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OUTLINE – TEST EQUIPMENT (1/2)

Christian-Doppler-Laboratory for Performance-based Optimization of Flexible Pavements, Vienna University of Technology, Austria 4PBT-WORKSHOP Results from 4-Point-Bending Beam Calibration Markus Spiegl. OUTLINE – TEST EQUIPMENT (1/2).

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OUTLINE – TEST EQUIPMENT (1/2)

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  1. Christian-Doppler-Laboratory forPerformance-based Optimization of Flexible Pavements, Vienna University of Technology, Austria • 4PBT-WORKSHOP • Results from 4-Point-Bending Beam Calibration • Markus Spiegl Delft – March 2007; Markus SPIEGL

  2. OUTLINE – TEST EQUIPMENT (1/2) • servo hydraulic test equipment, with a software for test controlling • software “DionPro” with tools for programming a test procedure • software for data analysis • (fatigue and stiffness) • load cell • (accuracy class 0.5) • temperature chamber • (-25 to +60 °C) • frequencies: 0.1 to 40 Hz • max amplitude of 0.5 mm • at 10 Hz Delft – March 2007; Markus SPIEGL

  3. OUTLINE – TEST EQUIPMENT (2/2) • stress and strain controlled tests possible • specimen dimensions: • surface layers: 50*50*450 mm • base layers: 60*60*500 mm • 2 LVDT’s (± 1.0 mm, • accuracy class 1.0) • specimen preparation with a • segment roller compactor • cut on all sides • clamps are clued with • a two-component adhesive Delft – March 2007; Markus SPIEGL

  4. CHECK OF THE TEST EQUIPMENT • Institute for Mechanics and Mechatronics – TU Vienna • Research areas: • machine dynamics • measurement and actuators • measurement of vibrations • mechatronical systems • http://www.mdmt.tuwien.ac.at • Verification of test equipment using acceleration sensors and a stroboscope: • frequencies (0.1 to 40 Hz)  variation of 0.05 Hz • resonance frequency of the system  24.5 Hz • moving parts • translation and frequency (response) • asphalt beam Delft – March 2007; Markus SPIEGL

  5. w … circular frequency [rad/s] and not test frequency in [Hz] m … mass factor [kg] not in [g] CALIBRATION • strain controlled test • three different calibration beams • twice per year - whole system with all 3 beams • twice per year - 2 LVDTs with micrometer screw • 10 different frequencies at one temperature • sine regression for obtaining dynamic data (amplitude, phase angle,…) • stiffness is calculated with the formulas after EN 12697-26 (mistake!!!) Delft – March 2007; Markus SPIEGL

  6. CALIBRATION BEAMS Delft – March 2007; Markus SPIEGL

  7. DOKUMENTATION • test report • date • operator • code of beam • E*, E1, E2 and phase angle • diagram Delft – March 2007; Markus SPIEGL

  8. CALIBRATION RESULTS – BEAM 501 Delft – March 2007; Markus SPIEGL

  9. CALIBRATION RESULTS – BEAM 502 Delft – March 2007; Markus SPIEGL

  10. CALIBRATION RESULTS – BEAM 503 Delft – March 2007; Markus SPIEGL

  11. CONCLUSIONS • good function of test equipment  check through verification tests by the Institute for Mechanics and Mechatronics • rotation and translation (movies) • stiffness values corresponding to producer specification • good repeatability • E* standard deviation less than 0.5 % • test equipment fulfills the requirements of the EN 12697-26 Delft – March 2007; Markus SPIEGL

  12. Thank youfor your attention !mspiegl@istu.tuwien.ac.at Delft – March 2007; Markus SPIEGL

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