A12-c5 - A Measurement Setup for the Determination of Temperature-Dependent Viscoelastic Material Parameters Using an Ultrasonic Pulse-Echo Technique
- Event
- 2025 ICU PADERBORN - 9th International Congress on Ultrasonics
2025-09-21 - 2025-09-25
Paderborn - Band
- Lectures
- Chapter
- A12-c - Surface Acoustic Waves and Guided Waves
- Author(s)
- D. Dreiling, B. Henning - Paderborn University, Paderborn (Germany), D. Itner, C. Birk - University of Duisburg-Essen, Essen (Germany), H. Gravenkamp - Otto von Guericke University Magdeburg, Magdeburg (Germany)
- Pages
- 102 - 105
- DOI
- 10.5162/Ultrasonic2025/A12-c5
- ISBN
- 978-3-910600-08-9
- Price
- free
Abstract
Ultrasonic methods facilitate a non-destructive characterisation of mechanical properties, such as Young’s modulus or shear modulus, based on the propagation time and attenuation of ultrasonic signals. This contribution presents an ultrasonic measurement setup for determining temperature-dependent viscoelastic material parameters of polymers within a frequency range of 0.75 MHz to 2.5 MHz. The system is based on a pulse-echo technique and features a temperature-controlled specimen chamber that enables precise and reproducible heating of hollow cylindrical specimens. To span the frequency range, a broadband ultrasonic transducer and a burst signal with a variable centre frequency are used for transmission. By systematically varying the temperature while measuring ultrasonic time-of-flight and attenuation, elastic and viscous properties can be identified across a temperature range of 20 °C to 55 °C. Initial values are estimated from the measured signals, and the resulting viscous material parameters are determined using an inverse approach. The proposed method thus offers a time-efficient, non-invasive approach for characterising thermally sensitive, frequency-dependent material parameters.