利用声发射技术研究压电片对层合复合材料损伤起裂的影响

IF 2.5 3区 工程技术 Q2 MECHANICS
Neetika Saha, Parikshit Roy, Pijush Topdar
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引用次数: 0

摘要

由于层合复合材料通常具有脆性行为,因此在损伤开始时识别损伤是至关重要的。声发射(AE)技术能够实时识别这种损伤的起始。然而,层合复合材料具有多种复杂的损伤机制。这些基于ae的损伤模式识别是一个复杂的现象,需要在此方向上进行严格的研究,以便将特征信号分配给特定的损伤机制。在这方面,铅笔芯断裂(PLB)作为一种工具,能够模拟层合复合材料的各种损伤机制。此外,复合材料的界面是最弱的区域,但通过实验证明,在该区域应用PLB是不可能的。为了解决这一问题,建立了层压碳纤维增强聚合物复合材料的数值模型,其中在界面处施加PLB,以研究这些最薄弱区域的损伤起裂。然而,利用声发射传感器的全尺寸模型来捕获声发射波,增加了建模的复杂性和计算成本。为此,提出了一种简化的建模方法,建立了压电贴片与复合材料层合板集成的有限元模型。提出了一种利用小波变换的方法,将不同PLB应用角度产生的声发射信号的频率内容与层合复合材料的各种损伤机制模式相关联。该方法可用于在高端计算设备匮乏的情况下识别复合材料的几种损伤模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of damage initiation in laminated composites using piezoelectric patch: an investigation using AE technique

Effect of damage initiation in laminated composites using piezoelectric patch: an investigation using AE technique

Identification of damage at its initiation is crucial for laminated composites due to their usual brittle behavior. Acoustic emission (AE) technique is capable of identifying such an initiation of damage in real time. However, laminated composites undergo several complex damage mechanisms. These AE-based damage mode identification is a complex phenomenon, and rigorous studies are needed in this direction for assigning signature signal to a specific damage mechanism. In this regard, pencil lead break (PLB), as a tool, is capable of simulating various damage mechanisms in laminated composites. Moreover, the interface of laminated composites is the weakest region, but applying PLB in this region is impossible through experimentation. To address this problem, a numerical model of laminated carbon fiber-reinforced polymer composite is modeled where PLB is applied at the interfaces in order to investigate the damage initiation at these weakest zones. However, a full-scale model of AE sensor to capture the AE waves increases the modeling complexity and cost of computation. In this regard, a simplified modeling approach is introduced by developing a finite element model of piezoelectric patch integrated with laminated composite plate. An approach is developed to correlate the frequency contents of AE signals generated by varying the angle of PLB application with various modes of damage mechanisms in laminated composites by performing wavelet transform. The introduced methodology can be used to identify several modes of damages in laminated composites for high-end engineering applications even when there is scarcity of high-end computational facility.

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来源期刊
CiteScore
4.40
自引率
10.70%
发文量
234
审稿时长
4-8 weeks
期刊介绍: Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.
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