Inter-Laboratory Characterization of Biot Parameters of Poro-Elastic Materials for Automotive Applications

Polydisperse solid foams: Multiscale modeling and simulations of elasto-acoustic properties including thin membrane effects

“…It is important to note that the extrapolated value at a compression rate equal to zero is very sensitive to the experimental data in the range [0.5% − 1.5%]. Chevillote et al (2020) [64] also observed that this sensitivity of the Young's modulus to the compression rate may result in scattered experimental data. Here, a power law for the extrapolation is chosen, yielding E ≈ 140 [kP a] at zero compression rate.…”

Considerations for mass-spring porous absorber characterization approaches based on finite element modelling

“…In reality, porous liners are applied in vehicles with a lighter elastic layer on top, which corresponds to a loading of 3-6 kg/m 2 . As long as porous liners tend to involve inhomogeneities, certain pre-stressing is recommended to maintain measurement stability [18]. However, depending on stiffness characteristics of foams, samples can express high sensitivity to pre-loading and as a result, material parameter calculations can lead to overestimated stiffness values.…”

“…1. eters of the skeleton. Unfortunately, comparing the optimization values of these parameters with measurement results directly is not possible, as long as measurement data only provides apparent parameter values instead of intrinsic ones [18]. One of the reasons is the effect of the boundary conditions of the sample on it's behavior.…”

“…However, as simple as the concept of the measurement setup might seem, it poses a number of difficulties for precise parameter definitions. Among them are excitation plate-trim boundary condition influences, foam prestressing sensitivity and poor measurement reproducibility [18]. The current paper focuses on the development of a material parameter characterisation algorithm that circumvents the mentioned difficulties.…”