Accession Number:

ADB183967

Title:

Stress-Intensity Factor Equations for Cracks in Three-Dimensional Finite Bodies Subjected to Tension and Bending Loads

Descriptive Note:

Technical memo.

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMIN LANGLEY RESEARCH CENTER HAMPTON VA

Personal Author(s):

• Newman, Jr., J. C.
• Raju, I. S.

Report Date:

1984-04-01

Pagination or Media Count:

41.0

Abstract:

Stress-intensity factor equations are presented for an embedded elliptical crack, a semi-elliptical surface crack, a quarter-elliptical corner crack, a semi-elliptical surface crack along the bore of a circular hole, and a quarter-elliptical corner crack at the edge of a circular hole in finite plates. The plates were subjected to either remote tension or bending loads. The stress- intensity factors used to develop these equations were obtained from previous three-dimensional finite-element analyses of these crack configurations. The equations give stress-intensity factors as a function of parametric angle, crack depth, crack length, plate thickness, and, where applicable, hole radius.

Descriptors:

• *CRACK PROPAGATION
• *BENDING STRESS
• FINITE ELEMENT ANALYSIS
• LOADS(FORCES)
• THREE DIMENSIONAL
• POISSON RATIO
• THICKNESS
• FATIGUE(MECHANICS)
• METAL PLATES
• SURFACE TENSION
• STRESS ANALYSIS
• APPROXIMATION(MATHEMATICS)

Subject Categories:

• Aircraft
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE