In this article, (and video above), we calculate the total elongation of a mixed-marital assembly to give you a better understanding of what you can expect during the FE exam. This week’s problem was created and solved by Enrique Ivers, an Engineer in Training.
A solid round steel rod 6 mm in diameter and 400 mm long is rigidly connected to the end of a square brass rod 25 mm on a side and 350 mm long. The geometric axes of the bars are along the same line. An axial tensile force of 5 kN is applied at the extreme ends of the assembly. For steel, E = 200 Gpa and for brass, E = 90 Gpa. Determine the total elongation for the assembly.