5 mm diameter is used to make a helical compression spring shown in Figure 3. The spring index would be, C = 12. The spring will be operated inside a bore, therefore buckling is insignificant. Both

42. The static deflection at the center of the steel shaft in Fig. 3-53 is equal to 0.35 mm. Find the value of the critical speed. Shaft is steel. Ans. n = 1810 rpm. Design of Shafts Chap. 3 248 t. 50 30 1"dia 10" 10" Figure 3-52 Problem 41. 10 kg 10 kg C B 375 600 mm 375 Figure 3-53 Problem 42.

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A helical compression spring has (8 total coils) is inserted in a hole of diameter (76.5 mm).The spring is made of (12.5 mm) diameter hard drawn steel wire. The spring supports an axial load of (5 kN). Determine maximum stress and total deflection in the spring. Use closed and ground ends.

A helical compression spring is made with oil-tempered wire of diameter 0.2", mean coil diameter of 2", 12 total coils, 5" free length, and squared ends. (a) Find the solid length. (b) Find the force required to compress the spring to closure? (c) Find the factor of safety against yield when compressed to the solid length. (Hint: Uses Say= 0.5 Sut for shear strength.)

Question 6 A B 112 mm 1.2 m 0.9 m Figure 6 The structure supports force P=75 kN, as shown in Figure 6. The solid circular rod BD is made of A992 steel: a. Find the vertical and horizontal component acting on the pin of the pulley C. b. Find the compressive force in the rod BD. c. Find the effective length-factor for BD. d. Express the radius of gyration about any centroidal axis for a solid circular area as a function of the diameter of a circle. e. Find the critical effective slender ratio (KL/r), according to the AISC specifications. f. Determine the required minimum diameter of the A992 steel solid circular rod BD to the nearest mm as allowed by the AISC specifications. g. Determine the F.S. for buckling of the designed rod DB. -0.9 m P