QUESTION 4 A composite pipe of length L1 was tightly fitted around the shaft of an M12 bolt before it was clamped between the nut and the head. The clamping force was measured to be Fonce the nut was tightened. If the bolt's thread is 1 mm, with the help of the DSM, calculate how many rotations (or portions of it) the nut travelled during the tightening. For data, please use the given expressions, where n is the last non-zero digit of your student number. Data: E₁=nx 0.25 x 10" [Pa] E₂ = (n/1.5) x 10" [Pa] t₁ = n [mm] t₂ = n x 0.75 [mm] L₁= nx 65 [mm] F=nx 0.4 x 1.2 [kN] L1

Fig: 1