The TE 44 Piezo Fretting Rig incorporates a piezo actuator driven by a high frequency analogue controller, which derives its set points via a 16 bit control and data acquisition card from a standard PC, running COMPEND 2020 software. Real time adaptive control features provided within the software allows high precision control of the actuator when working against highly non-linear loads. Sine, square and triangular waveforms may be programmed and at oscillating frequencies up to 100 Hz.
A servo pneumatically controlled loading system is provided for performing conventional parallel motion fretting tests. With the loading system disabled, the specimen orientation can be changed from parallel to perpendicular motion, allowing hertzian fretting, impact fretting and depth sensing micro-hardness tests to be performed. Specimen heating is provided for the parallel motion test configuration only.
Parallel Motion Fretting
Depth Sensing Micro-hardness
Type of Contact – Fretting/Sliding: Ball/Flat Flat/Flat Line/Flat Type of Movement: Sine, Square and Triangular Type of Contact – Impact Fretting: Ball/Flat @ 45 degree Impact Angle Type of Contact – Hertzian Fretting: Ball/Flat Type of Contact – Diamond Indenter: Depth Sensing Micro-hardness (Vickers) Displacement Control: Adaptive control of amplitude and mid-stoke position Actuator: Piezocomposite Stack Maximum Stroke: 100 µm Stiffness: 60 N/µm Resonant Frequency: 15 kHz Maximum Force: 12,000 N Maximum Tensile Force: 1,500 N Amplifier: 1000 volt Load Range: 5 to 1000 N Loading Rate: 50 N/s Temperature Range: Ambient to 200°C – Fretting/Sliding Only Heating Power: 200 W Temperature Sensor: k-type thermocouple Friction Force: +/-500 N Maximum Stroke – continuously variable: 0 to 100 microns Resolution: +/-0.2 microns Maximum Frequency: 500 Hz Minimum Frequency: 1 Hz Frequency Range: Continuously variable: 1 Hz to 100 Hz Maximum stroke at 100 Hz: 30 µm Maximum stroke at 50 Hz: 60 µm Maximum stroke at 20 Hz: 100 µm Stroke Measurement: Capacitance Probe Full-scale Range: 0 to 1 mm Resolution: 0.2 µm High Speed Interface: USB Resolution: 16 bit Number of Input Channels: 6 Maximum Data Rate: Six channels at 50 kHz Low Speed Interface: USB Resolution: 12 bit Number of Input Channels: 1 to 8 Number of Output Channels: 1 to 4 Maximum Data Rate: 10 Hz Controlled Parameters Frequency Waveform Stroke Mid-stroke Position Load Temperature Test Duration Measured Parameters Frequency Stroke Displacement Load Friction Temperature Depth Sensing (Micro-hardness)
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