High Temperature Residual Properties of Carbon Fiber Composite Sandwich Panel with Pyramidal Truss Cores
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High Temperature Residual Properties of Carbon Fiber Composite Sandwich Panel with Pyramidal Truss Cores Jiayi Liu & Zhengong Zhou & Linzhi Wu & Li Ma & Shidong Pan
Received: 3 June 2012 / Accepted: 14 June 2012 / Published online: 14 August 2012 # Springer Science+Business Media B.V. 2012
Abstract A study on the mechanical property degradation of carbon fiber composite sandwich panel with pyramidal truss cores by high temperature exposure is performed. Analytical formulae for the residual bending strength of composite sandwich panel after thermal exposure are presented for possible competing failure modes. The composite sandwich panels were fabricated from unidirectional carbon/epoxy prepreg, and were exposed to different temperatures for different time. The bending properties of the exposed specimens were measured by three-point bending tests. Then the effect of high temperature exposure on the bending properties and damage mechanism were analyzed. The results have shown that the residual bending strength of composite sandwich panels decreased with increasing exposure temperature and time, which was caused by the degradation of the matrix property and fiber-matrix interface property at high temperature. The effect of thermal exposure on failure mode of composite sandwich panel was observed as well. The measured failure loads showed good agreement with the analytical predictions. It is expected that this study can provide useful information on the design and application of carbon fiber composite sandwich panel at high temperature. Keywords Sandwich panel . High temperature exposure . Bending properties . Composite
1 Introduction Fiber reinforced plastic composite sandwich panel with lattice core construction is an attractive lightweight structure because of its high specific strength and stiffness at room temperature [1–8]. However, the degradation of mechanical properties by various environmental effects such as temperature, oxygen, moisture and pressure will occur during their service life [9–11]. Especially, the mechanical properties decrease in a significant manner when they are exposed to high temperature. Structure integrity can then be compromised. J. Liu : Z. Zhou (*) : L. Wu : L. Ma : S. Pan Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s Republic of China e-mail: [email protected]
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Appl Compos Mater (2013) 20:537–552
Therefore, knowledge on residual mechanical properties of composite sandwich panel after high temperature exposure is of particular importance. Unfortunately, the effect of high temperature exposure on mechanical behavior of composite sandwich panel has not been reported yet. However, some literatures have reported the mechanical behaviors of composite laminates after thermal exposure [12–14]. Matrix cracking and delamination have been found after thermal exposure [15–17]. High temperature exposure also leads to weight loss and decrease of the mechanical properties such as tensile, compressive and flexural failure strength [18–2
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