Deformation processes of polymer composites with stress concentrators under different reinforcement schemes

IF 2.3 3区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Journal of Reinforced Plastics and Composites Pub Date : 2024-09-14 DOI:10.1177/07316844241281780

Elena Strungar, Dmitrii Lobanov, Artur Mugatarov, Ekaterina Chebotareva

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Abstract

This paper is dedicated to an experimental investigation of an effect of a stress concentrator orientation on a mechanical behavior of polymer composites with various reinforcement schemes. Composite specimens have been made of layered carbon fiber reinforced polymer (CFRP) with lay-up patterns of [±45]16 and [0/90]16. The stress concentrators have been cut in a form of a rectangle (with rounded corners) orientated at angles of 0°, 45°, and 90° to a loading axis. The novel data about the composite’s mechanical behavior has been obtained by the digital image correlation (DIC) method, the acoustic emission (AE) method and the optical microscopy. Quasistatic tests have been carried out taking into account recommendations of the ASTM D5766, ASTM D3039, ASTM D3518. The effect of the stress concentrator orientation on the composite’s strength has been evaluated. It has been found that the stress concentrator does not affect the strength of the composite with the [±45]16 lay-up pattern. This peculiarity has been explained by the absence of the layers preventing the fibers system turning in the direction of the load application. The DIC method has allowed to study the evolution of inhomogeneous strain fields on the specimens’ surfaces. Computational simulations have been carried out within the elasticity stage. The results have shown that the strain fields obtained by both the DIC method and the numerical simulation were similar for the composites with the [0/90]16 reinforcement pattern. However, significant differences have been found for the [±45]16 reinforcement pattern, which have been explained by the development of inelastic zones near the stress concentrator even if the elastic stage is realized at the macrolevel. The using of the AE method and the optical microscopy has allowed to reveal typical mechanisms of the structural damage and to study their occurrence during the tests. It has been concluded that the orientation of the stress concentrator significantly influences the deformation processes of the CFRP with various reinforcement patterns.

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不同加固方案下带有应力集中器的聚合物复合材料的变形过程

本文旨在通过实验研究应力集中器取向对各种增强方案的聚合物复合材料机械性能的影响。复合材料试样由层状碳纤维增强聚合物（CFRP）制成，其铺设模式为 [±45]16 和 [0/90]16。应力集中器被切割成与加载轴成 0°、45° 和 90°角的矩形（带圆角）。通过数字图像相关（DIC）法、声发射（AE）法和光学显微镜获得了有关复合材料机械行为的新数据。根据 ASTM D5766、ASTM D3039 和 ASTM D3518 的建议进行了准静态测试。评估了应力集中器方向对复合材料强度的影响。结果发现，应力集中器不会影响[±45]16铺层模式下复合材料的强度。这种特殊性的原因是没有阻止纤维系统在施加载荷的方向上转动的层。利用 DIC 方法可以研究试样表面不均匀应变场的演变。在弹性阶段进行了计算模拟。结果表明，对于[0/90]16 增强模式的复合材料，DIC 方法和数值模拟获得的应变场相似。然而，[±45]16 增强模式的复合材料却存在明显差异，这是因为即使在宏观层面上实现了弹性阶段，在应力集中器附近也会形成非弹性区。使用 AE 方法和光学显微镜可以揭示结构损伤的典型机制，并研究其在试验过程中的发生情况。研究得出的结论是，应力集中器的方向会显著影响具有各种增强模式的 CFRP 的变形过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Reinforced Plastics and Composites 工程技术-材料科学：复合

CiteScore

5.40

自引率

6.50%

发文量

审稿时长

1.3 months

期刊介绍： The Journal of Reinforced Plastics and Composites is a fully peer-reviewed international journal that publishes original research and review articles on a broad range of today''s reinforced plastics and composites including areas in: Constituent materials: matrix materials, reinforcements and coatings. Properties and performance: The results of testing, predictive models, and in-service evaluation of a wide range of materials are published, providing the reader with extensive properties data for reference. Analysis and design: Frequency reports on these subjects inform the reader of analytical techniques, design processes and the many design options available in materials composition. Processing and fabrication: There is increased interest among materials engineers in cost-effective processing. Applications: Reports on new materials R&D are often related to the service requirements of specific application areas, such as automotive, marine, construction and aviation. Reports on special topics are regularly included such as recycling, environmental effects, novel materials, computer-aided design, predictive modelling, and "smart" composite materials. "The articles in the Journal of Reinforced Plastics and Products are must reading for engineers in industry and for researchers working on leading edge problems" Professor Emeritus Stephen W Tsai National Sun Yat-sen University, Taiwan This journal is a member of the Committee on Publication Ethics (COPE).