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Modeling and Interpretation of Fiber Orientation-Based Failure Mechanisms in Machining of Carbon Fiber-Reinforced Composites

机译：基于纤维取向的碳纤维增强复合材料加工失效机理的建模与解释

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摘要

Fiber-reinforced polymer composites have recently emerged as novel materials capable of playing a unique role in industrial applications. The advantage of these materials over traditional metals or polymers comes from the material property enhancements that can be achieved by combining appropriate fiber and matrix materials into the microstructure. While these materials have recently become popularized, many complications arise in the manufacturing process of the two-phase microstructures, specifically in the machining of FRP composites. Due to the complex nature of FRP two-phase microstructures, the fiber failure mechanisms occurring in the machining process are not fully understood. Many experimental and modeling techniques have been implemented to more fully explain the nature of the fiber failure mechanisms in the machining process, but these have fallen short of a complete understanding of the machining complexities. This research seeks to gain a fundamental understanding of the fiber orientation-based fiber failure mechanisms occurring in the micro-machining of FRP composites by employing two unique modeling techniques.In this research, both experimental and finite element-based modeling approaches are undertaken. Fibers oriented in 0, 45, 90, and 135 degrees with respect to the direction of tool motion are investigated and unique failure theories are developed for each of these orientations. The model based on experimental observations is focused on explaining the micro-scale failure mechanisms occurring in the machining process. The finite element machining model developed in this work uses a unique modeling approach, which is capable of explaining the fiber failure mechanisms occurring throughout the chip formation process. After development of the two machining models, the machining responses are compared to a set of machining experiments for validation purposes.iiFibers orientated in the 45 and 90 degree orientations were found to fail in compressive crushing-dominated failure while fibers oriented in the 135 degree orientation were found to fail in bending below the surface of the cut. In the 0 degree orientation, the fibers were proposed to fail in buckling or bending-dominated failure, depending on the depth of cut, and tool geometry of the process. The micro-scale fiber failure mechanisms were observed to differ significantly from their macro-scale counterparts. The machining responses of the two models were found to agree well with the experimental validation analyses indicating that these models are an accurate representation of the chip formation process.
机译：纤维增强的聚合物复合材料近来已经成为能够在工业应用中发挥独特作用的新型材料。这些材料相对于传统金属或聚合物的优势来自材料性能的提高，可以通过将适当的纤维和基体材料结合到微结构中来实现。尽管这些材料最近已经普及，但是在两相微结构的制造过程中，特别是在FRP复合材料的机械加工中，出现了许多复杂情况。由于玻璃钢两相微结构的复杂性，在加工过程中发生的纤维破坏机理还没有被完全理解。已经实施了许多实验和建模技术，以更充分地解释加工过程中纤维破坏机理的性质，但是这些对完整的加工复杂性缺乏全面了解。本研究试图通过使用两种独特的建模技术来对FRP复合材料微加工中基于纤维取向的纤维破坏机理进行基本的了解。本研究采用了基于实验和有限元的建模方法。相对于工具运动方向以0度，45度，90度和135度取向的纤维进行了研究，并针对每种取向开发了独特的失效理论。基于实验观察的模型专注于解释加工过程中发生的微观破坏机理。在这项工作中开发的有限元加工模型使用独特的建模方法，该方法能够解释整个切屑形成过程中发生的纤维破坏机理。在开发了两种加工模型后，将加工响应与一组加工实验进行了比较以进行验证。ii发现以45度和90度方向取向的纤维在压缩破碎主导的失效中失败，而以135度取向的纤维失效。被发现在切口表面以下弯曲失败。在0度取向下，根据切割的深度和工艺的工具几何形状，建议纤维在屈曲或弯曲为主的失效中失败。观察到微观尺度的纤维破坏机制与宏观尺度的对应机制显着不同。发现这两个模型的加工响应与实验验证分析非常吻合，表明这些模型是切屑形成过程的准确表示。

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    Calzada Kevin A.;

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  • 年度 2010
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  • 正文语种 {"code":"en","name":"English","id":9}
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