Steel tubes are tested in the quality control division of the company. The compression and torsion test are performed on a 60 mm-diameter steel tube with a wall thickness of 3 mm and a length of 300 mm. The compression test is shown in Figure 1, which shows that the sample has been rotated by an angle, a. Determine the following: YG Pj Compression testing sample XG Pi Figure 1. Compression Test Q1) Write the local element equation for the test sample if it is modelled by an axial bar element and give your answers to TWO decimal places. [2%] {P} = [...] 106 N/m {u} Q2) Write the element equation in terms of the global coordinate frame shown, XG - YG, if = 150. Give your answers to TWO decimal places. [4%] Uix Pix Uiy Piy = [...] 106 N/m Ujx Pjx ujy Pjy) Q3) Calculate the stress, , and strain, , in the test sample if p & p; are 550 N. Give your answers to TWO decimal places. [4%] = MPa = 10-6