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3. (35p) Consider a cantilever beam of length I. and circular section of radius R. The beam is loaded in pure bending by a moment M applied at the free end a) Write the value of the deflection of the free end as predicted by linear elasticity. This is given in any Strength of Materials text and available online. Consider the Youngs modulus of the beam material to be E. Assume the beam is heated up to a homologous temperature Th which enables creep and that the creep mechanism is Coble creep at all points of the beam. Write an equation describing the evolution in time of the deflection o of the free end of the beam. b) Let us make now the problem more specific (and a bit more complicated): L-1m. R-0.1m. E-400GPa, v-0.3. Th T/Tm 0.75, the beam material is tungsten (see the mechanism map below, Fig. 2) and the applied moment is M- 120 kNm. What can you say about the deflection of the free end, o? Consider only the initial stages of creep. i.e. without accounting for large deformations.

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