Question: The variable cross - section rod in the figure is made of two different materials. D 1 = 4 0 m m , D 2

The variable cross-section rod in the figure is made of two different materials. D1=40mm,D2=20mm, elasticity models E1=210GPa,E2=160GPa.
a) Draw the normal force diagram
b) If it is desired that the total elongation along the rod does not exceed L=2mm, calculate the maximum P value that can be applied to the system and the maximum normal force that will occur in each section in this case.
c) Find the maximum P value that the rod can safely carry if (em)1=180MPa,(em)2=140MPa.
The variable cross - section rod in the figure is

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