Graduate Thesis Or Dissertation
 

A comparison of experimental mode I analysis methods for the interlaminar fracture toughness characterization of graphite/epoxy composite materials

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  • Three approaches for evaluating mode I interlaminar strain energy release rates in graphite/epoxy composites were compared using experimental data from double cantilever beam specimens. Expressions for evaluating strain energy release rates were arrived at based on assumptions regarding specimen geometry and material behavior. The calculations included the direct method of the J integral approach, a compliance calibrated approach and an analytical equation derived from small deflection, linear beam bending theory. The J integral approach accounts for both linear and nonlinear material response, whereas the compliance calibrated and linear beam bending methods assume linear material behavior. Experimental observations of several material systems indicated a nonlinear elastic material response. Interlaminar strain energy release rates were found to be overestimated by methods assuming linear material behavior. Permanent deflection was seen to accumulate in the arms of the double cantilever beam specimen as the crack surface area increased. This component of deflection must be accounted for in all forms of analysis when using double cantilever beam specimens.
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