We wish to generalize the findings in Exercise 3.8 , and thus consider a stress field of

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We wish to generalize the findings in Exercise 3.8 , and thus consider a stress field of the general form σij = Pfij (xk), where P is a loading parameter and the tensor function fij specifies only the field distribution. Show that the principal stresses will be a linear form in P, that is, σ1,2,3 = Pg1,2,3(xk). Next demonstrate that the principal directions will not depend on P.

Data from exercise 3.8

Exercise 8.2 provides the plane stress (see Exercise 3.5) solution for a cantilever beam of unit thickness, with depth 2c, and carrying an end load of P with stresses given by:

Ox 3P 2c3 xy, y = 0, Show that the principal stresses are given by 3P 463 01.2= and the principal directions

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