碳/环氧复合材料的固化程度,微观结构和性能,这些复合材料是通过正面聚合处理处理的
Aurpon Tahsin Shams1, Easir Arafat Papon1, Pravin S Shinde2
1Department of Aerospace Engineering and Mechanics, The University of Alabama, Tuscaloosa, AL 35487, USA.
Polymers
|June 19, 2024
概括
前端聚合 (FP) 为碳/环氧复合材料提供了一个快速的增材制造路线. 然而,高纤维含量和内部缺陷限制了机械性能,需要控制FP方法以提高性能.
科学领域:
- 材料科学与工程 材料科学与工程
- 聚合物化学 聚合物化学
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 正面聚合 (FP) 被探索为热复合材料的快速增材制造 (AM) 技术.
- 研究碳/环氧 (C/Ep) 复合材料,包括整洁环氧,短碳纤维 (SCF) 和连续碳纤维 (CCF) 增强系统.
研究的目的:
- 研究FP用于C/Ep复合材料制造的可行性.
- 分析纤维增强对FP特性和材料性能的影响.
- 评估FP加工的C/Ep复合材料的微结构,热和机械性能.
主要方法:
- 外热反应温度,聚合正面速度和固化的程度的表征.
- 微结构分析,包括空隙含量和裂形成.
- 评估热性质 (玻璃过渡温度) 和拉伸力机械性质.
主要成果:
- 外热反应温度在110-153°C之间,激发温度在150-270°C之间.
- 增加的纤维含量减少了前部速度和增加了固化时间;CCF/Ep复合材料表现出最大FP速度 (0.64 mm/s).
- 与传统方法相比,固化的程度 (70-85%) 低于传统方法,导致高空隙含量 (12%),内部裂和较低的拉伸性能,而与自处理的样品相比.
结论:
- 对于C/Ep复合材料来说,FP是一种快速的AM路线,但当前的加工会导致重大缺陷.
- 高纤维含量会对治疗动力学和正面速度产生负面影响.
- 控制的FP方法对于实现无缺陷的微观结构和增强材料性能至关重要.
更多相关视频
09:41Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes
Published on: May 17, 2018
13.5K
14:24Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
Published on: March 12, 2014
12.4K
相关概念视频
Curing Methods
74
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
74
Polymer Classification: Architecture
2.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.7K
Fiber Reinforced Concrete
75
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
75
Curing of Concrete
93
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
93
Accelerated Curing of Concrete
124
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
124
Polymers
35.7K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
35.7K
