具有石墨烯的连续碳纤维增强环氧树脂复合材料的增材制造增强了超高机械性能的层间键合,Polymer Composites

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具有石墨烯的连续碳纤维增强环氧树脂复合材料的增材制造增强了超高机械性能的层间键合
Polymer Composites ( IF 4.8 ) Pub Date : 2021-12-01 , DOI: 10.1002/pc.26423
Pedram Parandoush ₁ , Xuemu Li _{1,

2} , Baoning Chang ₃ , Christopher M. Sorensen ₄ , Jing Shi ₅ , Yuan Liu ₆ , Dong Lin ₁

Affiliation

具有优异机械性能的连续碳纤维增强聚合物复合材料 (CFRPC) 已成为各种工业应用的高性能工程材料。CFRPC 的增材制造 (AM) 能够以低成本生产具有优异机械性能的定制结构，并获得了极大的普及。在本研究中，提出了一种新的增材制造技术，即激光辅助层压物体制造 (LA-LOM)，用于使用具有连续碳纤维增强材料的预浸料片生产 CFRPC。粘合预浸板的界面特性对于增材制造的 CFRPC 的性能至关重要。我们进一步在预浸料片之间引入石墨烯作为改性剂，以改善 CFRPC 的机械性能。结果表明，低孔隙率（0.38%），高浓度的连续碳纤维（63 wt.%）和改进的界面粘合强度有助于获得优异的机械性能。对于复合结构（[0°]s 纤维排列），其中引入 0.5 mg/ml 石墨烯作为界面改性剂，搭接剪切强度、拉伸强度和拉伸模量分别为 18 MPa、2940 MPa 和 170 GPa , 弯曲强度和模量分别为 1310 MPa 和 140 GPa。拉伸强度和模量优于文献中报道的所有 AM 生产的结构，包括碳纤维复合材料以及金属和金属合金。同时，与没有石墨烯增强的试样相比，观察到搭接剪切强度增加了 25%，弯曲强度增加了 10%，弯曲模量增加了 27%，拉伸强度增加了 7%，模量增加了 6%。

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Additive manufacturing of continuous carbon fiber reinforced epoxy composite with graphene enhanced interlayer bond toward ultra-high mechanical properties

Continuous carbon fiber reinforced polymer composites (CFRPCs) exhibiting superior mechanical properties have emerged as high-performance engineering materials for various industrial applications. Additive manufacturing (AM) of CFRPCs enables production of customized structures with superior mechanical properties at a low cost and has gained tremendous popularity. In the present study, a novel AM technique namely laser-assisted laminated object manufacturing (LA-LOM) is proposed for producing CFRPCs using prepreg sheets with continuous carbon fiber reinforcement. The interfacial properties of the bonded prepreg sheets are critical for the performance of the additively manufactured CFRPCs. We further introduce graphene as a modifier between the prepreg sheets to improve the mechanical properties of the CFRPCs. It is shown that low porosity (0.38%), high concentrations of continuous carbon fibers (63 wt. %), and improved interfacial bonding strength contribute to excellent mechanical properties. For the composite structure ([0°]s fiber arrangements), in which 0.5 mg/ml graphene is introduced as interface modifier, the lap shear strength, tensile strength, and tensile modulus are 18 MPa, 2940 MPa, and 170 GPa, respectively, and the flexural strength and modulus are 1310 MPa and 140 GPa, respectively. The tensile strength and modulus outperform all AM-produced structures reported in literature, including carbon fiber composites and metals and metal alloys. Meanwhile, the increases are observed in the lap shear strength by 25%, flexural strength by 10%, and flexural modulus by 27%, as well as tensile strength by 7% and modulus by 6%, compared to specimens without graphene reinforcement. This composite architecture design, involving laminated continuous carbon fiber reinforced prepreg sheets and graphene-modified interfaces, provides a readily scalable manufacturing method toward excellent properties and this method can be further explored in industrial applications.

更新日期：2021-12-01

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