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<p>This work concerns the identification of viscolelastic properties of foam materials used as cores of sandwich plates. Based on the frequency response functions (FRF) of a plate subjected to an impulse load, a two-step procedure is proposed that identifies the stiffness properties from the frequencies and the damping properties from the amplitudes. The procedure is first discussed and validated for numerically simulated FRF and subsequently applied to experimental measured FRF. The experimental setup is detailed, and its simplicity is put forward. The procedure is applied in conjunction with a classical sandwich plate model and two viscoelastic models, namely a frequency-independent and a frequency dependent based on a fractional derivative representation. The results of the experimental results are discussed and confirm that the proposed method is a viable alternative to already established but more complex procedures.</p>

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Identification procedure of viscoelastic properties for sandwich structures

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Fat’hi Mohamed,
  • Michele D’Ottavio,
  • Emmanuel Valot,
  • Girolamo Di Cara,
  • Aurelio Araújo

摘要

This work concerns the identification of viscolelastic properties of foam materials used as cores of sandwich plates. Based on the frequency response functions (FRF) of a plate subjected to an impulse load, a two-step procedure is proposed that identifies the stiffness properties from the frequencies and the damping properties from the amplitudes. The procedure is first discussed and validated for numerically simulated FRF and subsequently applied to experimental measured FRF. The experimental setup is detailed, and its simplicity is put forward. The procedure is applied in conjunction with a classical sandwich plate model and two viscoelastic models, namely a frequency-independent and a frequency dependent based on a fractional derivative representation. The results of the experimental results are discussed and confirm that the proposed method is a viable alternative to already established but more complex procedures.