In this experiment, the student will be applying torsion to a mild steel round bar. The bar will twist until it will fracture. The torque will be applied gradually and at a constant speed. The rotation will be measured at specific load intervals so that a plot of torque T versus rotation can be done. This data is then used to plot torsional shear stress versus shear strain . Before the experiment begins, students will measure the bar's diameter and will trace a white or a yellow straight line along the length of the bar. This is done so that a spiral can be seen as a result of the torque. The final length of the bar will increase if we were to unwind the spiral. Mechanica