Concept quiz on stress transformation

What are the principle stresses?

• The orientation of an inclined plane (on which the normal and shear stress components

• two normal stress components

• Mohr's circle

• the maximum and minimum normal stress at the point.

Determine the average normal stress

• -35 MPa

• -20 MPa

• 90 MPa

• 35 MPa

What are principal planes?

• Angle of rotations when the shear stress is maximum.

• Angle of rotations where the normal stress is either maximum or minimum.

• Planes at average normal stress.

• None of the above

The stress state is not changing when we rotate the stress element.

• True

• False

When the element reaches principal stress the value of shear stress is zero.

• True

• False

The maximum shear stress is obtained when the element is rotated to the principal plane.

• True

• False

The maximum shear stress will be 90^o from the position of an element that is subjected to the principal stress.

• True

• False

When the element reaches maximum in-plane shear stress, the normal stresses are equal to.....

• Minimum normal stress

• Maximum normal stress

• Average normal stress

• None of the above