Question 8 A 1 cm diameter cylindrical rod, fabricated from 2014-T6 aluminium is subjected to cyclic loading along its axle. During operation, it is subjected to reversed cyclic loading and the maximum tensile load is +15.7 kN. (a) Apply quantitative analysis to calculate the maximum stress, minimum stress, average stress experienced by this cylindrical rod. (5 marks) (b) Estimate its fatigue life by applying the S-N curve shown in Figure Q8. (2 marks) (c) If the design fatigue life for the aluminium rod is specified to be 1x 107 cycles, analyse the maximum tensile force and compressive force allowable on this aluminium cylindrical rod. Assume reversed cyclic loading is maintained. SINGAPORE UNIVERSITY OF SOCIAL SCIENCES (SUSS) EAS203 Stress amplitude, S (MPa) 500 400 1045 steel 300 200 2014-T6 aluminum alloy 100 0 103 104 105 106 Red brass 107 Cycles to failure, N Figure 08 108 109 1010 (5 marks) Page 4 of 6 Tutor-Marked Assignment