Monitoring stress concentration in polymers with circular notch exploiting graphene-based sensors

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Elli Bellou , Anastasios C. Manikas , Maria Giovanna Pastore Carbone , Stella Peloni , Christos Tsakonas , Costas Galiotis
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引用次数: 0

Abstract

Failure of polymers frequently initiates at discontinuities in the material, such as holes and notches, as they constitute points of increased stress concentration. Herein, we propose the use of monolayer graphene produced via Chemical Vapour Deposition to monitor the stress distribution close to a defect in poly(methyl methacrylate). Combining in-situ Raman spectroscopic mapping with tensile tests, the stress/strain distribution around the defect can be probed via monitoring the wavenumber shift of the spectroscopic features of graphene. The measured stress concentration factor of 2.41 is remarkably close to the value derived from Finite Element Analysis, and agrees with other studies in the literature, thus demonstrating that the proposed technique is reliable, and that graphene can accurately sense stress concentration close to a defect, with a sub-micron spatial resolution and a strain resolution of ≈60 με.

Abstract Image

Abstract Image

利用石墨烯传感器监测带有圆形凹槽的聚合物中的应力集中情况
聚合物的失效经常发生在材料的不连续性处,例如孔洞和缺口,因为它们构成了应力集中的增加点。在此,我们建议使用通过化学气相沉积法生产的单层石墨烯来监测聚甲基丙烯酸甲酯缺陷附近的应力分布。结合原位拉曼光谱绘图和拉伸试验,通过监测石墨烯光谱特征的波长位移,可以探测缺陷周围的应力/应变分布。测得的应力集中因子为 2.41,与有限元分析得出的值非常接近,并且与其他文献中的研究结果一致,从而证明了所提出的技术是可靠的,石墨烯能够以亚微米级的空间分辨率和≈ 60 με的应变分辨率准确感知缺陷附近的应力集中。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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