The dynamic characteristics of composites with periodic and random structure

The dynamic characteristics of 2-2 and 1-3 composites with periodic and random structure were systematically and experimentally studied. A parameter, in-phase range of vibration, has been defined to describe the dynamic difference between thickness and lateral modes. This parameter is deeply related to the composite structure and constituent material, and can be used to quantify the difference between different composites. It has been discovered that a random structure consisting of random pitches with either constant or random kerf widths, will be able to significantly suppress the undesired lateral resonances. The performance of transducers built by using composites with different periodic and random structure is well correlated with the dynamic behavior of the composite. A random structure will be able to suppress the lateral modes in composite, hence, improving the transducer performance