Study on effect of laminate thickness on bridging and interlaminar fracture toughness

Abstract

Abstract: Accurate simulation and analysis of delamination propagation behavior of composite laminates is extremely significant for the structural design of laminates. In view of the deficiency that the existing research does not quantitatively describe the relationship between mode Ⅰ interlaminar fracture toughness and laminate thickness, a plane strain model was established with the help of ABAQUS finite element software. The iterative method was used to determine the influence of specimen thickness on the traction separation behavior in the bridging zone by controlling the ratio of the thickness to the layer number. At the same time, considering the cohesive constitutive relationship,when the thickness was 2, 4 and 8 mm,the delamination propagation behavior of unidirectional carbon/epoxy composites was studied by finite element method. The results show that the steady-state fracture toughness become higher with the increase of specimen thickness. However, the initial fracture toughness is independent of specimen thickness. The effect of specimen thickness on interlaminar fracture toughness of laminates is further verified, and the analytical results are in good agreement with the experimental values.

Key words: thickness, fiber bridging, composite materials, R-curve, fracture tenacit

CLC Number:

TH114
TB332

ZHANG Yong-gui, MA Qi-wen, LIU Jian-hui. Study on effect of laminate thickness on bridging and interlaminar fracture toughness[J]. Journal of Lanzhou University of Technology, 2022, 48(4): 43-48.

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