Machine Design Questions and Answers – Eccentric Loaded Bolted Joints
In the following figure, two plates are fastened by means of two bolts. The yield strength of bolt is 400N/mm² and factor of safety is 4. Determine the permissible shear stress in the bolts.
a) 100N/mm²
b) 50N/mm²
c) 25N/mm²
d) 75N/mm²
Homework Answers
Answer: b
Explanation: Permissible hear stress=0.5 x 400 /4 =50N/mm².
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Machine Design Questions and Answers – Eccentric Loaded Bolted Joints
Machine Design
A wall bracket is attached to the wall by means of 2 identical bolts, one at A and one at B. The force of 20kN acts at a distance of 400mm. Bolt A lies at a distance of 50mm from axis of tilt and bolt B 500mm. Allowable shear stress in the bolts is 100N/mm² and tensile is 40N/mm². Find the radius of Mohr circle which can be made from the shear stress and tensile stress acting on bolts.(Consider bolt...
Machine Design
A wall bracket is attached to the wall by means of 2 identical bolts, one at A and one at B. The force of 20kN acts at a distance of 400mm. Bolt A lies at a distance of 50mm from axis of tilt and bolt B 500mm. Allowable shear stress in the bolts is 100N/mm² and tensile is 40N/mm². Which bolt is used a criterion for designing?a) Ab) Bc) A or Bd) None of the listed
Q-2 For a bolted assembly with six bolts, the stiffness of each bolt is kb =...
Q-2 For a bolted assembly with six bolts, the stiffness of each bolt is kb = 525 kN/mm and the stiffness of the members is km = 2100 kN/mm per bolt. An external load of 350 kN is applied to the entire joint. Assume the load is equally distributed to all the bolts. It has been determined to use M12x1.75 mm, property class 9.8 bolts with rolled threads. Assume the bolts are preloaded to 75 percent of the proof load....
The shaft in the figure below is supported on journal bearings that do not offer any resistance t...
The shaft in the figure below is supported on journal bearings that do not offer any resistance to axial load. The yield strength of the material is o",-300 MPa and the safety factor is FS-2.5 Derive an expression for the components of the stress tensor at a cross section of the shaft Neglect the shear stress due to the transverse shear forces and determine to the nearest millimeter, the smallest diameter of the shaft that will support the loading strength....
Machine Design
A flange of radius 200mm is fastened to the machine screw by means of four cap screws of pitch circle radius 150mm. The external force P is 20kN which is loaded at 160mm from the machine screw. There are two dowel pins to take shear load. Determine the core diameter of cap screw if permissible tensile stress in cap screw is 40N/mm².a) None of the listedb) 11.21mmc) 12.33mmd) 14.12mm
4- The joint is fastened together using two bolts. Determine the required diameter of the bolts...
4- The joint is fastened together using two bolts. Determine the required diameter of the bolts if the failure shear stress for the bolts is fail = 350 MPa. Use a factor of safety for shear of F.S. = 2.5. 30 mm 80 KN 30 mm 40 KN 40 KN
Question 3 For the simply supported steel beam with cross section and loading shown (see Figure...
Question 3 For the simply supported steel beam with cross section and loading shown (see Figure 3a), knowing that uniformly distributed load w=60 kN/m, Young modulus E = 200 GPa, and yield stress Cyield=200 MPa (in both tension and compression). ул 15 mm w=60 kN/m ... 1 B A 15 mm + 300 mm IC - i 2.5m 1 1 15 mm 7.5m 1 150 mm Figure 3a (a) Check if: the beam is safe with respect to yielding (using...
2. (2 marks) Consider a pre-loaded threaded bolted joint subjected to static load P as shown...
2. (2 marks) Consider a pre-loaded threaded bolted joint subjected to static load P as shown in the figure below. This figure shows one of the bolts of a threaded joint that is part of a group of uniformly loaded bolts. The bolt is a SA Grade 4 bolt having a major diameter d0.375 in and the pitch p - 0.0625 in. The two steel members, marked 2 and 3 in the figure below, have the thickness of 0.5 in...
