Van Nostrand's eclectic engineering magazine (1869)
[New York : D. Van Nostrand] · leaf 111
99 INTERNAL STRESS IN GRAPHICAL STATICS. … If r be resolved into its normal and tensities, to find the principal stresses, tangential components ot=n and rt=t and the relative position of their planes then, n=%[a + b + (a— 5) cos 2xn], of action to each other and to the or, n=a cos2a??i + £ sin2cm, principal stresses. and, Fig. 9. tz=^ («—…
Engineering
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