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What are the main materials of the Protective Case? What is the main role?

What are the main materials of the Protective Case? What is the main role?

Protective case material in a certain temperature conditions and external forces, resistance to deformation and fracture capacity known as the mechanical properties of the material. Boiler, pressure vessel materials, the general mechanical properties of the main indicators include: strength, hardness, plasticity and toughness.

(1) strength: strength refers to the metal material in the external force on the deformation or fracture resistance. Strength index is an important basis for the design of the allowable stress, the commonly used strength index has yield strength σS or σ0.2 and tensile strength σb, high temperature work, but also consider the creep limit σn and lasting strength σD.

(2) plasticity: plastic refers to the metal material in the fracture before the plastic deformation of the ability. The plasticity index includes the elongation δ, that is, the relative elongation after the specimen is pulled off; the shrinkage rate ψ of the section, that is, the relative reduction of the cross-sectional area after the specimen is pulled off; The specimen is bent to the angle measured when the first crack occurs on the face.

(3) toughness: toughness refers to the ability of metal materials to resist the impact load. Toughness commonly used impact energy Ak and impact toughness value αk said. The alphak or αk values, in addition to the impact resistance of the material, are also sensitive to some of the defects in the material and can reflect the material changes in material quality, macroscopic defects and microstructures. And Ak is very sensitive to the brittle material conversion, low temperature impact test can test the cold brittle steel. A new indicator of material toughness is the fracture toughness δ, which reflects the resistance of the material to crack propagation.

(4) hardness: hardness is a measure of the degree of soft and hard material performance indicators. Hardness test methods are more, the principle is not the same, measured hardness values and meaning is not exactly the same. (HRA, HRB, HRC), Vickers hardness (HV), the value of which means that the surface of the material is resistant to the penetration of hard objects. The And Shore hardness (HS) is a rebound law hardness test, its value represents the size of metal elastic deformation work. Therefore, the hardness is not a simple physical quantity, but reflects the material elasticity, plasticity, strength and toughness of a comprehensive performance indicators.

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