Abstract
Fatigue crack growth rates in complex structure depend strongly on the path of the crack. If the crack growth path avoids fastener holes or runs parallel to reinforcing members, the crack growth life can be shortened significantly. Thus a criterion for crack growth direction is the first step required for any meaningful crack growth life calculation for complex structure subjected to multiaxial cyclic stresses. No general criterion for fatigue crack growth direction is currently available for even the limited case of constant-amplitude in-phase biaxial cyclic tension loading. Existing crack growth direction criteria for static loading must be extended before they fully apply to this biaxial fatigue loading case.
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