【标题】Micromechanical models for predicting the mechanical properties of 3D-printed wood/PLA composite materials: A comparison with experimental data
【参考中译】预测3D打印木材/聚乳酸复合材料力学性能的细观力学模型：与实验数据的比较
【类型】 期刊
【关键词】 3D printing; Wood; Micromechanics; Composite material; Mechanical behavior
【参考中译】 3D打印；木材；细观力学；复合材料；力学行为
【作者】 Ismail Ezzaraa; Nadir Ayrilmis; Manja Kitek Kuzman; Soufiane Belhouideg; Jamaa Bengourram
【摘要】 Analytic modeling of 3D printed natural fiber-reinforced composites is still in its infancy. The existing analytic works on the mechanical properties of these materials seem to be relatively few in spite of their practical interest. However, the mechanical properties are one of the most important parameters that define the structural behavior of the material. A micromechanical approach is used in the present study, to predict the elastic properties of 3D printed wood/PLA composites (WPC). The results of the micromechanical models were validated using the experimental data. The comparison revealed a good correlation with the Mori-Tanaka model, which the maximum deviations were lower than 20%. Moreover, a parametric study showed that the elastic properties of the composites depended strongly on the fiber content, the fiber shape, and the porosity rate.
【参考中译】 3D打印天然纤维增强复合材料的解析建模仍处于初级阶段。现有的关于这些材料的力学性能的分析工作似乎相对较少，尽管它们具有实用价值。然而，力学性能是定义材料结构行为的最重要的参数之一。采用细观力学方法对3D打印木材/聚乳酸复合材料(WPC)的弹性性能进行了预测。利用实验数据对细观力学模型的结果进行了验证。与Mori-Tanaka模型的比较表明，该模型具有较好的相关性，最大偏差小于20%。此外，参数研究表明，复合材料的弹性性能强烈依赖于纤维含量、纤维形状和孔隙率。
【来源】 Mechanics of Advanced Materials and Structures 2022, vol.29, no.27
【入库时间】 2023/5/30
【标题】Research on Electromagnetic Shielding Effectiveness of Multi-layered LZ91/Al Alloy Composite Materials by Asynchronous Accumulative Roll Bonding
【参考中译】多层LZ91/铝合金异步累积滚压复合材料电磁屏蔽效能研究
【关键词】 Asynchronous accumulative roll bonding; LZ91 alloy; Multi-layered LZ91/Al alloy composite materials; Electromagnetic shielding
【参考中译】 异步叠轧；LZ91合金；多层LZ91/铝合金复合材料；电磁屏蔽
【作者】 Tongying ZHANG; Hao HU; Junli WANG; Zhongxue FEN; Jiewen GUO; Xueliang LIU
【摘要】 In this paper, the multi-layered LZ91/Al alloy composite materials were prepared by asynchronous accumulative roll bonding (AARB), and the effect of the multilayer structure on the electromagnetic shielding effectiveness of the alloy was investigated. The result show that the number of LZ91 and Al layers increase exponentially with the increase of AARB passes, and the LZ91 layer and Al layer, α-Mg phase and β-Li phase in the alloy are arranged alternately. Besides, as the aggregate thickness of the Al layer increases in the AARB process, the electrical conductivity of the alloy also increases. Thish can effectively improve the electromagnetic shielding effectiveness of the alloy.
【参考中译】 采用异步累积滚压(AARB)技术制备了LZ91/铝合金多层复合材料，研究了多层结构对LZ91/Al合金电磁屏蔽效能的影响。结果表明，随着AARB道次的增加，合金中LZ91层和Al层的数量呈指数增加，LZ91层和Al层、α-Mg相和β-Li相交替排列。此外，随着AARB过程中Al层聚集体厚度的增加，合金的电导率也随之增加。这可以有效地提高合金的电磁屏蔽效果。
【来源】 Materials Science 2022, vol.28, no.4
【标题】Applying Circular Economy to Construction Industry through Use of Waste Materials: A Review of Supplementary Cementitious Materials, Plastics, and Ceramics
【参考中译】利用废旧材料实现建筑行业循环经济--兼论胶凝材料、塑料、陶瓷辅料
【关键词】 Construction materials; Supplementary cementitious materials; Recycled plastic; Construction and demolition; Waste materials; Circular economy
【参考中译】 建筑材料；辅助胶凝材料；再生塑料；拆建；废旧材料；循环经济
【作者】 Nodehi Mehrab; Taghvaee Vahid Mohammad
【摘要】 Due to constant growth of waste production, recent strategies in waste management such as circular economy promote the maximum life cycle use of materials. In construction industry where structures tend to last for decades, the use of such recycled materials can have numerous benefits including overall reduction in cost, in use of virgin materials, and in CO2 production as well as providing an opportunity for a tailored concrete with specific properties. Yet, because of the stereotypical and negative image of mechanical properties reduction, as a result of using waste materials, often their vast contribution in sustainability and durability properties are not taken into consideration. In this regard, we propose viewing waste materials as secondary raw materials that in certain regards, can provide a favorably tailored property. In this regard, the following review article first provides a short description of the most commonly used waste materials such as supplementary cementitious materials (fly ash, ground granulated blast furnace slag, silica fume, metakaolin, rice husk ash, municipal solid waste ash, steel slag, copper slag), ceramics from construction and demolition (glass powder, brick and tile ceramic and porcelain), and the vastly available plastic materials (polypropylene, polyethylene terephthalate, polyvinyl chloride, and rubber). Then, by reviewing a selected environmental impact (life cycle assessment), physicochemical, durability, and finally mechanical properties discuss the limitations, future projections of newer waste materials (e.g., agricultural waste) to be used and suggest potential future study in this area.
【参考中译】 由于废物产量的不断增长，最近的废物管理战略，如循环经济，促进了材料最大限度地利用生命周期。在结构往往使用几十年的建筑行业中，使用这种回收材料可以带来许多好处，包括总体成本降低、使用原始材料、生产二氧化碳以及提供具有特定性能的定制混凝土的机会。然而，由于机械性能降低的刻板印象和负面印象，由于使用废物材料，它们在可持续性和耐久性性能方面的巨大贡献往往没有得到考虑。在这方面，我们建议将废物视为次要原材料，在某些方面可以提供有利的定制属性。在这方面，下面的综述文章首先简要介绍了最常用的废物材料，如辅助胶凝材料(飞灰、磨细高炉渣、硅灰、偏高岭土、稻壳灰、城市固体废物灰、钢渣、铜渣)、建筑和拆卸用陶瓷(玻璃粉、砖和瓷砖)以及大量可用的塑料材料(聚丙烯、聚对苯二甲酸乙二酯、聚氯乙烯和橡胶)。然后，通过审查选定的环境影响(生命周期评估)、物理化学、耐久性，最后是机械性能，讨论限制，对将使用的较新废物(例如，农业废物)的未来预测，并建议这一领域的潜在未来研究。
【来源】 Circular Economy and Sustainability 2022, vol.2, no.3