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An Experimental Study of a Stitched Composite with a Notch Subjected to Combined Bending and Tension LoadingA series of tests was conducted to measure the strength of stitched carbon/epoxy composites containing through-thickness damage in the form of a crack-like notch. The specimens were subjected to three types of loading: pure bending, pure tension, and combined bending and tension loads. Measurements of applied loads, strains near crack tips, and crack opening displacements (COD) were monitored in all tests. The transverse displacement at the center of the specimen was measured using a Linear Variable Differential Transformer (LVDT). The experimental data showed that the outer surface of the pure tension specimen failed at approximately 6,000 microstrain, while in combined bending and tension loads the measured tensile strains reached 10,000 microstrain.
Document ID
19990064576
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Palmer, Susan O. (NASA Langley Research Center Hampton,VA United States)
Nettles, Alan T. (NASA Langley Research Center Hampton,VA United States)
Poe, C. C., Jr. (NASA Langley Research Center Hampton,VA United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1999
Subject Category
Composite Materials
Report/Patent Number
NASA/TM-1999-209511
NAS 1.15:209511
L-17884
Funding Number(s)
PROJECT: RTOP 538-10-11-05
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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