Mechanical Behavior and Failure Mechanisms of Carbon Fiber Composite Pyramidal Core Sandwich Panel after Thermal Exposure  

作　　者：Jiayi Liu Zhengong Zhou Linzhi Wu Li Ma 

机构地区：[1]Center for Composite Materials and Structures,Harbin Institute of Technology

出　　处：《Journal of Materials Science & Technology》2013年第9期846-854,共9页材料科学技术（英文版）

基　　金：financial support of the project from the Major State Basic Research Development Program of China (No. 2011CB610303);the National Natural Science Foundation of China (Nos. 90816024 and 11272105);the Research Fund for the Doctoral Program of Higher Education of China (No. 20092302110006)

摘　　要：An attempt has been made here to evaluate the effect of thermal exposure on the mechanical behavior and failure mechanisms of carbon fiber composite sandwich panel with pyramidal truss core under axial compression. Analytical formulae for the collapse strength of composite sandwich panel after thermal exposure were derived. Axial compression tests of composite laminates and sandwich panels after thermal exposure were conducted at room temperature to assess the degradation caused by the thermal exposure. Experimental results showed that the failure of sandwich panel are not only temperature dependent, but are time dependent as well. The decrease in residual compressive strength is mainly attributed to the degradation of the matrix and the degradation of fiber-matrix interface, as well as the formation of cracks and pores when specimens are exposed to high temperature. The measured failure loads obtained in the experiments showed reasonable agreement with the analytical predictions.An attempt has been made here to evaluate the effect of thermal exposure on the mechanical behavior and failure mechanisms of carbon fiber composite sandwich panel with pyramidal truss core under axial compression. Analytical formulae for the collapse strength of composite sandwich panel after thermal exposure were derived. Axial compression tests of composite laminates and sandwich panels after thermal exposure were conducted at room temperature to assess the degradation caused by the thermal exposure. Experimental results showed that the failure of sandwich panel are not only temperature dependent, but are time dependent as well. The decrease in residual compressive strength is mainly attributed to the degradation of the matrix and the degradation of fiber-matrix interface, as well as the formation of cracks and pores when specimens are exposed to high temperature. The measured failure loads obtained in the experiments showed reasonable agreement with the analytical predictions.

关 键 词：COMPOSITE Thermal exposure Mechanical properties Sandwich panel 

分 类 号：TB33[一般工业技术—材料科学与工程]