A circular aluminum tube with pinned ends supports a load P = 18 kN acting at distance

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A circular aluminum tube with pinned ends supports a load P = 18 kN acting at distance e = 50 mm from the center (see figure). The length of the tube is 3.5m and its modulus of elasticity is 73 GPa.
If the maximum permissible stress in the tube is 20 MPa,what is the required outer diameter d2 if the ratio of diameter is to be d1/d2 = 0.9?
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Mechanics of Materials

ISBN: 978-0495438076

7th edition

Authors: James M. Gere, Barry J. Goodno

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