Characterizing tensile strength of notched cross-ply and quasi-isotropic composite laminates

Jia-Lin Tsai*, Chung Wen Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This study aims to investigate fracture behaviors of notched cross-ply and quasi-isotropic laminates with different stacking configurations. The fracture criterion developed by Vaidya and Sun (1997), based on the postulation that the failure was dominated by the 0 degree ply, was adopted to characterize the failure stresses of the notched laminates. The failure mechanisms of the samples were determined through X-ray examinations. It was found that for [0/90]2s, [90/0]2s, [0/±45/90]2s, and [90/±45/0]2slaminates, the strengths were quite close to the model predictions. This occurred because there were no severe damage zones observed near the crack tip; therefore, the failure stresses of the notched laminates were dominated by the stress states of 0 degree ply, which can be properly characterized using the fracture mechanics in conjunction with the laminated plate theory. However, for [02/902]s and [902/02]s laminates, there were severe damage zones observed near the crack tip such that the predicted failures stresses were lower than the experimental data. In contrast, for the [902/±452/02]s and [02/±452/902]s, because of the edge delamination taking place within the plies, the failure stresses were considerably lower than the predictions.

Keywords

  • Composite laminates
  • Fracture mechanics
  • Notched samples
  • Tensile strength

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