Methods and systems to predict fatigue life in aluminum...

Details Methods and systems to predict fatigue life in aluminum... Methods and systems to predict fatigue life in aluminum...

2008-05-05

2009-11-24

Le, John H (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C702S185000, C703S002000

Reexamination Certificate

active

07623973

ABSTRACT:
Methods and systems of predicting fatigue life in aluminum castings that combines extreme values of both casting flaws and microstructures with multiscale life models. The multiscale life models account for differing fatigue crack initiation based on the size scale of the defect and microstructure features, including provisions for generally millimeter scale casting flaws, generally micrometer scale second phase particles by cracking or debonding, or submicrometer scale dislocation interactions with precipitates which form persistent slip bands. In the presence of casting flaws, the fatigue initiation life is negligible and the total fatigue life is spent in propagation of a fatigue crack from such flaws. In the absence of casting flaws, however, the total fatigue life is spent in both crack initiation and propagation, except for the case where fatigue cracks initiate from large second phase particles in a coarse microstructure.

REFERENCES:
patent: 6912913 (2005-07-01), Murakami
patent: 7016825 (2006-03-01), Tryon, III
patent: 2008/0015827 (2008-01-01), Tryon et al.
Valerie Chavez-Demoulin et al., Extreme Value Theory Can Save Your Neck, Jan. 8, 2004, pp. 1-5.

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