Abstract
In this paper, the influence of E-glass fiber volume fraction and laying angle on the damping and strength of composite laminates was comprehensively analyzed. By increasing the fiber laying angle and reducing the glass fiber volume fraction, the damping capacity of the composite laminate was increased, but the tensile strength of the laminate was reduced; By reducing the fiber laying angle and increasing the glass fiber volume fraction, the tensile strength of the composite laminate was increased, but the damping characteristics of the laminate was reduced. In addition, in the damping experiment of composite laminates, in order to avoid the influence of external damping sources, the vacuum non-contact damping test method was adopted in this paper, and the influence of air damping on the damping experiment results of composite laminates was comparatively analyzed. The results of comparative experiments showed that air damping had a very obvious influence on the damping of composite laminates, especially when the damping of composite laminates was small, the influence of air damping would be greater.
Highlights
Damping sources, such as the mass effect of the measuring sensor, air damping, friction, etc., which makes the composite material damping experiment results deviate from the actual damping
In order to improve the accuracy of the damping experiment, a vacuum noncontact damping test equipment was designed in this paper to conduct non-contact damping tests in a vacuum environment and analyze the influence of air damping on the damping test accuracy of composite materials
The test results show that the E-glass fiber volume fraction has an effect on the damping of the composite laminate, and there is a nonlinear relationship between the damping coefficient of the specimen and the E-glass fiber volume fraction
Summary
Damping sources, such as the mass effect of the measuring sensor, air damping, friction, etc., which makes the composite material damping experiment results deviate from the actual damping. Based on the current research status of E-glass fiber/polyurethane composite damping, the influence of the volume fraction of E-glass fiber and the laying angle on the damping and strength of the laminate was comprehensively considered in this paper. In order to improve the accuracy of the damping experiment, a vacuum noncontact damping test equipment was designed in this paper to conduct non-contact damping tests in a vacuum environment and analyze the influence of air damping on the damping test accuracy of composite materials
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