1
GATE ME 2011
+2
-0.6
The shear strength of a sheet metal is $$300MPa.$$ The blanking force required to produce a blank of $$100$$ $$mm$$ diameter from a $$1.54$$ $$mm$$ thick sheet is close to
A
$$45kN$$
B
$$70kN$$
C
$$141kN$$
D
$$3500kN$$
2
GATE ME 2010
+2
-0.6
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 $$100$$ $$MPa$$ and penetration to thickness ratio is $$0.2.$$ Neglect friction

Assuming force $$Vs$$ displacement curve to be rectangular, the work done in $$J$$ is

A
$$100$$
B
$$200$$
C
$$250$$
D
$$300$$
3
GATE ME 2010
+2
-0.6
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 $$100$$ $$MPa$$ and penetration to thickness ratio is $$0.2.$$ Neglect friction

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

A
$$5$$
B
$$10$$
C
$$20$$
D
$$40$$
4
GATE ME 2008
+2
-0.6
In the deep drawing of cups, blanks show a tendency to wrinkle up around the periphery (flange). The most likely cause and remedy of the phenomenon are respectively,
A
Buckling due to circumferential compression: increase blank holder pressure
B
High blank holder pressure and high friction: reduce blank holder pressure and apply lubricant
C
High temperature causing increase in circumferential length; apply coolant to blank
D
Buckling due to circumferential compression; decrease blank holder pressure.
GATE ME Subjects
EXAM MAP
Medical
NEET