Question

9-13

Stresses and Strains 237 Hex bolt head Hex bolt head Bolt shank 6000 t Problem 9-12 9-12. The -in-diameter bolt shown is subjected to a 6000-b 920 A stel rod 10 ft long is made up of two 5 ft lengths, one tensile load. The bolt passes through a -in-thick plate Computein in diameter and the other j in. in diameter. How much will the bar elongate when subjected to an axial tensile load of (a) the tensile stress in the bplt (b) the shear stress in the head of the bolt 5000 1b? 9-21. A titanium alloy bar elongates 0.500 in. when subjected to cross-sectional area of 2:25 in2. Compute the modulus of elastic- Section 9-4 Tensile and Compressive Strain and Deformationaxial tensile load of 100 k. The bar is 16 ft lontg and has 9-13. Why is strain unitless (or dimensionless)? 9-14. ity E. Use a proportional limit of 125 ksi.

Answer 1

Strain have no unit because it is a ratio of two similar quantities Strain = change in length/original length strain = L/L As both the quantities have same dimensions i.e. meter in this case. Therefore is a dimension less quantity and have no unit