Effect of high-temperature thermo-oxidation on the mechanical and electrical properties of phenylethynyl-terminated polyimide/carbon fiber composite

Wang, Hao; Wang, Ziqiao; Kuang, Naihang; Wu, Chao; Lu, Yu; Zhang, Chunhua

doi:10.1016/j.polymdegradstab.2023.110544

Cited by 2 publications

(1 citation statement)

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“…Numerous studies have investigated the effects of thermo-oxidative aging on composites, employing techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), and Optical Microscopy. Despite providing valuable insights into mechanical property changes, 6,7 chemical structure variations, 8,9 and microstructural evolution, 10,11 these methods lack real-time monitoring capabilities. The electrical resistance method (ERM), a non-destructive monitoring technique widely utilized in the structural health monitoring (SHM) of composite materials, 12–15 offers continuous monitoring and real-time identification of damage mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Effects of thermo-oxidative aging on progressive bending damages and electromechanical behaviors of carbon fiber/epoxy 3D woven composites

Li,

Wu,

Sun

et al. 2024

Journal of Composite Materials

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The effect of thermo-oxidative aging on mechanical properties is important to designing carbon fiber-reinforced composites serviced in long-term atmospheric environments. Here, we report the progressive bending damage behaviors of carbon fiber/epoxy 3D angle-interlock woven composites (3DAWCs) after thermo-oxidative aging. Three-point bending tests were conducted to characterize bending damage behaviors after different aging days. The electrical resistance change of 3DAWCs was also simultaneously measured with the two-probe method during three-point bending tests. Combining side image and digital image correlation (DIC) technology, we found that the bending strength and modulus deteriorated rapidly during thermo-oxidative aging. The strain distribution and progressive bending damage modes also changed significantly, i.e., a symmetrical strain distribution for the unaged specimens, while the existing interface cracks of the aged specimen changed this symmetry. The electrical resistance method (ERM) effectively identified the early-stage damages, and the first derivative of the rate of resistance change (FDC) revealed differences in the progressive damage modes of aged and unaged specimens.

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