Materials Definitions 4.0 / 5 based on 1 rating ? PhysicsMaterialsASOCR Created by: tallfaizanCreated on: 18-02-16 23:32 Tensile Force A force which produces extension 1 of 22 Compressive Force A force which compresses an object 2 of 22 Elastic Deformation The material will return to its original length when the force is removed. 3 of 22 Plastic Deformation Permanent structural changes occur, and the material doesn't return to its original length when the force is removed. 4 of 22 Hooke's Law Within the elastic limit of a material, the extension of the elastic body is proportional to the force producing it. 5 of 22 Force Constant, K A measure of the stiffness of the elastic body 6 of 22 Loading curve A force-extension graph. 7 of 22 Unloading curve Removal of the force 8 of 22 Hysterisis Loop A loop formed from the loading and unloading curves of a force extension graph 9 of 22 Tensile Stress Force applied per unit cross-sectional area 10 of 22 Tensile Strain Fractional change in the original length of the wire 11 of 22 Ductile The material can easily be drawn into wires or hammered into thin sheets 12 of 22 Limit of Proportionality The point on a force-extension graph where the stress is no longer directly proportional to the strain. 13 of 22 Elastic Limit Elastic Deformation occurs up until the elastic limit. 14 of 22 Yield Points Where the material extends rapidly. 15 of 22 Ultimate Tensile Strength The maximum stress a material can withstand when being stretched, before it breaks. 16 of 22 Breaking Point The point at which the material actually breaks. 17 of 22 Breaking Strength The stress value at the breaking point. 18 of 22 Strong Material A strong material is one with a high ultimate tensile strength. 19 of 22 Young's Modulus The ratio of stress to strain. 20 of 22 Brittle A material which shows elastic behaviour up until its breaking point, without plastic deformation. 21 of 22 Polymeric A material which consists of long molecular chains. 22 of 22
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