二维叠层C/SiC复合材料低能量冲击损伤实验

doi:10.7527/S1000-6893.2020.24202

Abstract

Abstract: C/SiC composites as high-temperature resistant materials in the fields of aeronautics and astronautics will encounter low-energy impact sources in their service environment. This paper systematically reveals the impact resistance performance of 2D laminated C/SiC composite materials using drop-weight impact equipment. We study the impact resistance with different prefab thickness and structure thickness under different impact energy conditions. The structure damage is analyzed by the CT nondestructive testing technology, showing that the impact load can be divided into three stages: linear elasticity, yield, and rebound. Typical forms of impact damage include matrix crushes, delamination, fiber fractures and matrix microcracks. With the same structure thickness, C/SiC composites with larger ply thickness have less impact deformation, less impact damage and higher impact impedance. For the same ply thickness, C/SiC composites with larger total thickness have less impact damage and larger impact impedance. Therefore, the number of prefabricated layers and structural thickness of C/SiC composites are sensitive to low energy impact sources. Thus, we can improve the impact resistance of C/SiC composites by reducing the thickness of the prefab and increasing the total thickness of the structure.

Key words: C/SiC, low velocity impact, low energy level impact, CT, damage

CLC Number:

LIU Bin, GAO Yidi, TAN Zhiyong, YE Fang, CHENG Laifei. Low energy level impact damage on 2D C/SiC composites: Experimental study[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(2): 224202-224202.

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Low energy level impact damage on 2D C/SiC composites: Experimental study

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