Accession Number:

AD0776977

Title:

Experimental Determination of Side Boundary Effects on Stress Intensity Factors in Surface Flaws.

Descriptive Note:

9Rept. for 1973-1974,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS

Personal Author(s):

• Jolles,M..
• McGowan,J. J.
• Smith,C. W.

Report Date:

1974-03-01

Pagination or Media Count:

27.0

Abstract:

A technique consisting of stress-freezing photoelasticity coupled with a Taylor Series Expansion of the maximum local in-plane shearing stress known as the Taylor Series Correction Method TSCM is applied to the determination of stress intensity factors SIFs in flat bottomed surface flaws of flaw depthlength ratios of approximately 0.033. Flaw depththickness ratios of approximately 0.20 and 0.40 were studied as were plate widthcrack length ratios of approximately 2.33 and 1.25, the former of which corresponded to a nearly infinite width. Agreement to well within 10 was found with the Rice-Levy and Newman theories using a depth-modified secant correction and equivalent flaw depthlength ratios. The Shah-Kobayashi Theory, when compared on the same basis, was lower than the experimental results. On the basis of the experiments alone, it was found that the SIF was intensified by about 10 by decreasing the plate widthcrack length from 2.33 to 1.25. Author-PL

Descriptors:

• *PHOTOELASTICITY
• *SURFACES
• NUMERICAL ANALYSIS
• DEFECTS(MATERIALS)
• STRESSES
• TAYLORS SERIES
• CRACK PROPAGATION
• FRACTURE(MECHANICS)

Subject Categories:

• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE