Structural Health Monitoring of Thin Shell Structures

IF 3.4 Q1 ENGINEERING, MECHANICAL
Ihtisham Khalid, Zahid Ahmed Qureshi, Faisal Siddiqui, Selda Oterkus, Erkan Oterkus
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Abstract

Thin plate and shell structures are extensively used in aerospace, naval, and energy sectors due to their lightweight and efficient load-bearing properties. Structural Health Monitoring (SHM) implementations are becoming increasingly important in these industries to reduce maintenance costs, improve reliability, and ensure safe operations. This study presents an efficient triangular inverse shell element for thin shell structures, developed using discrete Kirchhoff assumptions within the inverse finite element method (iFEM) framework. The proposed inverse formulation is efficient and requires fewer strain sensors to achieve accurate and reliable displacement field reconstruction than existing inverse elements based on the First Order Shear Deformation Theory (FSDT). These features are critical to iFEM-based SHM strategies for improving real-time efficiency while reducing project costs. The inverse element is rigorously validated using benchmark problems under in-plane, out-of-plane, and general loading conditions. Also, its performance is compared to an existing competitive inverse shell element based on FSDT. The inverse formulation is further evaluated for robust shape-sensing capability, considering a real-world structural configuration under a practicable sparse sensor arrangement. Additional investigation includes defect characterization and structural health assessment using damage index criteria. This research contributes toward developing more reliable and cost-effective monitoring solutions by highlighting the potential application of the proposed inverse element for SHM frameworks designed for thin shell structures.

Abstract Image

薄壳结构健康监测
薄板壳结构由于其轻便、高效的承载性能,广泛应用于航空航天、海军和能源领域。结构健康监测(SHM)的实施在这些行业中变得越来越重要,以降低维护成本,提高可靠性,并确保安全运行。本研究提出了薄壳结构的有效三角形反壳单元,在反有限元法(iFEM)框架内使用离散Kirchhoff假设开发。与现有的基于一阶剪切变形理论(FSDT)的逆单元相比,所提出的逆单元效率高,需要较少的应变传感器即可实现准确可靠的位移场重建。这些特性对于基于ifem的SHM策略至关重要,可以提高实时效率,同时降低项目成本。在平面内、平面外和一般加载条件下,通过基准问题对逆单元进行了严格验证。并将其性能与现有的基于FSDT的竞争性逆壳单元进行了比较。考虑到实际的稀疏传感器布置下的结构配置,进一步评估了逆公式的鲁棒形状感知能力。额外的研究包括缺陷表征和使用损伤指数标准的结构健康评估。本研究通过强调所提出的逆单元在设计用于薄壳结构的SHM框架中的潜在应用,有助于开发更可靠和更具成本效益的监测解决方案。
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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CiteScore
3.50
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