Calculate the force .F. needed to punch a 1.46 cm diameter hole in a steel plate 1.27 cm thick (as shown in fig). The ultimate shear strength of steel is 345 M N//m^(2)

Calculate the force .F. needed to punch a 1.46 cm diameter hole in a s

1.	Calculate the force .F. needed to punch a 1.46 cm diameter hole in a steel plate 1.27 cm thick (as shown in fig). The ultimate shear strength of steel is 345 M N//m^(2)
Answer» Solution : As in punching, SHEAR elasticity is involved, the hole will be punched it `((F_(11))/(A)) gt` ultimate shears streass `: F_(11) gt` (shear STRESS) X Area `F_(11) min=(3.45xx10^(8)) (2PI RL)(A=2pi rL)` `=(3.45xx10^(8))(2xx3.14)xx0.73xx10^(-2)xx1.27xx10^(-2)~~200 KN`