纤维取向对大型合成纤维在短期和长期拉伸试验中行为的影响

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Thais S. Rocha, Daniel C. T. Cardoso, Luís A. G. Bitencourt Jr
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引用次数: 0

摘要

合成纤维随着时间的推移而发生变形可能是结构设计中的一个问题,尤其是在使用极限状态下。短期拉拔试验通常用于预测纤维与基体之间的相互作用,但即使在这种情况下,对平行于载荷方向的单根纤维的拉拔行为进行个性化评估可能也不足以预测复合材料的效率。在本研究中,对与载荷方向成 15°、30° 和 45° 角的纤维进行了短期和长期拉拔试验,以研究宏观合成纤维取向对纤维-基质相互作用的影响。在短期试验中,对拉出的纤维进行光学显微镜成像,以便将纤维的表面退化与应力-应变曲线联系起来。在准静态拉拔(短期)中,所有纤维和角度的拉拔强度都有小幅下降,此外,由于这类纤维具有显著的吸附效应,其表面也出现了严重退化。与此相反,在长期试验中,随着纤维倾斜角度的增加,纤维的蠕变减小,这是由于非轴向加载和轴向力偏差产生的附加力分量导致的。布尔格斯流变模型的参数被写成纤维取向角的函数,与实验数据非常吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influence of fiber orientation on the behavior of macro synthetic fiber in short- and long-term pullout tests

Influence of fiber orientation on the behavior of macro synthetic fiber in short- and long-term pullout tests

Synthetic fibers deforming over time can be a concern in structural design, particularly in serviceability limit states. Short-term pullout tests are commonly used to predict fiber–matrix interactions, but even in this case, an individualized evaluation of the pullout behavior of single fibers oriented parallel to the load direction may not be sufficient to predict the efficiency of the composite. In the present work, short- and long-term pullout tests were performed with fibers oriented at angles of 15°, 30°, and 45° to the direction of the load to investigate the influence of macro synthetic fibers orientation on fiber–matrix interactions. In short-term tests, optical microscopy images were obtained on the pulled-out fibers to correlate the surface degradation of the fibers with the stress versus strain curves. In quasi-static pullout (short-term), small reductions in pullout strength were observed for all fibers and angles, in addition to an intensive degradation of their surfaces owing to the significant snubbing effect of this type of fiber. In contrast, for the long-term tests, a creep reduction was observed with increasing fiber inclination angle caused by the creep reduction of the fiber due to non-axial loading and additional force components produced by the deviation of the axial force. The parameters of Burgers rheological model were written as a function of the fiber orientation angle, with excellent adjustment to the experimental data.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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