复合材料蜂窝夹芯结构单面贴补弯曲性能的分析模型与试验研究

doi:10.7527/S1000-6893.2013.0213

Abstract

Abstract:

Composite honeycomb sandwich structures are widely used in aircraft control surfaces and various fairing parts as a lightweight structural design, and their bending properties can be integrated to characterize their mechanical properties. In view of this, experimental study and numerical analysis are performed on one-side bonded composite honeycomb sandwich specimens. First, a three-point bending test is carried on damaged composite honeycomb sandwich panels with one-side bonded repair. The failure loads and strength recovery values of the structures are obtained, and the failure mechanism of the two failure modes of core crush and patch debond are analyzed. A trapezoidal constitutive relationship and failure criterion based on the quadratic stress criterion and energy release rate criterion are introduced with Hill failure criterion, Hashin fabric failure criterion and the cohesive element technique, by means of which a three-dimensional finite element analysis model of the repaired structures is established. The bending strength and failure mechanism of one-side bonded honeycomb sandwich structures are predicted and detected with the model. The numerical results show that the patch debond mode can be well simulated with the introduction of the trapezoidal constitutive relationship in the adhesive, and a good agreement is found between the numerical results and the test data, which demonstrated the validity of the proposed model. Then the effect of patch diameter and thickness on the repair is analyzed, which revealed that with the increase of patch diameter and thickness, the loading capacity of the repaired specimens first increased and then decreased.

Key words: composite materials, honeycomb sandwich panel, trapezoidal constitutive relationship, one-side bonded repair, bending behavior

CLC Number:

V214.8

LI Jianfeng, YAN Ying, LIAO Baohua, MA Jian, ZHANG Taotao, LIU Bo. Analysis Model and Experimental Study of Bending Behavior of Composite Honeycomb Sandwich Structures with One-side Bonded Repair[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(8): 1884-1891.

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Analysis Model and Experimental Study of Bending Behavior of Composite Honeycomb Sandwich Structures with One-side Bonded Repair

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