Accession Number:

AD0652361

Title:

RE-EXAMINATION OF MECHANICAL HYSTERESIS.

Descriptive Note:

Final rept.,

Corporate Author:

COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY

Personal Author(s):

• Wood,W. A.

Report Date:

1967-02-01

Pagination or Media Count:

29.0

Abstract:

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

Descriptors:

• (*HYSTERESIS
• *MECHANICS)
• TORSION
• LOADS(FORCES)
• COPPER
• STEEL
• BRASS
• TITANIUM

Subject Categories:

• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE