Laser Joining of Continuous Glass Fiber Composite Preforms
Laser Joining of Continuous Glass Fiber Composite Preforms
复制标题
连续玻璃纤维复合材料预制件的激光接合
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Y. Yao
中科院分区：
文献类型：
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作者：
Huade Tan;Y. Yao
研究了激光熔接方法，用于对厚复合材料结构的真空灌注制造中使用的纤维预制件进行厚度强化。激光连接无需填充材料即可实现，以取代传统复合材料制造中使用的粘合剂、销钉或缝线。开发了两步连接工艺来熔合单束内和多个纤维束之间的纤维。有限元分析用于研究接头形态方面的接头强度。发现接头强度是接头界面处纤维接触角和堆积密度的函数。拉伸测试表明，激光连接的纤维束比同类紧固方法具有更高的强度。从纤维束轴向连接中吸取的经验教训适用于 3D 预制件结构的径向和厚度方向上的连接。在轴向方向观察到的流动引起的接头形态和致密化效应表明需要在厚度方向上进行两步连接过程。纤维压实对轴向接头强度的影响激发了厚度方向接头界面处高纤维填充率的需要。
A laser fusion joining method is investigated for the purpose of through thickness strengthening of fiber pre-forms used in the vacuum infusion fabrication of thick composite structures. Laser joining is achieved without filler materials to replace adhesives, pins or stitches used in conventional composite fabrication. A two step joining process is developed to fuse fibers within a single bundle and between multiple fiber bundles. Finite element analysis is used to investigate the joint strength with respect to joint morphology. Joint strength is found to be a function of the fiber contact angle and packing density at the joint interface. Tensile tests show that laser joined fiber bundles exhibit higher strength than comparable fastening methods. Lessons learned from the axial joining of fiber bundles are applied to joining in the radial and thickness directions of 3d pre-form architectures. Flow induced joint morphology and densification effects observed in the axial direction indicate the need for a two step joining process in the thickness direction. Fiber compaction effects on joint strength in the axial direction motivate the need for high fiber packing fraction at joint interfaces in the thickness direction.