A CONSTANT DELTA G TEST FOR MEASURING MODE I INTERLAMINAR FATIGUE CRACK GROWTH RATES (paper presented at the Eighth ASTM Symposium on Composite Materials: Testing and Design, Charleston, SC, 29 Apr - 1 May 86)

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Authors
  1. Russell, A.J.
  2. Street, K.N.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
A method for measuring Mode I interlaminar fatigue crack growth rates under constant strain energy release rate conditions is described and results are presented for two graphite fiber composite materials. The test consists of a uniform width and thickness DCB specimen which is loaded in series with a linear elastic spring in order to provide optimum control of delta G. Tests are run under displacement control and delamination extension is determined by monitoring changes in compliance. A non-linear elastic relationship between load and displacement was required due to a non-linear material response caused by fiber bridging. Fatigue crack growth rates were observed to decline by as much as a factor of ten over a distance of less than 5 mm although this varied depending on material, lay-up and temperature.
Date of publication
01 Jan 1986
Number of Pages
36
DSTKIM No
86-02382
CANDIS No
97095
Format(s):
Document Image stored on Optical Disk;Originator's fiche received by DSIS

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