Accession Number : ADA306196

Title :   Influence of Three Dimensional Effects on the Stress Intensity Factor for Compact Tension Specimens.

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING

Personal Author(s) : Schroedl, M. A. ; Smith, C. W.

PDF Url : ADA306196

Report Date : JUL 1973

Pagination or Media Count : 32

Abstract : The stress freezing technique of photoelasticity was utilized to study the stress intensity variation between full thickness and center slices of compact tension specimens for various crack lengths. Specimen geometries covered an a/w range of 0.3 to 0.7 and for values of w/B of 2 and 3.5 Normalized SIF results for geometries within ASTM E 399-72 specifications (i.e. w/B = 2.0, a/w = 0.50) agreed with the ASTM solution to within experimental error. However, for a/w values outside the ASTM range (0.45 to 0.55), experimental results were measurably higher than the ASTM results for w/B = 2.0 and averaged 13% higher for all a/w studied at w/B 3.5. The center slice SIF was found to be 5 to 10% higher than the through the thickness average on all tests. (AN)

Descriptors :   *PHOTOELASTICITY, *STRESS CONCENTRATION, STRESS STRAIN RELATIONS, THICKNESS, STRESS ANALYSIS, STRESS TESTING, CRACKING(FRACTURING), INTENSITY, THREE DIMENSIONAL, CRACK PROPAGATION, FREEZING, ERROR ANALYSIS, SHEAR STRESSES, LEAST SQUARES METHOD, TENSION.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE