Abstract
This chapter discusses the stress-based multiaxial fatigue analysis. Multiaxial cyclic stresses at high stress concentration areas can be commonly found in structures under multiaxial cyclic loads. Due to geometric constraints at notches, multiaxial loads can result in either a uniaxial stress state as applied to a notched thin metal sheet or in a multiaxial stress state as applied to a notched shaft or rod. Overall, multiaxial cyclic loading can be classified into two categories: nonproportional and proportional loading. Nonproportional loading is the multiaxial loading paths that cause the principal stress axis or maximum shear stress axis of a local element to rotate with time and with respect to a local coordinate system. On the other hand, proportional loading will result in a stationary principal stress axis or maximum shear stress axis.
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