Situation 2 For the assembly shown, determine the stress in each of the two vertical rods if the temperature rises 40°C after the load P-50 KN is applied. Neglect the deformation and the mass of the horizontal bar AB. Compute the vertical movement under the load. Steel Aluminum E-200 GPa La4m E=70 GPa L-3m A=300 mm a-11.7x10*/C A-900 mm a-23x10* /C 3 m 3 m 3 m Situation 3

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Properties of materials

A property of a material describes its characteristics and distinguishes it from the others. The material properties are described it in terms of its hardness, color, appearances, and so on. The material properties generally depend on the type of material, or whether it is a metal or an alloy. There are different kinds of material properties such as mechanical properties, thermal properties, physical properties, and chemical properties. Chemical properties describe the material in terms of a chemical change. The mechanical properties come into existence when the material is acted upon by an external load. Thermal properties are associated with the temperature of the material and specific heat.