The Mechanical Properties of Organic Films were Tested by Piezoelectric Ceramic Actuators and Force Sensors
A set of equipment was built using a piezoelectric ceramic actuator and a force sensor.We used this equipment to measure the loading-unloading curves of six organic films:polymethyl methacrylate(PMMA),polyethylene terephthalate(PET),polyethylene(PE),polyimide(PI),polytetrafluoroethylene(PTFE)and polydimethylsiloxane(PDMS).We used the Lennard-Jones potential theory to explain the relationship between intermolecular force and distance,and then derived a formula to understand and fit the loading-unloading curves.Based on the fitting parameters of the loading-unloading curve,the Young's modulus of these organic films was calculated.By comparing these test results with those obtained from the nanoindenter,we verified the feasibility and accuracy of the constructed equipment for measuring the loading-unloading curves of organic films.Unlike the nano-indentation instrument,which changes the load when the indented depth is measured,the built equipment obtains the loading-unloading curve by changing the indented depth when the load is measured.The equipment we built is more convenient to use and lower in cost.It does not require harsh testing environments and testing conditions,or even sample preparation.It can perform in-situ real-time measurements,and can also be used as a'finger'for robots to sense the mechanical properties of materials.
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