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1.
In a shear cutting operation, a sheet of 5mm thickness is cut along a length of 200mm. The cutting blade is 400mm long and zero-shear (S=0) is provided on the edge. The ultimate shear strength of the sheet is 100MPa and penetration to thickness ratio is 0.2. Neglect friction.
[1] Assuming force vs displacement curve to be rectangular, the work done (in J) is
[2 marks]
(A) 100
(B) 200
(C) 250
(D) 300[2] A shear of 20mm (S=20mm) is now provided on the blade. Assuming force vs displacement curve to be trapezoidal, the maximum force (in kN) exerted is
[2 marks]
(A) 5
(B) 10
(C) 20
(D) 40asked in Mechanical Engineering, 2010
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2.
A massless beam has a loading pattern as shown in the figure. The beam is of rectangular cross-section with a width of 30mm and height of 100mm.
[1] The maximum bending moment occurs at [2 marks]
(A) Location B
(B) 2675mm to the right of A
(C) 2500mm to the right of A
(D) 3225mm to the right of A[2] The maximum magnitude of bending stress (in MPa) is given by [2 marks]
(A) 60.0
(B) 67.5
(C) 200.0
(D) 225.0asked in Mechanical Engineering, 2010
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