Question: An octahedral stress plane is one whose normal makes equal angles with each of the principal axes of stress. (a) How many independent octahedral planes

An octahedral stress plane is one whose normal makes equal angles with each of the principal axes of stress. (a) How many independent octahedral planes are there at each point? (b) Show that the normal stress on an octahedral plane is given by one-third the first stress invariant. (c) Show that the shearing stress on the octahedral plane is given by 1 3 /

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