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首页> 外文期刊>Composites >Combining short flax fiber mats and unidirectional flax yarns for composite applications: Effect of short flax fibers on biaxial mechanical properties and damage behaviour
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Combining short flax fiber mats and unidirectional flax yarns for composite applications: Effect of short flax fibers on biaxial mechanical properties and damage behaviour

机译：将短亚麻纤维毡和单向亚麻纱组合在一起以进行复合应用：短亚麻纤维对双轴力学性能和破坏行为的影响

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摘要

Short flax fibers mats, unidirectional (UD) layers of flax yarns, and an assembly of these two, are used as reinforcements for an epoxy matrix composite. The tensile and flexural properties of the three different composites, in both longitudinal and transverse directions, were studied in order to highlight the effect of mat surface density, using two stacking sequences. A slight decrease of the measured longitudinal properties is observed when low levels of short fibers content are used. This is compensated by a significant decrease of the material variability, a significant increase of the transverse properties, and a favorable effect on the fracture behaviour of the tested specimens. Damage evolution is monitored using acoustic emission (AE) and the use of multivariable analysis of the collected data has given a clear description of the different damage modes, their evolution and their contribution to overall composite failure. Different damage behaviours are observed for the mats and UD samples. Most importantly their combination into a single reinforcement has a positive effect on damage type and evolution. The presence of short fibers in the composite reduces the crack propagation along the fibers/matrix interface, which reduces splitting and transforms the fracture surface from a serrated fracture surface to a flat and confined fracture surface. (C) 2017 Elsevier Ltd. All rights reserved.
机译：亚麻纤维短垫，亚麻纱线的单向（UD）层以及这两者的组合用作环氧基质复合材料的增强材料。研究了三种不同复合材料在纵向和横向上的拉伸和挠曲性能，以强调使用两个堆叠顺序对垫材表面密度的影响。当使用短含量的短纤维时，观察到的纵向性能略有下降。这可以通过材料可变性的显着降低，横向性能的显着提高以及对测试样品的断裂行为的有利影响来弥补。使用声发射（AE）监控损坏的演变，并且对收集到的数据进行多变量分析，清楚地描述了不同的损坏模式，它们的演变以及它们对整体复合材料破坏的贡献。对于垫子和UD样品观察到不同的破坏行为。最重要的是，将它们组合成单个钢筋对损伤类型和演变具有积极影响。复合物中短纤维的存在减少了沿纤维/基体界面的裂纹扩展，从而减少了裂痕，并使断裂面从锯齿状断裂面转变为平坦且狭窄的断裂面。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composites》 |2017年第8期|165-178|共14页
  • 作者

    Habibi Mohamed; Laperriere Luc; Lebrun Gilbert; Toubal Lotfi;

  • 作者单位

    UQTR, LMEM, CP 500, Trois Rivieres, PQ, Canada;

    UQTR, LMEM, CP 500, Trois Rivieres, PQ, Canada;

    UQTR, LMEM, CP 500, Trois Rivieres, PQ, Canada;

    UQTR, LMEM, CP 500, Trois Rivieres, PQ, Canada;

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