scholarly journals Investigations of the high-frequency dynamic properties of polymeric systems with quartz crystal resonators

2020 ◽  
Vol 15 (2) ◽  
pp. 021012 ◽  
Author(s):  
Kenneth R. Shull ◽  
Meredith Taghon ◽  
Qifeng Wang
Keyword(s):  
High Frequency ◽  
Quartz Crystal ◽  
Dynamic Properties ◽  
Polymeric Systems ◽  
Quartz Crystal Resonators

High frequency contact mechanics based on quartz crystal resonators: application to polymer surfaces

2002 ◽  
Vol 734 ◽  
Author(s):  
Steffen Berg ◽  
Diethelm Johannsmann
Keyword(s):  
Contact Mechanics ◽  
Friction Force ◽  
High Frequency ◽  
Quartz Crystal ◽  
Metal Contacts ◽  
Crystal Resonator ◽  
Ceramic Surfaces ◽  
Metal Metal ◽  
Shear Motion ◽  
Quartz Crystal Resonators

ABSTRACTHigh frequency contact mechanics experiments were carried with a quartz crystal resonator, the surface of which was coated with a polystyrene film. The experiment is based on the ring-down of the resonator after the electrical excitation has been stopped. When a tip touches the quartz surface, the shear motion of the quartz is perturbed, which can be used to study force-displacement and force-speed relations in the contact zone. A nonlinear spring constant κl(x) and a nonlinear friction coefficient ξl(ẋ) are explicitly derived. When a ceramic sphere touches a polymer film the friction force depends more than linearly on lateral speed. This contrasts to metal-metal contacts or contacts between ceramic surfaces, where the friction force depends either linearly of sub-linearly on speed.

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