Tensile properties and damage evolution of a 2.5D braided quartz/phenolic composite at elevated temperatures

doi:10.19936/j.cnki.2096-8000.20250828.007

Abstract

Abstract: Quartz/phenolic composite is a kind of thermal protection material widely used in aerospace vehicles. The study of its high temperature tensile properties and damage mechanism is of great value to the application of resin-based thermal protection materials. To this end, this paper tested the tensile properties of a 2.5D braided quartz/phenolic composite (2.5D-SiO_2f/phenolic), and the test temperature range was from room temperature to 800 ℃. Acoustic emission technology is used to dynamically monitor the damage evolution of tensile specimens at room temperature, combined with scanning electron microscope to observe the fracture morphology, and analyze its tensile damage mechanism. The results show that the tensile strength at room temperature can reach 275 MPa and the modulus can reach 17 GPa. In the range of room temperature to 800 ℃, the tensile properties of 2.5D-SiO_2f/phenolic gradually decrease with increasing temperature. It is revealed that during the 2.5D-SiO_2f/phenolic stretching process, there are mainly damage signals in the frequency range of 70~100 kHz, 220~270 kHz, 300~330 kHz, corresponding to the three damage modes of matrix cracking, fiber and matrix debonding, and fiber fracture. In this way, the evolution process of tensile damage is analyzed.

Key words: 2.5D-SiO_2f/phenolic, tensile properties, damage evolution, acoustic emission, composites

CLC Number:

TB332

JIAO Lei, RUAN Hao, SU Ruiyi, GE Zhifu, LI Mei, ZHANG Chengyu. Tensile properties and damage evolution of a 2.5D braided quartz/phenolic composite at elevated temperatures[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(8): 54-65.

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