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Fatigue failure load indicatorAn indicator for recording the load at which a fatigue specimen breaks during the last cycle of a fatigue test is described. A load cell is attached to the specimen which is alternately subjected to tension and compression loads. The output of the load cell which is proportional to the load on the specimen is applied to the input of a peak detector. Each time the specimen is subjected to a compression load, means are provided for applying a positive voltage to the rest of the peak detector to reset it. During the last cycle of the tension load the peak detector measures the maximum load on the specimen. Means are provided for disconnecting the load cell from the peak detector when there is a failure in the specimen.
Document ID
19790014366
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Imig, L. A. (NASA Langley Research Center Hampton, VA, United States)
Davis, W. T. (NASA Langley Research Center Hampton, VA, United States)
Davis, D. C. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
March 27, 1979
Subject Category
Structural Mechanics
Accession Number
79N22537
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,145,933|NASA-CASE-LAR-12027-1
Patent Application
US-PATENT-APPL-SN-889670

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