Mr. Wiroj Nantasetphong Profile

Wiroj Nantasetphong

Graduate Student Researcher at Univ of California San Diego

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Proceedings Article | 3 April 2013 Paper

Modifying the acoustic impedance of polyurea-based composites

Wiroj Nantasetphong, Alireza Amirkhizi, Zhanzhan Jia, Sia Nemat-Nasser

Proceedings Volume 8689, 86891B (2013) https://doi.org/10.1117/12.2009956

KEYWORDS: Composites, Acoustics, Particles, Transducers, Spherical lenses, Resistance, Corrosion, Ultrasonics, Humidity, Attenuators

Read Abstract +

Acoustic impedance is a material property that depends on mass density and acoustic wave speed. An impedance mismatch between two media leads to the partial reflection of an acoustic wave sent from one medium to another. Active sonar is one example of a useful application of this phenomenon, where reflected and scattered acoustic waves enable the detection of objects. If the impedance of an object is matched to that of the surrounding medium, however, the object may be hidden from observation (at least directly) by sonar. In this study, polyurea composites are developed to facilitate such impedance matching. Polyurea is used due to its excellent blast-mitigating properties, easy casting, corrosion protection, abrasion resistance, and various uses in current military technology. Since pure polyurea has impedance higher than that of water (the current medium of interest), low mass density phenolic microballoon particles are added to create composite materials with reduced effective impedances. The volume fraction of particles is varied to study the effect of filler quantity on the acoustic impedance of the resulting composite. The composites are experimentally characterized via ultrasonic measurements. Computational models based on the method of dilute-randomly-distributed inclusions are developed and compared with the experimental results. These experiments and models will facilitate the design of new elastomeric composites with desirable acoustic impedances.

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