How can some high strength polymers such as Kevlar polymer have higher strength than some metals?
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- Material A is known as a high strength material and Material B has high toughness. Explain the difference between properties of Materials A and B.The modulus of elasticity are slightly higher for ceramic materials, Polymers have modulus values that are smaller than both metals and ceramics.Explain how dislocations have paradoxically rationalized why metals can be bothmechanically weak and strong. How have dislocations helped to explain work hardening of metals.
- Explain in detail the effect of Temperature on the Elastic Modulus and Yield Strength ofEngineering materials.If it is constrained between two supports A and B and is stress-free at 20 ℃, what would be the stress in the two materials when it is heated to 70 ℃, For Steel: Es = 210 GPa, Coefficient of expansion = 12x10^6/℃. For Brass: Eb = 105 GPa, Coefficient of expansion = 19x10^-6/℃Compare ceramics to metals and polymers respectively in terms of deformation
- With the help of a diagram, contrast the stress-strain relationship with respect to ceramic and metalsWith the help of a diagram, contrast the stress-strain relationship with respect to ceramic and metalsA specimen of alloy having the following engineering stresses produces the corresponding plastic engineering strains, prior to necking: Engineering Stress (MPa) Engineering Strain 353.7 0.0357 371.3 0.0436This is a mechanical property of engineering materials that exhibits a slow deformation under long term sustained loads.