Abstract:Aimed at the accuracy problem of biaxial fatigue test system, the accuracy calibration scheme was proposed of the typical cross thinned testing specimen tensiontension fatigue practicality tests on basis of strainstress method. Through realtime collecting and dynamic indicating the stressstrain data and waveform of corresponding monitoring point, the judgment could be made whether additional moment existed inside twisted and outside bend, as well as the check of load sensor of dynamic accuracy and the amplitude, phase, frequency, and waveform of load feedback value could be performed. The calibration shows that the biaxial fatigue test system with its tools and fixtures are able to ensure the test of coaxiality, centering, plane and freedom, and others, with good accuracy, and the test database is reliable and valid.