A plastic rod AB of length L = 0.5 m has a diameter d1 = 30 mm

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A plastic rod AB of length L = 0.5 m has a diameter d1 = 30 mm (see figure). A plastic sleeve CD of length c = 0.3 m and outer diameter d2 = 45 mm is securely bonded to the rod so that no slippage can occur between the rod and the sleeve. The rod is made of an acrylic with modulus of elasticity E1 = 3.1 GPa and the sleeve is made of a polyamide with E2 = 2.5 GPa.
(a) Calculate the elongation δ of the rod when it is pulled by axial forces P = 12 kN.
(b) If the sleeve is extended for the full length of the rod, what is the elongation?
(c) If the sleeve is removed, what is the elongation?
di D B A P
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Mechanics of Materials

ISBN: 978-0495438076

7th edition

Authors: James M. Gere, Barry J. Goodno

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