On the use of crack-tip-opening displacement to predict the fracture strength of notched graphite/epoxy laminates |
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Authors: | C E Harris D H Morris |
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Institution: | (1) Aerospace Engineering Department, Texas A&M University, 77843 College Station, TX;(2) Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, 24061 Blacksburg, VA |
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Abstract: | The fracture strength and crack-opening displacement of notched graphite/epoxy laminates were measured experimentally using the center-cracked tension-specimen geometry. Four replicate tests were conducted for a variety of laminate stacking sequences, thicknesses, and notch lengths. Most laminates exhibited extensive notch-tip damage prior to fracture. Values of crack-tip-opening displacement (CTOD) at fracture were estimated from values of crack-opening displacement measured at the crack center line. CTOD was independent of specimen crack length for the 0/±45/90]
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laminates. In addition, notched laminate strength was accurately predicted using a Dugdale-type model along with the estimated CTOD.Paper was presented at V International Congress on Experimental Mechanics held in Montreal, Quebec, Canada on June 10–15, 1984. |
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