Bending Properties and Failure Mechanisms of Tapered 3D Braided Composites
Tapered 3D braided composites are prepared by column yarn-reduction technique, unit yarn-reduction technique and cutting, respectively. Bending properties in the tapered regions of the composites are obtained by three-point bending tests, and SEM photographs of the fracture surfaces are observed to analyze the failure mechanisms. Results show that bending modulus and bending strength of the yarn-reduction composites are significantly higher than those of the cut composites, and the unit yarn-reduction composites are slightly stronger than the column yarn-reduction composites. The saw-tooth propagation of matrix crackings and interfacial debondings are the primary failure mechanisms of the yarn-reduction composites, while yarn breakages and yarn pulling-outs are the main failure modes of the cut composites.
Xiaoming Qian and Huawu Liu
C. C. Cheng et al., "Bending Properties and Failure Mechanisms of Tapered 3D Braided Composites", Advanced Materials Research, Vols. 332-334, pp. 1468-1471, 2011