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(Solved): plz with details The hammer drill is jammed in a high strength concrete column and is subjected to t ...
plz with details
The hammer drill is jammed in a high strength concrete column and is subjected to the force shown. The hammer drill electrical motor is able to provide a torque of \( 100 \mathrm{Nm} \) at \( 500 \mathrm{rpm} \). The bit consist of circular segment, which has a diameter of \( 2 \mathrm{~cm} \) and made of Gray Cast Iron ASTM 20. A friction torque of bit with concrete can be expressed by 500 \( \mathrm{Nm} / \mathrm{m} \) and with steel by \( 1270 \mathrm{Nm} / \mathrm{m} \). a-a. (25P) Question 2: Please, determine the principal stress and maximum in-plane shear stress including their angles on the cross section of the bit at section a-a and draw the Mohr circle for theses stresses. (2OP)
Expert Answer
Torque = 100 N. m using formulae stress1 = force/area = 0.018mpa stress2 = (32*M)/(pi*d^3) = 38.1Mpa shear stress = (16*T)/(pi*d^3) = 63.3