Elasticity of Materials It is the property of a material by which it regains

Elasticity of materials it is the property of a

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Elasticity of Materials It is the property of a material by which it regains its original dimensions on removal of load or force. Plasticity of Materials When we keep on increasing the load beyond limit of elasticity material retains its moulded state. This property of material is called plasticity. Porosity of Materials When a material is in melting condition, it contains some dissolved gases within the material. When the material solidifies, these gases get evaporated and leave behind voids. The porosity of material represents the quantity of voids in solid materials.
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~ Page 28 of 79 ~ Thermal Conductivity of Materials It is the property of a material which represents how easily the heat can be conducted by the material. The thermal conductivity of a material can be defined as “the amount of heat transmitted by unit thickness of material normal to the unit area surface in unit time when the temperature gradient across the material piece is unity in steady state condition. Its unit in SI system is watts per meter per °K. Electrical Conductivity of Materials It is the property of material which represents how easily electricity can be conducted by the material. It is denoted by ‘σ’. It is the reciprocal of resistivity of material. Its unit is mho/meter. Chemical Properties of Materials As an Engineer it is important to have knowledge of chemical properties of engineering materials. This is because most of the engineering materials come into contact with other materials and they react chemically with each other. Due to this chemical reaction they may suffer from chemical deterioration. Some of the chemical properties of engineering materials are listed below. Chemical Composition The chemical composition of engineering material indicates the elements which are combined together to form that material. Chemical composition of material affects the properties of engineering materials very much. The strength, hardness, ductility, brittleness, corrosion resistance, weldability, etc. depend on chemical composition of materials. Hence, we should also have the knowledge of chemical composition of engineering materials. Chemical compositions of some materials are listed below. S/No. Material Chemical Composition 1. Steel Fe, C, Cr, Ni 2. Brass Cu, Zn 3. Bronze Cu, Sn 4. Invar Fe = 64%, Ni = 36% 5. Gunmetal Cu = 88%, Tin = 10%, Zn = 2% 6. German silver or Nickel silver or Electrum Cu = 50%, Zn = 30%, Ni = 20% 7. Nichrome Ni = 60%, Cr = 15%, Fe = 25% 8. Phosphor bronze Cu = 89 95.50% , Tin = 3.50 -10%, P = 1% 9. Manganin Cu = 84%, Mn = 12%, Ni = 4% 10. Constantan Cu = 60%, Ni = 40%
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~ Page 29 of 79 ~ Atomic Bonding Atomic bonding represents how atoms are bounded to each other to form the material. Many properties, such as melting point, boiling point, thermal conductivity & electrical conductivity of materials are governed by atomic bonding of materials.
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