针刺密度对碳/碳复合材料力学行为影响的仿真分析

doi:10.11896/cldb.23120170

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Abstract The optimal control of needle punching process parameters is very important to improve the mechanical properties of carbon/carbon compo-site. The development of “virtual reality test” method based on simulation technology can quickly and concurrently optimize the optimal combination of needle punching process parameters. In this work, the unit cell model of needle-punched C/C composites (NP C/C) with different needling densities (25 pin/cm², 36 pin/cm², 64 pin/cm² and 100 pin/cm²) is established, and the maximum stress criterion and Hashin failure criterion are applied to the failure analysis of fiber web layer and weft-free layer, respectively, based on the periodic boundary condition. The mechanism of the influence of the needling density on the damage failure mode and mechanical behavior of NP C/C is analyzed. It is found that with the increase of loading, the cracks first appear at the circumferential boundary of the needle-punched fiber bundle in both the fiber web layer and the weft-free layer. Moreover, the cracks appear a “Cross” type which is nearly ±45° with the direction of loading. For C/C composite with higher needled density, the proportion of damage area caused byneedle-punched fiber bundles is higher, making it more prone to transverse cracks perpendicular to the loading direction, thereby weakening the material’s load-bearing capacity. Compared to 25 pin/cm², the fracture strength of NP C/C with needle density of 36 pin/cm², 64 pin/cm², and 100 pin/cm² decreases by 3%, 5%, and 19%, respectively. In addition, the results of secant stiffness degradation indicate that the mechanical behavior of NP C/C exhibits non-linearity before failure. This is mainly caused by progressive cracking damage during the tensile process. The model established in this paper can be used to guide the optimal design of the preform of NP C/C.

Key words： C/C composite needle-punched technological parameter unit cell mechanical property

Published: 10 May 2025 Online: 2025-04-28

CLC number:

TB332

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	Articles by authors
	DONG Hongnian
	YANG Ming
	LIN Tianyi
	CHEN Peiran
	WEI Tingting

Cite this article:

DONG Hongnian,YANG Ming,LIN Tianyi, et al. Effects of Needle Density on Mechanical Behavior of Carbon/Carbon Composite[J]. Materials Reports, 2025, 39(9): 23120170-6.

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https://www.mater-rep.com/EN/10.11896/cldb.23120170 OR https://www.mater-rep.com/EN/Y2025/V39/I9/23120170

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