Tensile properties of sandwich-designed carbon fiber filled PLA prepared via multi-material additive layered manufacturing and post-annealing treatment

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-07-01 DOI:10.1515/ipp-2022-4283

Zhaogui Wang, Xiuzeng Yin, Lihan Wang

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引用次数: 0

Abstract

Abstract Polylactic Acid (PLA) experiences widely spread applications in Fused Filament Fabrication (FFF) owing to its relatively high stiffness, strength, and environmentally friendly biodegradability. Reinforcing inclusions like short carbon fibers are introduced to virgin PLA feedstock aiming to improve the mechanical performance of FFF-made products. Nevertheless, the rigid fibers significantly reduce the ductility of the overall fabricated parts. This study prepares sandwich specimens with PLA as core and its 10 wt% chopped carbon fiber reinforced composites (i.e., CF/PLA) as shell via a low-cost FFF-based multi-material additive layered manufacturing method. The sandwich specimen has three layers, which are changed according to different material volumes, which is able to design the local strength and toughness performances of a printed part. Tensile properties of these sandwich samples printed in the different volumetric rates of virgin PLA constituents are measured. It is found that the strength of sandwich specimens with 20% vol of PLA reduces noticeably as compared to the full CF/PLA specimens. The 80% vol specimens exhibit a competitive strength as compared to the 40% and 60% vol specimens, while its toughness increases notably as compared to the other cases. Finite element simulations of the layered manufacturing process show that the thermal residual stresses of 20% vol sandwich accumulates most significantly. We also explore the effects of thermal annealing on the prepared sandwiches. Experimental results indicated that the post-annealing process improved the strength and stiffness of the sandwich specimens, while enhancing the stability of the mechanical properties of the FFF printed sandwich.

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多层材料增材和后退火处理制备的三明治设计碳纤维填充聚乳酸的拉伸性能

摘要聚乳酸（PLA）具有较高的刚度、强度和环境友好的生物降解性，在熔丝制造中得到了广泛的应用。将短碳纤维等增强夹杂物引入PLA原料中，旨在提高FFF产品的机械性能。然而，刚性纤维显著降低了整个制造部件的延展性。本研究通过一种低成本的基于FFF的多材料增材分层制造方法，制备了以PLA为芯、以其10wt%短切碳纤维增强复合材料（即CF/PLA）为壳的三明治试样。夹层试样有三层，根据不同的材料体积进行变化，能够设计印刷零件的局部强度和韧性性能。测量了在原始PLA成分的不同体积率下印刷的这些夹层样品的拉伸性能。研究发现，与全CF/PLA试样相比，含有20%体积PLA的夹层试样的强度显著降低。与40%和60%体积的试样相比，80%体积的试样表现出竞争强度，而与其他情况相比，其韧性显著提高。对分层制造过程的有限元模拟表明，20%体积三明治的热残余应力积累最显著。我们还探讨了热退火对所制备的三明治的影响。实验结果表明，后退火工艺提高了夹层试样的强度和刚度，同时提高了FFF印刷夹层力学性能的稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.