LOADS(FORCES), GRAIN BOUNDARIES, MATERIALS, GRAIN SIZE.

Subject Categories : Electric Power Production and Distribution
      Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE