Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1997-01-16
1998-04-07
Chilcot, Richard
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73791, G01N 1908, G01N 2904
Patent
active
057366454
ABSTRACT:
A method of predicting crack initiation based fatigue life includes the steps of plotting the elastic finite element stress states of a stress history for a given component at a predetermined critical location in the stress space and determining the least square fit ellipsoid of the stress states by a straight line through the center of gravity. An aspect ratio .lambda..sub.2 /.lambda..sub.1 is defined where .lambda..sub.1 and .lambda..sub.2 are the two largest eigen values of the eigen system of matrix M which defines the least square fit ellipsoid and where .lambda..sub.1 .gtoreq..lambda..sub.2. A multiaxial fatigue analysis is performed where the aspect ratio exceeds a predetermined value.
REFERENCES:
patent: 3887987 (1975-06-01), Salt
patent: 4590804 (1986-05-01), Brull
patent: 4711131 (1987-12-01), Hopkins
patent: 4875170 (1989-10-01), Sakurai et al.
"The Assessment and Use of Linear Static FFE Stress Analyses for Durability Calculations", by Peter Heyes, John Dakin and Christopher St. John, pp. 189-199. (No date).
"Analysis of Stain Gage Rosette Data for Fatigue Life Predictions" by J.W. Fash and F.A. Conle. (No date).
Chin-Chan Chu
Hubner Angela
Chilcot Richard
Ford Global Technologies Inc.
May Roger L.
McKenzie Frank G.
Noori Max H.
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