The critical role of size effect on internal damage and mechanical properties of flax fiber reinforced composites

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composites Science and Technology Pub Date : 2024-11-05 DOI:10.1016/j.compscitech.2024.110958
Lulu Lei , Yiqiao Zhao , Zefei Cheng , Jieyu Chen , Sixian Yang , Tao Yu , Jinhong Fan , Yan Li , Jianzhuang Xiao
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Abstract

The effect of the size on the strength of laminated artificial fiber reinforced composites has been extensive discussed during the design of large composites structure. With the trial as the structures in aerospace, civil engineering, automobile industry, the scaling of the properties of plant fiber reinforced composite should be studied. In this paper, the size effect and failure mechanism of tensile and impact properties of flax fiber reinforced composites were valuated. The effects of different area, thickness and volume on the tensile properties of composites were explored. Additionally, the failure mechanism of size effect on tensile specimens was proposed through the damage morphologies of composites. It is found that the twist of fiber bundle plays an important role in the size effect of composite thickness. Besides, the relationship between impact properties and size effect of composites was conducted, including the size of hammer, different impact energy and sample size. The curves of different types of impact samples were normalized to verify the linear rule in response stage. The crack length after impact was measured and the size effect of crack length was discussed. The size effect of crack area was studied by calculating the crack area with ultrasonic C-scan. Different “size effects” between flax fibers and artificial fibers were explored. The results are expected to provide a theoretical basis for the structural design of plant fiber reinforced composites.

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尺寸效应对亚麻纤维增强复合材料内部损伤和机械性能的关键作用
在大型复合材料结构设计过程中,尺寸对层状人工纤维增强复合材料强度的影响已被广泛讨论。随着航空航天、土木工程、汽车工业等领域结构的试制,植物纤维增强复合材料的性能缩放问题亟待研究。本文对亚麻纤维增强复合材料拉伸和冲击性能的尺寸效应和失效机理进行了评估。探讨了不同面积、厚度和体积对复合材料拉伸性能的影响。此外,还通过复合材料的损伤形态,提出了尺寸效应对拉伸试样的破坏机理。研究发现,纤维束的捻度在复合材料厚度的尺寸效应中起着重要作用。此外,还研究了复合材料冲击性能与尺寸效应之间的关系,包括冲击锤尺寸、不同冲击能量和试样尺寸。对不同类型冲击样品的曲线进行归一化处理,以验证响应阶段的线性规律。测量了冲击后的裂纹长度,并讨论了裂纹长度的尺寸效应。通过超声波 C 扫描计算裂纹面积,研究了裂纹面积的尺寸效应。探讨了亚麻纤维和人造纤维的不同 "尺寸效应"。研究结果有望为植物纤维增强复合材料的结构设计提供理论依据。
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来源期刊
Composites Science and Technology
Composites Science and Technology 工程技术-材料科学:复合
CiteScore
16.20
自引率
9.90%
发文量
611
审稿时长
33 days
期刊介绍: Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites. Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.
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