4. (a) Design a bolted joint to join the two members shown in the figure below. Specify the number of bolts, the pattern, the bolt grade, and the bolt size 8 x4 x 12 Box sect 4 in 6in 0.50 in ty...
4. (a) Design a bolted joint to join the two members shown in the figure below. Specify the number of bolts, the pattern, the bolt grade, and the bolt size 8 x4 x 12 Box sect 4 in 6in 0.50 in typical 0.50 plate 12 000 lb P (b). Two steel plates are joined using 3/8-inch parallel-loaded fillet welds. The yield strength, Sy, and the length of the welds are known. The design factor is 3.5. Determine the maximum tensile...
Machine Design
Given data for bracket is P=20kN, e=100mm, S(yt)=400N/mm², FS=3. Find the direct shear stress in bolts if diameter=18mm.a) 16.9N/mm²b) 19.6 N/mm²c) 78.6 N/mm²d) 76.8 N/mm²
A wall bracket is attached to the wall by means of 2 identical bolts, one at A and one at B. The force of 20kN acts at a distance of 400mm. Bolt A lies at a distance of 50mm from axis of tilt and bolt B 500mm. Allowable shear stress in the bolts is 100N/mm² and tensile is 40N/mm². Find the radius of Mohr circle which can be made from the shear stress and tensile stress acting on bolts.(Consider bolt...
A wall bracket is attached to the wall by means of 2 identical bolts, one at A and one at B. The force of 20kN acts at a distance of 400mm. Bolt A lies at a distance of 50mm from axis of tilt and bolt B 500mm. Allowable shear stress in the bolts is 100N/mm² and tensile is 40N/mm². Which bolt is used a criterion for designing?a) Ab) Bc) A or Bd) None of the listed
The shaft in the figure below is supported on journal bearings that do not offer any resistance to axial load. The yield strength of the material is o",-300 MPa and the safety factor is FS-2.5 Derive an expression for the components of the stress tensor at a cross section of the shaft Neglect the shear stress due to the transverse shear forces and determine to the nearest millimeter, the smallest diameter of the shaft that will support the loading strength....
4- The joint is fastened together using two bolts. Determine the required diameter of the bolts if the failure shear stress for the bolts is fail = 350 MPa. Use a factor of safety for shear of F.S. = 2.5. 30 mm 80 KN 30 mm 40 KN 40 KN
Question 3 For the simply supported steel beam with cross section and loading shown (see Figure 3a), knowing that uniformly distributed load w=60 kN/m, Young modulus E = 200 GPa, and yield stress Cyield=200 MPa (in both tension and compression). ул 15 mm w=60 kN/m ... 1 B A 15 mm + 300 mm IC - i 2.5m 1 1 15 mm 7.5m 1 150 mm Figure 3a (a) Check if: the beam is safe with respect to yielding (using...
2. (2 marks) Consider a pre-loaded threaded bolted joint subjected to static load P as shown in the figure below. This figure shows one of the bolts of a threaded joint that is part of a group of uniformly loaded bolts. The bolt is a SA Grade 4 bolt having a major diameter d0.375 in and the pitch p - 0.0625 in. The two steel members, marked 2 and 3 in the figure below, have the thickness of 0.5 in...
4. (a) Design a bolted joint to join the two members shown in the figure below. Specify the number of bolts, the pattern, the bolt grade, and the bolt size 8 x4 x 12 Box sect 4 in 6in 0.50 in typical 0.50 plate 12 000 lb P (b). Two steel plates are joined using 3/8-inch parallel-loaded fillet welds. The yield strength, Sy, and the length of the welds are known. The design factor is 3.5. Determine the maximum tensile...
Given data for bracket is P=20kN, e=100mm, S(yt)=400N/mm², FS=3. Find the direct shear stress in bolts if diameter=18mm.a) 16.9N/mm²b) 19.6 N/mm²c) 78.6 N/mm²d) 76.8 N/mm²
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