并行3D打印夹层复合材料的弯曲响应
Flexural response of concurrently 3D printed sandwich composite
摘要：
在船舶应用的轻质材料中，复合泡沫芯材夹层结构由于其在面板损伤时泡沫芯材的吸水率较低而具有广阔的应用前景。HDPE（高密度聚乙烯）长丝用于3D打印夹层皮肤，玻璃微球（GMB）增强的HDPE复合泡沫长丝用于芯部。优化的参数用于制备20，40和60体积%的GMB在HDPE中的共混物。这些发泡的共混物以长丝形式挤出，随后用于市售的基于熔丝制造（FFF）的3D打印机。同时3D打印无缺陷的复合泡沫芯夹层复合材料，以表征其弯曲行为。在三点弯曲模式下测试打印的HDPE、泡沫芯和夹层。GMB的加入增加了夹层复合材料的比模量和强度，并且对于具有60体积%GMB的芯的夹层是最高的。泡沫芯夹层的弯曲强度、断裂强度和应变比其各自的芯登记了更优的响应。实验结果与理论预测吻合较好。最后，对印刷夹层结构的失效模式进行了讨论。
英文摘要：
Among many lightweight materials used in marine applications, sandwich structures with syntactic foam core are promising because of lower water uptake in foam core amid face-sheets damage. HDPE (high-density polyethylene) filament is used to 3D print sandwich skin, and glass microballoon (GMB) reinforced HDPE syntactic foam filaments are used for the core. The optimized parameters are used to prepare blends of 20, 40, and 60 volume % of GMB in HDPE. These foamed blends are extruded in filament form to be subsequently used in commercially available fused filament fabrication (FFF) based 3D printers. The defect-free syntactic foam core sandwich composites are 3D printed concurrently for characterizing their flexural behavior. The printed HDPE, foam cores, and sandwiches are tested under three-point bending mode. The addition of GMB increases both specific modulus and strength in sandwich composites and is highest for the sandwich having a core with 60 volume % of GMB. The flexural strength, fracture strength, and strain of foam core sandwiches registered superior response than their respective cores. The experimental results are found in good agreement compared with theoretical predictions. Finally, the failure mode of the printed sandwich is also discussed.
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