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الجامعة المستنصرية كلية الهندسة قسم الهندسة الميكانيكية مواد هندسية مرحلة 3. COMPOSITE MATERIALS د. ناظم مجبل فالح مواد هندسية 1-1. -Composite materials are engineered materials made from two or more constituent materials that remain separate and distinct while forming a single component

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## COMPOSITE MATERIALS د. ناظم مجبل فالح مواد هندسية 1-1

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**الجامعة المستنصرية**كلية الهندسة قسم الهندسة الميكانيكية مواد هندسية مرحلة 3 COMPOSITE MATERIALSد. ناظم مجبل فالحمواد هندسية 1-1**MECH 473 ~ LECTURE 15: COMPOSITES**-Composite materials are engineered materials made from two or more constituent materials that remain separate and distinct while forming a single component -Generally, one material forms a continuous matrix while the other provides the reinforcement - The two materials must be chemically inert with respect to each other so no interaction occurs upon heating until one of the components melts, an exception to this condition is a small degree of interdiffusion at the reinforcement-matrix interface to increase bonding COMPOSITES**MECH 473 ~ LECTURE 15: COMPOSITES**Composites can be found in: -Boat hulls -The aerospace industry (structural components as well as engines and motors) -Automotive parts (panels, frames, dashboards, body repairs) -Sinks, bathtubs, hot tubs, swimming pools -Cement buildings, bridges -Surfboards, snowboards, skis -Golf clubs, fishing poles, hockey sticks -Trees are technically composite materials, plywood -Electrical boxes, circuit boards, contacts -Everywhere COMPOSITES**MECH 473 ~ LECTURE 15: COMPOSITES**Composites can be classified by their matrix material which include: -Metal matrix composites (MMC’s) -Ceramic matrix composites (CMC’s) -Polymer matrix composites (PMC’s) or sometimes referred to as organic matrix composites (OMC’s) COMPOSITES**MECH 473 ~ LECTURE 15: COMPOSITES**MMC - Metal Matrix Composites -The matrix is relatively soft and flexible. -The reinforcement must have high strength and stiffness -Since the load must be transferred from the matrix to the reinforcement, the reinforcement-matrix bond must be strong. MMC use: -Two types of particulates ( dispersion strengthened alloys and regular particulate composites) -Or long fiber reinforcements COMPOSITES**MECH 473 ~ LECTURE 15: COMPOSITES**PMC - Polymer Matrix Composites -The matrix is relatively soft and flexible -The reinforcement must have high strength and stiffness -Since the load must be transferred from matrix to reinforcement, the reinforcement-matrix bond must be strong CMC – Ceramic Matrix Composites -The matrix is relatively hard and brittle -The reinforcement must have high tensile strength to arrest crack growth -The reinforcement must be free to pull out as a crack extends, so the reinforcement-matrix bond must be relatively weak COMPOSITES

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