Low-Cycle Fatigue Machine for Biaxial Cyclic Loading Tests

摘要

A fatigue machine was designed for low-cycle fatigue testsunder biaxial cyclic loading. This fatigue machine equippedwith two electro hydraulic servo valves， with which biaxialstresses or strains could be imposed cyclically on thin-walledtubular specimen by tension-compression and torsion，w astested for its dynamical characteristics with various means.From the results in those tests and in some fatigue tests，it was shown that this fatigue machine was satisfactory in itscapacity and characteristics to perform tne low-cycle fatiguetests under biaxial cyclic loading. Furthermore， it wasclarified that the plastic buckling strength as well as thefatigue strength in materials should be considered as the lowcyclefatigue behaviors in the tests with thin-walled tubularspecimen.