Q6 A screw clamp as shown in the figure, exerted load (30KN), and the type of thread is (Tr.70×8.5). Design stress for the nut is 60MPa and the length of the nut is 40mm. Requirements: 1) Determine the crushing stress and shearing stress for the screw. 2) Calculate the dimensions of the nut.
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- An inflatable structure used by a traveling circus has the shape of a half-circular cylinder with closed ends (see figure). The fabric and plastic structure is inflated by a small blower and has a radius of 40 ft when fully inflated. A longitudinal scam runs the entire length of the "ridge" of the structure. If the longitudinal scam along the ridge tears open when it is subjected to a tensile load of 540 pounds per inch of seam, what is the factor of safety n against tearing when the internal pressure is 0,5 psi and the structure is fully inflated?Solve the preceding problem if the diameter is 480 mm, the pressure is 20 MPa, the yield stress in tension is 975 MPa, the yield stress in shear is 460 MPa, the factor of safety is 2,75, the modulus of elasticity is 210 GPa, Poissorfs ratio is 0.28, and the normal strain must not exceed 1190 x 10" . For part (b), assume that the tank thickness is 8 mm and the measured normal strain is 990 x 10~ .Compare the angle of twist 1 for a thin-walled circular tube (see figure) calculated from the approximate theory for thin-walled bars with the angle of twist 2 calculated from the exact theory of torsion for circular bars, Express the ratio 12terms of the non-dimensional ratio ß = r/t. Calculate the ratio of angles of twist for ß = 5, 10, and 20. What conclusion about the accuracy of the approximate theory do you draw from these results?
- A steel punch consists of two shafts: upper shaft and lower shaft. Assume that the upper shaft has a diameter d1= 24 mm and the bottom shaft has a diameter d2= 16 mm. The punch is used to insert a hole in a 4 mm plate, as shown in the figure. If a force P - 70 kN is required to create the hole, what is the average shear stress in the plate and the average compressive stress in the upper and lower shaft of the punch?When drilling a hole in a table leg, a furniture maker uses a hand-operated drill (see figure) with a bit of diameter d = 4.0 mm. If the resisting torque supplied by the table leg is equal to 0.3 N · m, what is the maximum shear stress in the drill bit? If the allowable shear stress in the drill bit is 32 MPa, what is the maximum resisting torque before the drill binds up? If the shear modulus of elasticity of the steel is G = 75 GPa, what is the rate of twist of the drill bit (degrees per meter)?Solve the following problems as stated below. Draw the figure and FBD. PROBLEM A flanged bolt coupling consist of 9 steel bolts evenly spaced around a bolt circle 300 mm. in diameter and 6 bronze bolts on a concentric bplt circle 200 mm. in diameter. What are the sizes of bolts diameters for steel and bronze, if the torque applied is 6,000 N-m and without exceeding the stress of 60 MPa in the steel and 40 MPa for the bronze? The ratio of the bolt diameter dp / ds = 0.50. For steel, use Gs = 83 GPa and for bronze, Gp = 28 Gpa. R Rs Rb
- Solve the following problems as stated below. Draw the figure and FBD. PROBLEM A flanged bolt coupling consist of 9 steel bolts evenly spaced around a bolt circle 300 mm. in diameter and 6 bronze bolts on a concentric bplt circle 200 mm. in diameter. What are the sizes of bolts diameters for steel and bronze, if the torque applied is 6,000 N-m and without exceeding the stress of 60 MPa in the steel and 40 MPa for the bronze? The ratio of the bolt diameter d, / ds = 0.50. For steel, use Gs = 83 GPa and for bronze, G, = 28 Gpa. %3D Rs RpA 16 in. diameter motor pulley is running at 600 rpm with a 6 in diameter shaft transmitting power to an agricultural locomotive. If the dimensions of the square key is 0.5 x 3 in, what is the maximum force in the pulley’s belt that can be transmitted if the shear stress is limited to 8500 psi and bearing stress limited to 4000 psi?2. A screw clamp shown in the figure has a horizontal handle with diameter 3/8-in made of cold-drawn AISI 1006 steel. The overall length of the handle is 4.25 in. The screw is single-threaded, 3/4 in-10 UNC, and is 8 in long, overall. a. What screw torque will cause the horizontal handle to bend permanently? b. What clamping force will the answer to part a) cause if the collar friction is neglected and if the thread friction is 0.15? Hint: 1) Assume a force Fis applied at the end of the handle. Think about how this force affects the screw vs. how it affects the handle. 2) Consider in which direction the screw is "raised". - 4.25 in
- A screw clamp similar to the one shown in the figure has a handle with diameter in made of cold-drawn AISI 1006 steel. The overall length is 3 in. The screw is in-14 UNC and is 5 in long, overall. Distance A is 2 in. The clamp will accommodate parts up to 4 in high. (a) What screw torque will cause the handle to bend permanently? (b) What clamping force will the answer to part (a) cause if the collar friction is neglected and if the thread friction is 0.075? ट Problem 8-7 B !!!!!!!The figure below is a schematic drawing of a shaft that supports two V-belt pulleys. The loose belt tension on the pulley at A is 15% of the tension on the tight side. The shaft material has a yield strength of 300 MPa and an ultimate tensile strength of 520 MPa. Calculate the shaft diameter.10) A screw clamp similar to the one shown in the figure has a handle with diameter in made of cold-drawn AISI 1006 steel. The overall length is 3 in. The screw is in-14 UNC and is 5 in long. overall. Distance A is 2 in The clamp will accommodate parts up to 4 in tagh. (a) What screw torque will cause the handle to bend permanenly? See sample problem 10.1, sections 10.4, 10.7 Given; hordle dia : 16 in L: 3in. Disa: Zin 10/29 Find: Scrcw torque ,! Assumphon : The screw torque is far cold decun AISI 1006 steel. a L: 3- 8 2.406 in %3D 4 32 T: 2.406F H:(L-3) -굵)F. 2.188F F- (2406 F: 2.188F Sy: 41 Kpsi. 32 (2-188) F TI (O.1875)3 Sy = 32M F-12:13 1bf T. 2.406 CI2:13) = 29.216f. in The lorque of the screw which will couse the scoch to bend pemorently is 29.21of. in. is 29.210f.10.