Using the results from Exercise 7.6 , eliminate the stresses from the plane stress equilibrium equations and

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Using the results from Exercise 7.6 , eliminate the stresses from the plane stress equilibrium equations and develop Navier equations (7.2.5). Also, formally establish the Beltramie-Michell equation (7.2.7).

Data from exercise 7.6 Invert the plane stress form of Hooke’s law (7.2.2) and express the stresses in terms of the strain components:

dy || E 1- -(ex + vey) E 1-2 E 1+v -(ey + vex) exy

Equation 7.2 .2

ex = = (0x - voy) 1 E ey ez exy (ay - vox) - 17/7 (0x + 0) = ay) 1 + v E V 1 - 2 ( 1-v -(ex + ey) -Txy, exz =

Equation 7.2 .5

uTu+ uT2V+ /  +  E 2(1 - v) x  E d (du dv + 2(1-)    + Fx = 0 + Fy = 0

Equation 7.2 .7

v{ + @y) = -{1+v) ( F x F y dy + dx

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