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Material Science
Jun 6, 2023
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Addu High School DEPARTEMENT OF SCIENCE Hithadhoo/ Addu LESSON PLAN - 2017 Week : 2 Date : 13.07.2017 Duration :50 min Lesson No : 2 Material Properties Class: 11G Subject: EM Topic: Properties of composites Prior Knowledge (what students already know about the topic): About composites as basic engineering material Objectives of the lesson (what students are going to learn at the end of the lesson, need to be SMART, specific, measurable, achievable, realistic, & time-bound ), & must be identified. At the end of the lesson students will be able to Describe what are the different properties that make composites as engineering material Materials required Chalk and Black board Type of activities students will be engaged in Cooperative learning Peer tutoring Discussion Simulations Group work/pairing Hands-on/ practical Technology integration Project work Role play Others (specify) Introduction Time/min 10 mins We know that the properties of a composite material are determined by three factors: (1) the materials used as component phases in the composite, (2) the geometric shapes of the constituents and resulting structure of the composite system, (3) the manner in which the phases interact with one another. Content Time/min 40 mins The mechanical properties of composite materials usually depend on structure which typically depend on the shape of inhomogenities, the volume fraction occupied by inhomogenities, and the interfaces between the components. The strength of composites depends on such factors as the brittleness or ductility of the inclusions and matrix. For example, failure mechanisms in fiber-filled composites include fracture of the fibers; shear failure of the matrix along the fibers; fracture of the matrix in tension normal to the fibers or failure of the fiber-matrix interface. The mechanism responsible for failure depends on the angle between the fibers and the specimen's axis. If a mechanical property depends on the composite material's orientation, the property is said to be anisotropic. Anisotropic composites provide greater strength and stiffness than do isotropic materials. But the material properties in one direction are gained at the expense of the properties in other directions. For example, silica fibers in a pure aluminum matrix produce a composite with a tensile strength of about 110,000 psi along the fiber direction, but a tensile strength of only about 14,000 psi at right angles to the fiber axis. It therefore Faculty of Science and Technology - Daily Lesson Plan- 2017 1 of 2
only makes sense to use anisotropic materials if the direction that they will be stressed is known in advance. Isotropic material are materials properties independent of orientation. Stiff platelet inclusions are the most effective in creating a stiff composite, followed by fibers, and then by spherical particles. Reflection / Remarks What went well in this lesson? What problem did I experience? Why? What could I have done differently? Feedback by HOD (put a if the following are evident and cross X if not ) Lesson plan submitted on time Lesson plan prepared according to the "SMART" objectives are written in the Lesson plan is detailed for successful Reflection written Checked by Head of the Department Date Time Signature Ms. Fathimath Jadullah Hameed Faculty of Science and Technology - Daily Lesson Plan- 2017 2 of 2
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