G - Physics – 01 – N
Patent
G - Physics
01
N
18/1170, 341/108
G01N 29/00 (2006.01) G01N 33/44 (2006.01)
Patent
CA 1315512
SYSTEM FOR STABILIZING DIMENSIONAL PROPERTIES OF CURED COMPOSITE STRUCTURES ABSTRACT OF THE DISCLOSURE Method and apparatus are disclosed for inducing dimensional stability in cured composite structures using acoustic emission analysis to identify the appropriate level and extent of coincident thermal conditioning. Temperature of the composite structure is lowered at a bounded rate to a minimum temperature typical of the intended operating environment. Passive stress wave acoustic emissions of the composite are analyzed to generate a signature of stress relaxation events over time. When the rate of stress relaxation events decreases below a predetermined percentage of the maximum rate, and remains below that level for a period of time sufficient to predict operational stability, thermal conditioning is terminated. 9443-11/860120/9443
588348
Fetherstonhaugh & Co.
Space Systems/loral Inc.
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