An aluminum bar of solid circular cross section is twisted by torques T acting at the ends (see figure). The dimensions and shear modulus of elasticity are as follows: L = 1.4 m, d = 30 mm, and G = 29 GPa. T T L (a) Determine the torsional stiffness of the bar. (Round your answer to the nearest whole number.) kT =| N.m (b) If the angle of twist of the bar is 4° what is the maximum shear stress? (Round your answer to two decimal places.) Tmax MPa (C) What is the maximum shear strain (in radians)? (Round your answer to the nearest whole number). Ymax |x10-6 rad

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Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.