The car bumper is made of polycarbonate-polybutylene
Chapter 14, Problem 14-71(choose chapter or problem)
The car bumper is made of polycarbonate-polybutylene terephthalate. If E = 2.0 GPa, determine the maximum deflection and maximum stress in the bumper if it strikes the rigidpostwhenthecariscoastingatv = 0.75 m/s.Thecarhas a mass of 1.80 Mg, and the bumper can be considered simply supported on two spring supports connected to the rigid frame of the car. For the bumper take \(I=300\left(10^{6}\right) \mathrm{mm}^{4}\), \(c=75 \mathrm{~mm}, \sigma_{Y}=30 \mathrm{MPa} \text { and } k=1.5 \mathrm{MN} / \mathrm{m}\).
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