Ch17a - University of Delaware Center for Composite...

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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu INTRODUCTION TO COMPOSITES Dr. Shridhar Yarlagadda University of Delaware Center for Composite Materials 00000
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu OVERVIEW Definition/History Composite Materials Fibers, Polymers, Fillers etc Comparison to conventional materials, costs etc Thermoplastic vs Thermoset Commonly used thermoplastics Properties of Composite Materials Introduction to micromechanics Ply mechanics and Laminate Theory Factors affecting properties Wrap-up
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu WHAT ARE COMPOSITE MATERIALS? Composites are made from two or more distinct materials that when combined are better (stronger, tougher, and/or more durable) than each would be separately. No mention of length scale! Traditional definition – microscopic scale Not so clear anymore – nanocomposites, molecular level Different from alloys Distinguishable components – what scale?
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu WHY USE COMPOSITES ? Composites have higher strength than traditional materials…. due to aligned fibers carrying the load
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu WHY USE COMPOSITES ? Composites are stiffer than conventional materials of the same weight due to their adaptive nature one can align fibers in the direction to carry the load
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu WHY USE COMPOSITES ? Composites are lighter than traditional materials due to their tailorability they can be designed to minimize weight without sacrificing strength
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu WHY USE COMPOSITES ? Net Shape Manufacturing - less number of moving parts- hence savings in assembly cost
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu HISTORY OF COMPOSITE MATERIALS Composite Materials Man-made Natural Man-made Composite Materials Began with mud/straw for bricks/huts Concrete, plywood, chipboard Advanced Composite Materials Composites in Nature Main structural elements of nature! Tree trunks, Spider webs etc.
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu ADVANCED COMPOSITE MATERIALS Man-made ‘take’ on Nature’s style Consists of high-performance reinforcement in a matrix Reinforcement Particles, Whiskers, Continuous fibers etc Multiple length scales (macro – micro – nano) Matrix Polymer, Ceramic or Metal Application dependent Typically optimized, highly-loaded systems for performance Focus on Polymer Composites
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Center for Composite Materials University of Delaware yarlagad@ccm.udel.edu COMPOSITE HYBRID STRUCTURES Next-generation structures
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Ch17a - University of Delaware Center for Composite...

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