Composites Part A: Applied Science and Manufacturing ( IF 8.7 ) Pub Date : 2019-11-26 , DOI: 10.1016/j.compositesa.2019.105713 K. Niendorf , B. Raeymaekers
Aligning microfibers along a user-specified direction is important to fabricate polymer-matrix composite materials with tailored properties, including anisotropic electrical and thermal conductivity and high strength-to-weight ratio. Building on our earlier work, we employ ultrasound directed self-assembly to align carbon microfibers along user-specified directions in photopolymer resin and use stereolithography to cure the resin and 3D print composite materials. We quantify macro- and microscale alignment of microfibers in the matrix as a function of weight fraction and dimensionless ultrasound transducer separation distance and input power. Multiple regression analysis expresses microfiber alignment as a function of the fabrication process parameters and shows that microscale alignment is primarily determined by microfiber weight fraction, whereas macroscale alignment is a function of microfiber weight fraction, dimensionless ultrasound transducer separation distance and input power. Relating microfiber alignment to the fabrication process parameters is a crucial step towards 3D-printing polymer-matrix composite materials with tailored material properties.
中文翻译:
量化使用超声定向自组装和3D打印技术制造的聚合物基复合材料中碳微纤维的宏观和微观尺度对准
使微纤维沿用户指定的方向对齐对于制造具有定制特性(包括各向异性的电导率和导热率以及高强度/重量比)的聚合物基复合材料非常重要。在早期工作的基础上,我们采用超声定向自组装技术将碳微纤维沿用户指定的方向在光敏聚合物树脂中对齐,并使用立体光刻技术来固化树脂和3D打印复合材料。我们根据重量分数和无量纲超声换能器的分离距离和输入功率,对基质中微纤维的宏观和微观尺度对准进行了量化。多元回归分析将微纤维的排列表示为制造工艺参数的函数,并表明微尺度的排列主要由微纤维的重量分数决定,而宏观校准是超细纤维重量分数,无量纲超声换能器分离距离和输入功率的函数。将微纤维排列与制造工艺参数相关联,是朝着3D打印具有定制材料特性的聚合物-基体复合材料迈出的关键一步。