Interface Structure and Stress Analysis of Carbon Fiber Reinforced Laminated Woodceramics

To study the interface structure and loading conditions of fiber reinforced woodceramics composite, a laminated woodceramics were prepared by using liquification wood, carbon power and carbon fiber. Scanning electron microscope (SEM) and a high-revolution transmission electron microscope (HRTEM) were employed to observe the basic structure and interface, and a micro-raman spectrometer (MRS) was used to detect the G’ band shifts of stretch sample to judge the situation of interface bond. Meanwhile, the function and way of interface layer in the process of stress transfer were numerical analyzed by using Abaqus based on bilinear softening constitutive mode. The observation of SEM and HRTEM indicates the carbon fiber reinforced woodceramics presents a clear laminated structure, of which has a strong interface bonding between amorphous carbon and glassy carbon. The test of MRS show that the G’ band of pressure sintering specimen shifts to low wavenumber at high extent, which proves that pressure sintering can improve the interface bonding strength between glassy carbon and carbon fiber. The numerical analysis shows that the interface layer plays an important role in the stress transfer between carbon fiber and matrix material in the loading process. As the intension and thickness of interface layer increase, the loading and the equivalent stress transfer to matrix material increases.