Accession Number : ADA188475

Title :   Study of the Effects of Metallurgical Factors on the Growth of Fatigue Microcracks.

Descriptive Note : Final rept. 1 Nov 80-30 Sep 87,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Lankford, James

PDF Url : ADA188475

Report Date : 25 Nov 1987

Pagination or Media Count : 16

Abstract : Crystallographic and microstructural factors involved in the growth of small fatigue cracks have been characterized for Al alloys. Special techniques have been used to study and quantify the behavior of local crack tip yielding and incremental crack advance. Results have been incorporated into a physically-based, deterministic crack growth model which successfully predicts microcrack growth rates. Keywords: Small cracks, Microcracks, Fatigue, Crack tip strain, Crack tip opening, Crack opening load, Crystallographic effects, Crack growth models.

Descriptors :   *MICROCRACKING, *ALUMINUM ALLOYS, CRACK PROPAGATION, CRACKS, CRYSTALS, FATIGUE(MECHANICS), MATHEMATICAL MODELS, MICROSTRUCTURE, RATES, FRACTURE(MECHANICS), CYCLIC TESTS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE