For the rotating disk problem given previously in Example 8.11, the governing equilibrium equation was given by

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For the rotating disk problem given previously in Example 8.11, the governing equilibrium equation was given by (8.4.74). Since this equation is also valid for anisotropic materials, consider the polar-orthotropic case and use equations (11.7.3) to express the equilibrium equation in terms of the displacement as:

du Ee +r+ dr Er dr Next show that the general solution to this equation is given by (1 - Vrever) E,[9 -

Data from example 8.11

As a final example in this section, consider the problem of a thin uniform circular disk subject to constant

y a 00 X

The solution can be efficiently handled by using a special stress function that automatically satisfies the

Recall that the more general polar coordinate case was given as Exercise 7.17. Using Hooke's law for planeDimensionless Stress 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0 V = 0.3 %/paa 0fpwa 0.1 0.2 0.3 0.4 0.5 0.6

For a solid disk, the stresses must be bounded at the origin and so C = 0. The condition that the disk is

Equation 8.4.74

do, Or + dr r 08 + pwr=0

Equation 11.7.3

or Er 1 - vervre du U + ver dr g= Eg 1- vervre ; (  +  du dr Vre



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