Needle-punched carbon/carbon composites (NP-C/Cs) are advanced materials widely used in aerospace applications. The needle-punching technique improves the integrality of carbon-fibre plies, however, it also introduces many defects, affecting the mechanical behavior of NP-C/Cs. A theoretical model of irregular beams is suggested to investigate the mechanical behavior of unidirectional needle-punched carbon/carbon composites. Stress distributions in punched and squeezed fibres and an effect of the needle-punching technology are assessed.

中文翻译：

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针刺碳/碳复合材料的理论分析

针刺碳/碳复合材料（NP-C / Cs）是广泛用于航空航天应用的高级材料。针刺技术提高了碳纤维帘布的整体性，但是它也引入了许多缺陷，从而影响了NP-C / Cs的机械性能。建议使用不规则梁的理论模型来研究单向针刺碳/碳复合材料的力学行为。评估了冲压和挤压纤维中的应力分布以及针刺技术的效果。