Dynamic temperature field and drilling damage mechanism of plain woven carbon/glass hybrid composites

Abstract

Hybrid structures are increasingly important in joints of composite components. For carbon, glass, and bilateral carbon/glass hybrid composites, a thermal-mechanical characterization experimental study was implemented to explore the hybrid effect on the drilling temperature evolutions and damage mechanism. Infrared thermography was applied to analyze the temperature distribution from the side and exit surface of the composites. The results indicate that the hybrid structure generated an abrupt change of thrust force during drilling the carbon/glass interfacial region and the maximum peak force was induced in 5C5G specimen. The temperature isothermal on the side surface of hybrid composites gradually evolved into a trapezoidal shape. The variations of hole positions on the plain fabric structure can affect the temperature generation and heat transfer. The carbon layer can prevent bending deformation and act as a support in drilling the last layer of 5G5C and showed better performance. Severe damage was induced for the less mechanical strength in the glass layer and low heat dissipation of exit material leading to concentrated heat. Accumulated high temperature reduced the bonding strength between the fiber and resin, and thus the debonding, matrix smearing and resin strips occurred.