Prediction of kink width in compressed fiber composites. (English) Zbl 0873.73049

The authors predict the size of the kink band width that occurs in compressive failure of a fiber composite by microbuckling. It is supposed that the composite is inextensible in the fiber direction and deforms as a Ramberg-Osgood solid under shear and transverse tensions. The kink width is assumed to be a function of fiber diameter, modulus and strength, the material nonlinearity of the composite, and the amplitude and wavelength of the fiber waviness. The authors show that the kink width is of the same scale as the fiber diameter, but very sensitive to the variations in material properties and in the amplitude of fiber waviness. They observe that for a typical polymer matrix composites the predicted kink width is of the order of 10-15 fiber diameters. Finally, the couple stress theory is used to assess the effect of fiber bending resistance on the compressive strength of fiber composites that fail by microbuckling.


74E30 Composite and mixture properties
74R99 Fracture and damage
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