Abstract
Composite materials are presented in a wide variety of industrial sectors as an alternative to traditionally used materials. In recent years, a new sector has increasingly used these kinds of materials: the manufacture of musical instruments. Resonances of different elements that make up the geometries of musical instruments are commonly used with the aim of enhancing aspects of the timbre. These are sensitive to the mechanical characteristics of the material, so it is important to guarantee the properties of the composite. To do this, it is not uncommon to use pre-impregnated fibers (prepregs) which allow fine control of final volumetric fractions of the composite. Autoclaving is a high-quality process used to guarantee the desired mechanical properties in a composite, reducing porosity and avoiding delamination, but significantly raising production costs. On the contrary, manufacture without autoclaving increases competitiveness by eliminating the costs associated with autoclave production. In this paper, differences in dynamic behavior are evaluated under free conditions of different Carbon Fiber Reinforced Epoxy (CFRE) prepreg boards, processed by autoclave and out-of-autoclave. The results of the complex module are presented according to the frequency, quantifying the variations in the vibratory behavior of the material due to the change of processing.
Highlights
Interest in characterizing the elastic and damping properties of composites is increasing as more and more industrial sectors use these materials in very different applications
Carbon Fiber Reinforced Epoxy (CFRE), autoclave or vacuum bag-only, on the vibratory characteristics of the composite, considering its this paper aims to evaluate the magnitude of the direct influence of processing by prepreg sound speed, obtained by its modal behavior, as well as in the decay time result of the damping of CFRE, autoclave or vacuum bag-only, on the vibratory characteristics of the composite, considering the laminate
This paper performed a dynamic test to analyze the speed of sound of CFRE prepreg plates processed two performed different processes, autoclave vacuum bag-only
Summary
Interest in characterizing the elastic and damping properties of composites is increasing as more and more industrial sectors use these materials in very different applications. Fiber Reinforced Epoxy (CFRE) [11,33,34], but others include those involving bio-composites [35,36] These studies relate the mechanical characteristics of the composite to the sound behavior of different musical instruments, but do not contemplate the direct influence of the processing on the elastic and musical instruments, but do not contemplate the direct influence of the processing on the elastic and non-elastic behavior of the vibration. CFRE, autoclave or vacuum bag-only, on the vibratory characteristics of the composite, considering its this paper aims to evaluate the magnitude of the direct influence of processing by prepreg sound speed, obtained by its modal behavior, as well as in the decay time result of the damping of CFRE, autoclave or vacuum bag-only, on the vibratory characteristics of the composite, considering the laminate. Its sound speed, obtained by its modal behavior, as well as in the decay time result of the damping of laminate
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