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lu = 4.421 x 10"6, lr = 0.659 x 10"6 m4 and A = [(76 x 13) + (114 x 13)]10"6 = 2.47 x 10"3 m2

I (4.421 x 10"6\ ku = J[ -r = 0.0423 = 42.3 mm y V 2A1 x 10 /

The momental ellipse can now be constructed as described above and drawn in Fig. 1.17 and by measurement h = 22.3 mm

Then /N A. = Ah2 = 2.47 x 10"3 x 22.32 x 10"6

(This value may also be obtained from Mohr's circle of Fig. 1.18.) The stress at B is then given by

MNAn

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