Comparison of two fatigue tests: SCDU, SVECD
SCDU: simple uniaxial continuous damage fatigue test
l Two experimental temperatures, two strain levels
l Predict fatigue performance under certain temperature and load frequency
l Use the periodic load to obtain the function of fatigue damage expressed by the reverse load cycle
l Software UTS021
S-VECD: simple viscoelastic continuous damage fatigue test
l An experiment temperature
l contains fingerprintingphase
l Failure is defined as a sharp decrease in phase angle (significant spread of macro cracks)
l Use periodic loads to determine the relationship between failure and tension and strain
l Software UTS032
Introduction of S-VECD model
In 1990, Kim and Little proposed Schapery's standard asphalt nonlinear viscoelastic structure theory.
l In 1998, Lee and Kim developed the VECD model of asphalt concrete stress and strain cyclic loading
l In 2002, Daniel and Kim pointed out that damage performance is a material property, which can be determined by a simple method
l In 2009, Underwood proposed a strict and accurate simplified model
Advantage
l The experiment can be performed within the load capacity of the existing experimental equipment
l The results of this method are comparable to your strain-controlled direct tensile fatigue test and traditional beam fatigue test
l is a mechanical experiment method that contains many strict theoretical considerations, not an empirical method
l Shorter experimental practice, considering more experimental conditions, distinguishing material properties from structural components
S-VECD experimental method
1. Fingerprint experiment:
a) Determine the dynamic modulus at different frequencies and temperatures
b) Dynamic modulus: complex modulus experiment to derive the relationship between stress and strain
c) Demand parameter: initial modulus
2. Fatigue test
a) According to the results of the fingerprint experiment, repeat the load until failure
b) Demand parameters: kneading parameters, estimated strain amplitude between peak and peak
Experiment execution instrument: AMPT (UTS software)
Advantage:
l A collection of three-axis room, temperature control box, hydraulic power source, temperature control system, data acquisition control system
l 8-channel acquisition can be connected to 4 LVDT sensors and has an expansion function can be extended to 8-axis 32-channel acquisition.
l Supporting specially written experimental programs and supporting user self-programming software, which can expand product applications arbitrarily
S-VECD experiment results
Experimental sketch
Many domestic IPC users have performed this experiment: Teacher Zhao Yanqing of Dalian University of Technology
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