Background

This paper is Part 2 of a study on the scope of the ultrasonic Surface Reflection Method (SRM). Part 1 deals with the theoretical conditions for a satisfactory usage of this method.

Objective

This second part validates the practical feasibility and reliability of the SRM method by comparison with the conventional Transmission Method (TM) in cases where the latter is applicable.

Methods

Two experimental devices (one for SRM and one for TM) are developed and measurements of shear and bulk moduli are carried out at ultrasonic frequency (610 kHz) and at room temperature.

Results

The experimental conditions in terms of sample geometry, pulse characteristics and interfacial transmission required to obtain a given accuracy on the measurement are stated. The SRM is then validated against other experimental methods and is used to determine the shear modulus of a carbon black filled neoprene at ambient temperature (T = 21 °C) and ultrasonic frequency.

Conclusions

The benefit brought by this method is well demonstrated: a unique measurement allows the determination of all the moduli of a highly damping isotropic material (carbon black filled neoprene) not achievable by other methods.

中文翻译：

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超声表面反射法对各向同性材料的机械表征的潜在范围。第2部分。实验结果

背景

本文是超声表面反射法（SRM）研究范围的第二部分。第1部分介绍了令人满意地使用此方法的理论条件。

客观的

第二部分通过在适用常规传输方法（TM）的情况下与传统传输方法（TM）进行比较，验证了SRM方法的实际可行性和可靠性。

方法

开发了两种实验设备（一种用于SRM，一种用于TM），并在超声频率（610 kHz）和室温下测量剪切模量和体积模量。

结果

给出了在给定的测量精度上所需的样品几何形状，脉冲特性和界面传输方面的实验条件。然后，将SRM与其他实验方法进行对比，并用于确定在环境温度（T = 21°C）和超声频率下填充炭黑的氯丁橡胶的剪切模量。

结论

这种方法带来的好处已得到充分证明：独特的测量方法可以确定其他方法无法实现的高阻尼各向同性材料（填充炭黑的氯丁橡胶）的所有模量。