A high-density polyethylene [E = 128 ksi; a = 88 x 10-6/°F] bar is positioned between two rigid supports, as shown. The bar is square with cross-sectional dimensions of 2.50 in. by 2.50 in. and length L = 48 in. At room temperature, a gap of A = 0.35 in. exists between the block and the rigid support at B. After a temperature increase of 120°F, determine magnitude of the normal stress in the bar. Answer in psi rounded-off to 2 decimal places. L

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.