预应力复合材料的多尺度剪切破坏机制

IF 4.8 2区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES
Chenmin Zhao, Bing Wang, Chenglong Guan, Shihan Jiang, Jianfeng Zhong, Shuncong Zhong
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引用次数: 0

摘要

弹性纤维预应力(EFP)技术是为了平衡聚合物复合材料固化过程中产生的热残余应力而开发的,在整个固化过程中,连续纤维在恒定应力或恒定应变下进行预拉伸。只有在树脂完全固化后,才能消除拉力。研究表明,EFP 能够增强复合材料的剪切性能,但其基本力学原理尚不清楚。在此,我们研究了 EFP 在碳复合材料中诱导的多尺度剪切破坏机制。我们开发了一套定制的双轴纤维预应力设备,用于对平纹碳纤维预浸料施加双轴拉力,并采用基于恒定应变的 EFP 方法生产出不同预应变水平的预应力复合材料。随后通过机械测试和微观形态分析确定了 EFP 对宏观剪切破坏的影响。建立了微观和中观尺度的代表性体积元素(RVE)有限元模型,并通过实验进行了验证。然后利用这些模型揭示了 EFP 诱导的潜在应力演变力学。研究发现,EFP 可通过提高纤维/基体界面粘合强度来改善复合材料的剪切性能。这归因于锁定在聚合物复合材料中的预应变纤维的弹性应变恢复,产生压应力以抵消外部负载。随后提出了多尺度剪切破坏机制。这些研究结果有望促进航空航天复合材料的结构设计和 EFP 的应用。揭示了预应变对微结构应力演变力学的影响。提出了预应变复合材料的多尺度剪切破坏机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Multiscale shear failure mechanisms within a prestrained composite

Multiscale shear failure mechanisms within a prestrained composite
The elastic fiber prestressing (EFP) technique has been developed to balance the thermal residual stress generated during curing of a polymeric composite, where continuous fibers were prestretched under either constant stress or constant strain throughout the curing process. The tension was only removed after the resin was fully cured. It has been demonstrated that EFP is able to enhance the shear properties of the composite, while the underlying mechanics is still unknown. Here, we investigated the multiscale shear failure mechanisms induced by the EFP within a carbon composite. A bespoke biaxial fiber prestressing rig was developed to apply biaxial tension to a plain‐weave carbon prepreg, where the constant strain‐based EFP method was employed to produce prestrained composites with different prestrain levels. Effects of EFP on macro‐scale shear failure were subsequently characterized through mechanical tests and micro‐morphological analysis. Both the micro‐ and meso‐scale representative volume element (RVE) finite element models were established and experimentally verified. These were then employed to reveal the underlying stress evolution mechanics induced by EFP. It is found that EFP would improve the shear performance of a composite by enhancing the fiber/matrix interfacial bonding strength. This attributes to the elastic strain recoveries of the prestrained fibers locked within a polymeric composite, which generate compressive stresses to counterbalance the external loading. The multiscale shear failure mechanisms were then proposed. These findings are expected to facilitate structural design and application of the EFP for aerospace composites.Highlights Biaxial tension is applied to produce prestrained woven composite. Prestrain effects on microstructural stress evolution mechanics are revealed. Multiscale shear failure mechanisms are proposed for prestrained composites.
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来源期刊
Polymer Composites
Polymer Composites 工程技术-材料科学:复合
CiteScore
7.50
自引率
32.70%
发文量
673
审稿时长
3.1 months
期刊介绍: Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research, production, processing, and applications. PC brings you the details of developments in this rapidly expanding area of technology long before they are commercial realities.
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