In a sheet metal of $2$ mm thickness a hole of $10$ mm diameter needs to be punched. The yield strength in tension of the sheet material is $100$ MPa and its ultimate shear strength is $80$ MPa. The force required to punch the hole (in kN) is

Q. Determine the load required to punch a $20mm$ diameter hole in a $2mm$ thick sheet. The properties of the material of the sheet are:
Tensile strength $-580MPa$
Yield strength in tension $-410MPa$
Shear strength $-350MPa$
Yield strength in shear $-250MPa$
The load is $kN$ is

Q. It is required to punch a hole of diameter $10mm$ on a sheet of thickness $3mm$, The shear strength of the work material is $420MPa$. The required punch force is

Q. A rectangular hole of size $100$ mm $timses$ $50$ mm is to be made on a $5$ mm thick sheet of steel having ultimate tensile strength and shear strength of $500$ Mpa and $300$ MPa, respectively. The hole is made by a punching process. Neglecting the effect of clearance, the punching force (in kN) is

Q. Circular blanks of $10$ mm diameter are punched from an aluminium sheet of $2$ mm thickness. The shear strength of aluminum is $80$ MPa. The minimum punching force required in kN is

Q. A sheet of thickness 2.25 mm, ultimate shear stress of 420 MPa is to be punched out using a punch having allowable crushing strength of 1260 MPa and factor of safety of 2. The minimum diameter of the hole punched is