Accession Number : ADA182573

Title :   On the Application of the Strain Energy Density Theory in Predicting Crack Initiation and Angle of Growth,

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Wong,A K

PDF Url : ADA182573

Report Date : Sep 1986

Pagination or Media Count : 26

Abstract : Until recently, the one-parameter singular expression for stresses near a crack-tip was widely thought to be sufficiently accurate over a reasonable region for any geometry and loading conditions. This view has been fast changing due to the growing evidence that the inclusion of higher order terms can significantly affect the solution, particularly under certain biaxial loading conditions. In this context, the present paper examines the strain energy density criterion for fracture, and the consequences of the assumption of a 1/r energy singularity in the formulation on its application. It is found that this assumption imposes a rather severe restriction on the region for which the criterion is applicable, and that its application on an arbitrarily selected 'small' distance from the crack-tip (a procedure which has been adopted by many experimentalists and finite element analysts), can lead to erroneous results.

Descriptors :   *CRACKING(FRACTURING), *FAILURE(MECHANICS), ANGLES, GROWTH(GENERAL), FINITE ELEMENT ANALYSIS, RANGE(DISTANCE), BIAXIAL STRESSES, ENERGY, HIGH RATE, INTENSITY, FRACTOGRAPHY, MODULUS OF ELASTICITY, CRACK PROPAGATION, SHEAR STRESSES, RADIAL STRESS, EIGENVECTORS, MATHEMATICAL PREDICTION, SOLID BODIES, BRITTLENESS, STEEL, STRAIN(MECHANICS), AUSTRALIA

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE