Record number :
2162399
Title of article :
Variation of mechanical properties of shape memory alloy bars in tension under cyclic loadings
Author/Authors :
Choi، نويسنده , , Eunsoo and Nam، نويسنده , , Tae-hyun and Chung، نويسنده , , Young-Soo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
6
From page :
4412
To page :
4417
Abstract :
It is well-known that the behavior of shape memory alloys (SMAs) depends on varying the temperature and dynamic loading frequency. However, the relationship between SMA behavior and cyclic loads has not been clearly discussed. This relationship is very important in the field of seismic application of SMAs. Therefore, this study arranges several dynamic tensile tests of martensitic and austenitic SMA bars. The parameters of the tests are the initial strain of the SMA bars, the number of cycles, and the loading frequency. The hysteretic curves of the stress–strain relation are measured, and the mechanical properties of the residual strain, Youngʹs modulus is varied at first, but becomes stable after 250 cyclic loading. However, the damping ratio decreases continuously when the number of loading cycles increased. It is found that the initial strain and loading frequency do not affect the mechanical properties significantly. Only the residual strain is influenced by the amount of initial strain but not the loading frequency.
Keywords :
Shape memory alloy , Fatigue , Mechanical Property , Seismic application
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2010
Link To Document :
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