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Estimating mechanical properties of 2D triaxially braided textile composites based on microstructure properties

机译：基于微观结构特性估算二维三轴编织纺织复合材料的机械性能

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Textile composites manufactured using Resin Transfer Modeling (RTM) can offer advantages in some automotive applications including reduction in weight, while being relatively simpler to fabricate than standard laminated composites used for aerospace applications. However, one of the challenges that arise with these textile composite materials is that the mechanical properties are inherently dependent on the local and final (in-situ) architecture of the textile itself as a result of the molding and curing processes. While this provides additional latitude in the composite design process it also necessitates the development of analytical models that can estimate the mechanical properties of a textile composite based on the textile architecture and the properties of the manufactured component. In this paper, an analytical model is developed and its estimations are compared against experimental in-plane engineering properties for composites with various textile architectures. Results from the model are also compared against finite element (FE) based computational results. The microstructures of the 2D triaxially braided composite (2DTBC) studied were extensively characterized. The microstructure properties thus measured were used in the analytical model to estimate the mechanical properties. Uniaxial tension and V-notched rail shear tests were conducted on 2DTBC with different textile architectures. Good agreement between the analytical, computational, and experimental results were observed and are reported here. Furthermore, computational estimations of matrix mechanical properties are limited to the linear elastic range of a representative material volume (unit cell) and coupon data. Full mechanical response of larger 2DTBC structures, albeit of prime interest, is beyond the scope of this work and could be the focus of follow up studies.
机译：使用树脂传递模型（RTM）制造的纺织复合材料在某些汽车应用中可提供优势，包括减轻重量，同时比用于航空航天应用的标准层压复合材料制造相对简单。但是，这些纺织品复合材料所面临的挑战之一是，由于模制和固化过程，机械性能固有地取决于纺织品本身的局部和最终（原位）结构。尽管这在复合材料设计过程中提供了更多的自由度，但同时也需要开发分析模型，这些模型可以基于纺织品的结构和所制造组件的属性来估计纺织品复合物的机械性能。在本文中，开发了一种分析模型，并将其估计值与具有各种纺织结构的复合材料的实验平面内工程特性进行了比较。还将来自模型的结果与基于有限元（FE）的计算结果进行比较。研究了二维三轴编织复合材料（2DTBC）的微观结构。如此测量的微结构性质被用于分析模型中以估计机械性质。在具有不同纺织结构的2DTBC上进行了单轴拉伸和V形槽口剪切试验。在分析，计算和实验结果之间观察到良好的一致性，并在此处报告。此外，基体力学性能的计算估计仅限于代表性材料体积（单位晶胞）和试样数据的线性弹性范围。较大的2DTBC结构的完全机械响应尽管引起人们的极大关注，但超出了本研究的范围，可能成为后续研究的重点。

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