针刺C/C复合材料拉伸强度及渐进失效数值预测

doi:10.7527/S1000-6893.2016.0107

Abstract

Abstract:

Based on the observation of microstructures of needled C/C composites, a unit cell model which considered the true distribution of the fibers was established to predict the tensile strength and progressive damage. The finite element method (FEM) simulation of the tensile failure of the composites was conducted by using the failure criterion proposed by Linde and periodic displacement boundary conditions. The damage evolution of the composites was analyzed, which was subject to the longitudinal tensile load, and the tensile strength was predicted. By doing a quasi-static tensile test, the rupture surface of needled C/C composites was observed by scanning electron microscope (SEM). The numerical prediction was in good agreement with the test results. Quasi brittle fracture occurred under tensile load, and the stress-strain curve approximately presented bilinear shape. 0° weftless plies suffered from fiber breakage and matrix cracking damage, and 90° weftless plies from matrix damage. The final fracture occurred in the regions where the in-plain fiber and the needled fiber intersected.

Key words: needled C/C composites, unit cell model, tensile strength, progressive damage, FEM

CLC Number:

V254
TB332

TAN Yongyang, YAN Ying, LI Xin, GUO Fangliang. Numerical prediction of tensile strength and progressive damage of needled C/C composites[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(12): 3734-3741.

References

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Numerical prediction of tensile strength and progressive damage of needled C/C composites

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