Abstract
This paper discusses an in-depth experimental study on the fretting wear behavior of PVDF (polyvinylidene fluoride) piezoelectric thin film against a Si3N4 ceramic sphere under air conditions. A fretting wear device with a ball-on-plate contact configuration was applied. The changes of displacement amplitude, normal force, and applied voltage were taken into account. The friction logs were used to determine the contact state of the PVDF thin film during the fretting test. The 3D topography instrument and scanning electron microscope (SEM) were used to measure the details of the surface morphology and wear volume. The test results of PVDF thin films under different normal force, displacement amplitude, and applied voltage are summarized through the collection and analysis of experimental data. It is shown that the creep and plastic deformation lead to obvious winkles at the contact surface, which may decrease the specific wear rate of PVDF thin films.
Highlights
Piezoelectric materials are one of the most important intelligent materials
We found that the creep and plastic deformation lead to obvious winkles at the contact surface, which may decrease the specific wear rate of PVDF thin films. (ii) Based on the fretting wear test setup, we built a new module with the effect of the voltage
In order to make a detailed description of the fretting wear behavior of piezoelectric thin films, we selected PVDF thin films as an example to give a full discussion
Summary
Piezoelectric materials are one of the most important intelligent materials. They exhibit an electric response when stress is applied (direct piezoelectric effect) and tend to deform under an applied electric field (convers piezoelectric effect). A lot of studies showed that there were many influencing factors on the fretting wear behavior of materials, including frequency [23,24], normal force [25,26], displacement amplitude [27,28], and even temperature [29,30], surface roughness and so on [31,32,33,34,35]. Presented a series of theoretic studies on two-dimensional fretting contact and axisymmetric partial slip contact of piezoceramics They provided an in-depth discussion about the effects of the friction coefficient and punch radius on the fretting contact pressure, tangential traction, in-plane stress, and in-plane electric displacement during different loading phases.
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