A member formed by connecting a steel bar to an aluminum bar as shown in Fig. Assuming that the bars are prevented from buckling sideways, calculate the magnitude of force P that will cause the total length of member decrease (0.25 mm). The values of elastic modulus for steel and aluminum are (2.1 x 10 N/mm') and (7 x 10' N/mm') respectively. 5 am x 5 cm Steel bar 30 cm 10 am x 10 cm Aluminium bar 38 cm

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Material Properties

Construction in civil engineering demands high strength, durability, and longevity. These targets can be achieved by better design and analysis, along with the correct choice of materials. Different materials have different properties and hence, they respond and performs differently under the various condition of external loadings. It is therefore a critical task of an engineer to select the right material based on the property that the material is supposed to function in real-time. When speaking about the property, there are different categories of material properties like chemical property, physical property, mechanical property, electrical property, magnetic property, thermal property, etc. These material properties form the basis of material selection in various applications.