Materials Keywords 0.0 / 5 ? PhysicsMaterialsA2/A-levelOCR Created by: x agrIIta xCreated on: 22-08-17 22:44 Breaking Stress/Tensile Stress Max. stress that can be applied before fracture. 1 of 26 Brittle Material that shows no plastic deformation beyond elastic limit. 2 of 26 Compressive Strain Amount of deformation per unit length of material. 3 of 26 Compressive Stress Compressive force per unit area. 4 of 26 Density Mass per unit volume. 5 of 26 Ductile Material that shows plastic deformation before failure under tension (can also be pulled into wires). 6 of 26 Elastic Limit Point beyond which the material starts to behave plastically. 7 of 26 Hard Materials that resist plastic deformation by surface indentation. 8 of 26 Limit of proportionality Stress is proportional to strain up to this point. 9 of 26 Stiff Measure of resistance of a material to deformation by a tensile force. 10 of 26 Stiffness The gradient of a force-extension graph; also relates to resistance to change of shape of material. 11 of 26 Malleable Materials that show large plastic deformation under compression. 12 of 26 Strength Ability of a material to withstand stress. 13 of 26 Tensile Strain Extension per unit length of material subject to tensile force. 14 of 26 Tensile Stress Tensile force per unit area. 15 of 26 Tough Materials that are able to withstand impact forces without breaking and have a high density. 16 of 26 Yield Point Stress beyond which a material becomes plastically deformed. 17 of 26 Young's Modulus Ratio of stress to strain and also the gradient of stress-strain graph. 18 of 26 Crystal grains Regions of regularity in a lattice. 19 of 26 Grain Boundaries Two regions of grains meeting at angles. 20 of 26 Dislocation Gaps in a material's crystalline structure due to misaligned atoms. 21 of 26 Work hardening Strengthing a metal through plastic deformation which increases the number of grains, making it harder. 22 of 26 Elasticity Measure of ability of a material to restore its shape after deformation. 23 of 26 Polycrystalline A material that has many grains oriented differently to each other but with an ordered structure within each grain (have some regions of regularity). 24 of 26 Crystalline A material that has fixed dislocations. 25 of 26 Amorphous A non-crystalline material which lacks order in layers of particles, caused by rapid cooling. Slower cooling leads to a crystalline structure. 26 of 26
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