低温对3D打印短碳纤维增强聚乙复合材料 (CF/PEEK) 机械性能和断裂行为的影响
Mengyang Cui1, Jian Mao2,3
1School of Mechanical and Vehicle Engineering, Shanghai University of Engineering and Technology, 8B624, Traffic Building, No.333 Longteng Road, Songjiang District, Shanghai, 201620, China.
Scientific reports
|October 16, 2025
概括
碳纤维增强聚乙烯 (CF/PEEK) 复合材料在低温环境中具有显著降低的抗拉强度. 性能降低与脆性骨折和在-175°C下纤维矩阵粘附力减弱有关.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 聚合物科学 聚合物科学
背景情况:
- 碳纤维增强聚乙 (CF/PEEK) 复合材料是具有多种应用的先进材料.
- 了解它们在极端条件下的性能,如低温,对于可靠的工程至关重要.
- 沉积建模 (FDM) 是生产这些复合材料的常见增材制造技术.
研究的目的:
- 系统地研究低温环境对FDM打印CF/PEEK复合材料的机械性能和断裂行为的影响.
- 开发一个拉伸强度作为温度的函数的预测模型.
- 阐明控制在冷温度下性能降解的微观结构机制.
主要方法:
- 用FDM打印的CF/PEEK复合材料在各种温度范围内进行机械测试,包括使用液的冷条件.
- 开发和验证一个回归模型,用差异分析来预测拉伸强度.
- 使用扫描电子显微镜 (SEM) 对断裂表面的微结构检查.
主要成果:
- CF/PEEK复合材料的拉伸强度随着温度的下降显著下降,在-175°C下降了84.3%,而在25°C下降了84.3%.
- 弹性模块显示出非单调的趋势,最初下降,然后随着温度的降低而增加.
- 在SEM分析中,发现了从柔性转向脆性断裂模式的转变,以及在低温下碳纤维与PEEK矩阵之间的界面粘接减弱的证据.
结论:
- 低温严重降低了FDM打印CF/PEEK复合材料的拉伸性能.
- 观察到的性能下降归因于脆弱的骨折机制和受损的纤维矩阵粘附.
- 这些发现为CF/PEEK复合材料在低温和低温环境中的应用和设计提供了关键的见解.
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