Study on the Viscoelasticity Measurement of Materials Based on Surface Reflected Waves

Abstract

The reflected waves received from ultrasonic waves propagating in materials contain information that constitutes the physical properties, material composition, defects, and degradation states. When measuring the dynamic viscoelasticity, the traditional bottom reflection method (BRM) cannot be used to measure the bottom irregular samples. In this paper, the storage modulus, loss modulus, and loss tangent are extracted by the surface reflection method (SRM) to evaluate the elastomer sample viscoelasticity. A theoretical study on the phase change caused by multiple reflections in the case of non-thin layer coupling is conducted. Based on this research, the experimental system is built. The results show that considering the thickness of the coupling layer can optimize the determination of viscoelasticity and reduce the error of the viscoelastic evaluation results of an elastomer with the traditional BRM. Finally, based on the principle of the SRM, the density of the elastomers is measured, and the feasibility and overall efficiency of this method are verified by experiments.

Comparative Study on Viscoelastic Evaluation Methods of Polymer Materials Based on Ultrasonic Method

“…Previously, in the study of the evaluation of the viscoelasticity of rubber materials by ultrasonic waves, the consistency of the viscoelasticity evaluation results of the same material by the ultrasonic bottom reflection method and the traditional DMA method has been proved by experiments and simulations, the BRM measured loss tangent (0.0478) are within 3.4% of results by DMA (0.0462) that were measured in [19], it also proves that the surface reflection method is feasible. However, the research on the attenuation coefficient in the bottom reflection method process is not deep enough, and the surface reflection method and the bottom reflection method are not studied in the frequency domain [19,20,21,22]. Based on the above, this paper uses practical rubber materials, the ultrasonic detection system performs spectral analysis on the obtained output signal, the characteristics of the rubber materials are evaluated by analyzing the relationship between the attenuation coefficient, the storage modulus, the loss modulus, the loss tangent and the frequency.…”

Viscoelasticity in Large Deformation Analysis of Hyperelastic Structures

“…More information about the nonlinear dynamics of hyperelastic structures can be found in the recent review article [ 30 ]. Additionally, many studies have been carried out on analyzing viscoelastic structures [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. Li et al [ 46 ] presented a perturbation approach for the lateral vibration analysis of viscoelastic microstructures.…”

Evaluation of the vibration characteristics and handle vibration damping of diesel-fueled 15-HP single-axle tractor

“…The larger the phase angle, the more effective a material is at damping out vibration. 19 Viscoelastic materials can also be used for vibration reduction in the handle grip of walking tractors. Ragni et al 20 applied rubber sleeves to the handles of an Italian-produced single-axle tractor and found that the handle vibration was decreased by 35%.…”