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Onset of Resin Micro-cracks in Unidirectional Glass Fiber Laminates with Integrated SHM Sensors: Numerical AnalysisDepartment of Mechanical and Aerospace Engineering, Center of Excellence for Advanced Materials, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0416, USA
Department of Mechanical and Aerospace Engineering, Center of Excellence for Advanced Materials, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0416, USA
Department of Mechanical and Aerospace Engineering, Center of Excellence for Advanced Materials, University of California, San Diego, 9500 Gilman Drive La Jolla, CA 92093-0416, USA, sia{at}ucsd.edu The embedment of micro-sensors and micro-devices into composite laminates for structural health monitoring systems leads to stress/strain concentrations due to geometrical and material discontinuities around such embedded inclusions, with high potential to initiate premature failures. This article presents the efforts to estimate the effects of these stress/strain concentrations induced by the integration of rectangular-shape sensors within unidirectional fiber-glass composites. The micro-crack initiation sites and the failure load are predicted using finite-element simulations. Good agreement has been found between the numerical results and the experimental findings presented in an accompanying paper.
Key Words: structural health monitoring • embedded sensor • stress/strain concentration • finite- element analysis • matrix micro-cracking • composites
This version was published on November
1, 2009 Structural Health Monitoring, Vol. 8, No. 6,
493-507 (2009) |
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