NSU Research Contributions

Title : Inverse Analysis to Determine Crack Bridging Stresses in Fiber Composites

Authors : Mohammad Nazmul Islam, Matsumoto Takashi

Abstract : This paper develops a method to determine “bridging law” for continuously aligned fiber composites to understand damage mechanisms from a maintenance engineering point of view. Fracture mechanics approach has been employed to form the integral equation for mathematical simulation of embedded straight cracks and single edge cracks in specimens of infinite or finite width under tensile and bending stresses. Closing pressure was assumed between the crack surfaces due to continuous fibers or aggregates which remain connected to both the crack surfaces. Inverse analysis is performed on crack opening displacement (COD) data to get magnitude and distribution of bridging stresses for fiber composites. Synthetic data were created by forward analysis for certain crack configurations to get exact COD data from a theoretical point of view. To simulate practical situations, data were made noisy by inserting noise of known levels. Exact bridging stress distributions were retrieved by the inverse analysis up to certain level of noisy data which establishes applicability of the method developed here.

Journal : Journal of applied mechanics	Volume : 6	Year : 2006	Issue :
Pages : 1097-1104	City :	Edition :	Editors :
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