Abstract
The interest of this article lies in the sound radiation of shape memory alloy (SMA) composite laminates. Different from the traditional method of avoiding resonance sound radiation of composite laminates by means of structural parameter design, this paper explores the potential of adjusting the modal peak of the resonant acoustic radiation by using material characteristics of shape memory alloys (SMA), and provides a new idea for avoiding resonance sound radiation of composite laminates. For composite laminates embedded with pre-strained SMA, an innovation of vibration-acoustic modeling of SMA composite laminates considering pre-stain of SMA and thermal expansion force of graphite-epoxy resin is proposed. Based on the classical thin plate theory and Hamilton principle, the structural dynamic governing equation and the frequency equation of the laminates subjected to thermal environment are derived. The vibration sound radiation of composite laminates is calculated with Rayleigh integral. Effects of ambient temperature, pre-strain, SMA volume fraction, substrate ratio, and geometrical parameters on the sound radiation were analyzed. New laws of SMA material and pre-strain characteristics on sound radiation of composite laminates under temperature environment are revealed, which have theoretical and engineering functional significance for vibration and sound radiation control of SMA composite laminates.
Highlights
Composite laminates as structural components have been extensively implemented in various fields of mechanical engineering such as aeronautics, astronautics, naval architecture, and automotive engineering
The analytical method is deployed to carry out several parametric studies to explore the acoustic response of composite laminates in thermal environments
shape memory alloy (SMA) is embedded in each layer with a volume fraction of 20%; graphite and epoxy are invoked as the substrate for a ratio of 1/9
Summary
Composite laminates as structural components have been extensively implemented in various fields of mechanical engineering such as aeronautics, astronautics, naval architecture, and automotive engineering. Few studies about the acoustic radiation of SMA composite laminates are presented in the thermal and mechanical loads [12,13], active vibration control of structures [14,15,16,17], and the reported researching. A new hotspot, the investigation of acoustic of functionally method to estimate sound power of orthogonal antisymmetric composite laminates embedded comprehensively considers the effects of materials, structures, external excitations, and thewith. The sound radiation results laminates was examined by varying the pre-strain, SMA volume fraction, substrate ratio, and in the study provide a theoretical basis for vibration and sound radiation control of embedded SMA structural size parameters with temperature. Theoretical basis for vibration and sound radiation control of embedded SMA composite laminates
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