Fatigue behavior of continuous fiber reinforced composites under multiaxial loading

3 Fatigue behavior of continuous fiber reinforced composites under multiaxial loading 

The amount of data generated under global (external) multiaxial loading can be used as reference to discuss the influence of the main design parameters on the fatigue strength 

Geometrical stresses, however, are not fully representative of the degree of multiaxiality acting at a local level, which instead can be quantified, more efficiently, by stresses in the material coordinate system. Indeed, the variation of the off-axis angle can be seen even as a variation of the local degree of multiaxiality represented by the biaxiality ratios Ai and 

3 MPa down to 68.4 MPa, with the clear indication that, even in the presence of a limited shear stress component, the decrease in fatigue properties can be significant. 

Anderson et al. [20] studied the effects of combined cyclic tension or compression loading and torsional loading on [ 30/90]s aramid/epoxy tubes. They reported that in the case of predominandy axial loading the combinafion with a small torsion 

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