A stepped bar with circular cross-section and supported at top, hangs vertically under its own weight. Dimensions of the bar are as shown in the figure below. Calculate the elongation of the bar under its own weight. What is the change in diameter of the bar at section A-A shown in the figure? T 1000 mm 1000 mm TE 500 mm A 100 mm dia 70 mm dia E = 2 x 105 N/mm², density y = 8 x 10-5 N/mm³ and Poisson's ratio μ = 0.2.

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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.