Measuring and testing – Specimen stress or strain – or testing by stress or strain...
Patent
1994-06-14
1995-05-30
Chilcot, Jr., Richard E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
73810, 73789, G01B 530
Patent
active
054192005
ABSTRACT:
To determine the optimum load a laminate member or element is capable of bearing, a three-dimensional progressive analysis is proposed in which the stress and strain states of each ply of the laminate are subjected to failure criteria. If there is failure, new ply stiffness parameters are calculated. Thereafter, the ply is tested with the new parameter until the optimal load is determined. If no failure is detected for a given stress and strain for the ply then the load may be incremented and again applied to the ply, for further testing. Alternatively, the same load may be applied to the ply for a further period of time, until the optimal load is determined and/or the analysis is deemed to be finished.
REFERENCES:
patent: 4936141 (1990-06-01), Anderson, Jr. et al.
patent: 5201424 (1993-04-01), Hain
Hahn et al., "Constitutive Modeling of Composite Laminates with Progressive ly Cracking", Technical Report BRL-TR-3399, Sep. 1992.
Bogetti Travis A.
Burns Bruce P.
Chilcot Jr. Richard E.
Harris Charles H.
Krosnick Freda L.
Noori Max H.
Roberto Muzio B.
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