Compressive Failure Of Aluminum Based Composite Reinforced With Graphite Fibers

Abstract:

Continuous carbon fiber reinforced aluminum matrix composites (Cf/Al) have high properties such as high specific strength and stiffness, low coefficient of thermal expansion and high heat conductivity, therefore, they have wide potential application in the fields of avigation and spaceflight. The compressive strength is one of the most important properties of MMCs, especially for the structure components, such as the wings and fuselage of aircrafts.The 6061 Al matrix composite reinforced by M40J graphite fibres which are put along the 0° or 0° and 90° alternately directions were fabricated using pressure permeation casting method. Compressive properties were measured on INSTRON5569 electron tension tester with 1mm/min loading rate. The macro and micro morphologies of failure surfaces were observed by Olimpas microscope and S570 scanning electron microscope. The compressive strength along 0° and 0°/90° directions of two composites with different arranged fibres are 1352MPa and 584MPa, respectively, and the compression modulus are 245GPa and 120GPa, respectively, through compression test. The compressive failure process and mechanism are disscused based on the analysis of failure surfaces. Under the compression load, the fibres parallel to the loading direction are the major bearing body, and the failure models of the single 0° laminated composite and the 0°/90° laminated composite are shear break and bending break, respectively, under compression.

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