RB&W11 recommends turn-of-nut from snug fit to preload as follows: 1/3 turn for bolt grips of 1–4 diameters, 1/2 turn for bolt grips 4–8 diameters, and 2/3 turn for grips of 8–12 diameters. These recommendations are for structural steel fabrication (permanent joints), producing preloads of 100 percent of proof strength and beyond. Machinery fabricators with fatigue loadings and possible joint disassembly have much smaller turns-of-nut. The RB&W recommendation enters the nonlinear plastic deformation zone.
Answer to relevant QuestionsTake Eq. (8–22) and express km /(Ed) as a function of l/d, then compare with Eq. (8–23) for d / l = 0.5.In the figure for Prob. 8–20, the bolts have a diameter of ½ in and the cover plate is steel, with D = ½ in. The cylinder is cast iron, with E = 5/8 in and a modulus of elasticity of 18 Mpsi. The ½ -in SAE washer to be ...If the pressure in Prob. 8–20 is cycling between 0 and 6 MPa, determine the fatigue factor of safety using the: (a) Goodman criterion. (b) Gerber criterion. (c) ASME-elliptic criterion.The figure shows a bolted lap joint that uses SAE grade 8 bolts. The members are made of cold-drawn AISI 1040 steel. Find the safe tensile shear load F that can be applied to this connection if the following factors of ...Find the total shear load on each of the three bolts for the connection shown in the figure and compute the significant bolt shear stress and bearing stress. Find the second moment of area of the 8-mm plate on a section ...
Post your question