For any state of stress the principal planes are planes on w

For any state of stress, the principal planes are planes on which __________.

For any state of stress, the principal planes are planes on which _____. no shear stresses act the shear stresses are maximum no normal stresses act the normal and shear stresses are maximum

Solution

1) principal planes are planes on which NO shear stresses act.(shear stress is zero on principle planes)

But for maximum shear stress plane, there may have normal stresses.