Abstract
Abstract: Ultrasonic fatigue tests were carried out on the polymeric material PMMA, which is used for dental applications. The resonance condition was obtained by numerical simulation and modal finite element analysis, allowing to determine the dimensions of the hourglass shape testing specimen. The process of fabrication for this polymer was undertaken too, in order to control the properties of testing material. Fatigue tests were implemented on a patented ultrasonic fatigue machine (Patent No. 323948, 2014, Mexico), which has been developed by the corresponding author and is characterized by a new and simple test control using the LabVIEW platform. The testing specimens were immersed in a solution to simulate the effect of human saliva with the corresponding pH, and to limit its degradation by temperature under the very high frequency loading. Thermographic analysis has been implemented too in order to monitoring the testing temperature in real time. Finally, the ultrasonic fatigue endurance was determined for this polymeric material together with a general investigation of the crack initiation and propagation under the described testing conditions.
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