Accession Number:

ADA326227

Title:

X-Ray Diffraction and Finite Element Study of Residual Stress Effects on Fatigue Crack Growth.

Descriptive Note:

Technical rept. no. 34,

Corporate Author:

NORTHWESTERN UNIV EVANSTON IL

Personal Author(s):

• Almer, J. D.
• Cohen, J. B.
• McCallum, K. R.
• Winholtz, R. A.

Report Date:

1997-05-01

Pagination or Media Count:

8.0

Abstract:

The combined techniques of microbeam x-ray diffraction and Finite Element FE analysis have been used to analyze the residual stresses resulting from an interference operation in 1080 steel. Both techniques showed the resulting stresses to be tensile, and accelerated growth rates were observed in fatigue cracks subsequently grown into this residual stress field. The growth rates also showed a clear sensitivity to applied stress intensity level. Through thickness residual stress variations as predicted by FE analysis help explain observed crack front shapes.

Descriptors:

• *FINITE ELEMENT ANALYSIS
• *CRACKING(FRACTURING)
• *X RAY DIFFRACTION
• *STEEL
• *RESIDUAL STRESS
• THICKNESS
• STRESS ANALYSIS
• SHAPE
• CRACK PROPAGATION
• FATIGUE TESTS(MECHANICS)
• MICROBEAMS

Subject Categories:

• Properties of Metals and Alloys
• Numerical Mathematics
• Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE