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Q5: A hydraulic punching machine is used to make holes in a plate using two steel...

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Civil Engineering

Q5: A hydraulic punching machine is used to make holes in aplate using two steel punches having different diameter. Byapplying a compressive stress of 37 x103 kN/m2 using a punch ofdiameter 50 mm, the maximum shear stress developed in the plate wasfound to be 290 N/mm2. Suggest the value for thickness for theplate suitable for this loading condition.
What will be the change in the shear stress when a compressiveforce of 85 kN is applied on the plate of same thickness usinganother punch having diameter 12% more than the first one? Checkwhich one of the steel punches used is safe against shear, if thepermissible safe shear stress on the plate based on the designconditions is limited to 300 N/mm2. Based on the results, discusshow the thickness of the plate and the diameter of the punch can bemodified to withstand the safe
shear stress

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