Show that the distortional strain energy given by (6.1.17) is related to the octahedral shear stress (3.5.4)

Question:

Show that the distortional strain energy given by (6.1.17) is related to the octahedral shear stress (3.5.4)2 by the relation:

Ud 31+v 2 E oct 3 4 oct

Equation 6.1 .17

Ua 121 [(x  a) + (ay  0) + (0  0x) + 6(y + 3 +2)] -

Equation 3.5 .4

N = 0 oct -3 (0 + 0 +03) = 30kk = 3/1 S = Toct = 1/[(0-0) + (0-03) + (03-0) ] /2 = (217-612) /2

Results from Exercise 3.5 may be helpful.

Data from exercise 3.5 

A two-dimensional state of plane stress in the x, y-plane is defined byσz = τ yz = τ zx = 0. Using general principal value theory, show that for this case the in-plane principal stresses and maximum shear stress are given by:

91,2 = Tmax= x + y 2  (ox-ay 2 0x - ay 2 2 + ty xy 2 +

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