Accession Number : ADA161285


Title :   On the Role of Dimensionless Elastic Fracture Mechanics.


Descriptive Note : Final rept. 15 Jan 84-14 Jan 85,


Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Sinclair,G B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a161285.pdf


Report Date : 03 Jul 1985


Pagination or Media Count : 117


Abstract : Dimensionless elastic fracture mechanics - the nondimensionalized counterpart to linear elastic fracture mechanics (LEFM) - predicts size-independent strengths for geometrically similar specimens. This is in contrast to LEFM which has that the stress at fracture reduces as the inverse square root of the in-plane scale factor. It is shown that neither agrees with the data, irrespective of how brittle material response is. Used predictions is possible. However, both are essentially inadequate, since they lack valid underlying physical reasoning and, even as merely empirically based approaches, are short of sufficient accuracy to be reliable in practice. There is a need, therefore, to critically examine the very foundations of elastic fracture mechanics. Keywords: Notched specimens; Stress concentration; Crack propagation. (Author)


Descriptors :   *ELASTIC PROPERTIES , *FRACTURE(MECHANICS) , STRESSES , PREDICTIONS , PHYSICAL PROPERTIES , MATERIALS , REASONING , MECHANICS , CRACK PROPAGATION , BRITTLENESS , RESPONSE , LINEARITY , INVERSION , SQUARE ROOTS , STRESS CONCENTRATION


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE