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<p>The current study provides a comprehensive scientific understanding of the bending deflection behaviour of a damaged sandwich structure, using both numerical and experimental techniques. The analysis includes delamination-type damage in between the face sheet layers of glass fibre-reinforced polymer (GFRP). Since the sandwich is composed of a GFRP-Epoxy core-GFRP, the numerical analysis was conducted using a commercial finite element analysis (FEA) tool to evaluate the maximum central deflection under a static transverse load applied perpendicularly to the face sheet plane. The numerical central deflection responses are further verified by comparing them with data available in the public domain and with in-house static bending experimentation under different loads. In the present research, the efficacy of mesh size for evaluating deflection response is assessed via a convergence test. Additionally, this research includes a statistical sensitivity analysis (variance-based) developed using surrogate model to assess the influence of various factors on the deflection responses of damaged sandwich structures. Further, the verified numerical model is used to evaluate the impact of design parameters, including face-sheet orientation, aspect ratio, thickness ratio, and delamination shape and location. Sandwich stress characteristics are analysed numerically along the principal directions.</p>

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Effect of delamination damage and sensitivity behaviour on stress and deformation characteristics of sandwich structure

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Naveen Kumar Akkasali,
  • Ashish Kumar Meher,
  • Gaurav Kumar,
  • Subrata Kumar Panda

摘要

The current study provides a comprehensive scientific understanding of the bending deflection behaviour of a damaged sandwich structure, using both numerical and experimental techniques. The analysis includes delamination-type damage in between the face sheet layers of glass fibre-reinforced polymer (GFRP). Since the sandwich is composed of a GFRP-Epoxy core-GFRP, the numerical analysis was conducted using a commercial finite element analysis (FEA) tool to evaluate the maximum central deflection under a static transverse load applied perpendicularly to the face sheet plane. The numerical central deflection responses are further verified by comparing them with data available in the public domain and with in-house static bending experimentation under different loads. In the present research, the efficacy of mesh size for evaluating deflection response is assessed via a convergence test. Additionally, this research includes a statistical sensitivity analysis (variance-based) developed using surrogate model to assess the influence of various factors on the deflection responses of damaged sandwich structures. Further, the verified numerical model is used to evaluate the impact of design parameters, including face-sheet orientation, aspect ratio, thickness ratio, and delamination shape and location. Sandwich stress characteristics are analysed numerically along the principal directions.