Abstract
In this study, a fiber push-out device based on a piezoelectric actuator was designed, analyzed and tested, and its experimental environment was designed. The piezoelectric actuator includes a flexible beam. By using response surface analysis (RSM), taking the large displacement as the objective function and on the premise of meeting the strength requirements, the structural parameters of the flexible beam were analyzed. In the process of fiber push-out, the interfacial shear stress was estimated by establishing the system integrating the fiber-matrix-composite three-phase model and the piezoelectric actuator model using the analytic method, and the theoretical analysis results of the fiber interface mechanical properties were given. A prototype of the system was made, and the performance tests of the piezoelectric actuator and the fiber push-out device were carried out. The test results showed that the designed piezoelectric actuator can achieve a stepping resolution of 6.67 μm and a maximum displacement of about 100 μm at the input voltage of 150 V, which is consistent with the design results. The extrusion test of a single fiber was carried out using a piezoelectric actuator. The mechanical properties of the interfacial layer during the push-out process were measured and the interfacial shear strength was calculated, which is consistent with the theoretical analysis results. Finally, based on the mechanical properties obtained from the test, the loading failure process of the fiber was simulated by finite element analysis, which well explained the failure process of the fiber, thus verifying the feasibility of the designed fiber push-out device.
Highlights
Fiber material has the advantages of a high specific strength, a high specific stiffness and a high specific modulus, which can be used in the production of blades, casing and other aerospace components for its capacity of effectively reducing the weight of the aeroengine and improving the working efficiency of the aircraft [1]
A fiber push-out device based on piezoelectric actuators is designed, analyzed and tested
The designed fiber push-out device needs to push out fibers with a diameter of only 100 μm, and the average thickness of fiber glass is only 300 μm
Summary
Fiber material has the advantages of a high specific strength, a high specific stiffness and a high specific modulus, which can be used in the production of blades, casing and other aerospace components for its capacity of effectively reducing the weight of the aeroengine and improving the working efficiency of the aircraft [1]. Some fiber materials are used in the field of energy harvest and human health monitoring. Mokhtari et al [2,3,4] The interface layer between fiber and matrix is formed in the process of material preparation, and its bonding properties often directly affect the overall mechanical properties of composites. The fiber push-out test, as a method for in-situ test of real materials with a need to prepare special specimens, can conveniently detect the change of interface properties through a load displacement curve. This method is favored by the majority of Micromachines 2021, 12, 1420.
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