RE-EXAMINATION OF MECHANICAL HYSTERESIS.
COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY
Pagination or Media Count:
Mechanical-hysteresis loops have been obtained for cycles of torsion applied to copper, brass, low-carbon steel, titanium. It is shown that the slope of the unloading line is determined by a plastic recovery p together with elastic recovery e, that pe is virtually constant for a given amplitude of cyclic twist, that pe changes systematically with amplitude, and that pe leads to an effective shear modulus that decreases with increasing amplitude in a specific way for the different metals. It is also shown that the Bauschinger effect leads to yield of a special kind, where for example cyclic torsion and static tension in combination can lead to a non-linear stressstrain relationship without leading to yield in the direction of tension. Author