Which one of the following statements regarding principal stresses and maximum shear stress is not true?
Select one:
a. If the maximum shear stress is equal to the maximum normal stress, the part is experiencing a pure torsional load.
O b. When shear stress reaches its maximum value, normal stresses are zero.
C. On a part under load, the angle between the condition of principal stress and the condition of maximum shear stress is always 45°.
O d. When normal stresses reach their principal values, the shear stress is zero.
Answer:
all of these options are right