Determination of fatigue life of SESMA at various amplitudes and frequencies

Satisha, Vishwanath and Sateesh, VL and Senthilkumar, P and Jeevan, Naik and Dayananda, GN (2014) Determination of fatigue life of SESMA at various amplitudes and frequencies. Project Report. CSIR-NAL.

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Abstract

Super elastic shape memory alloys (SESMA) are promising materials for damping applications due to their inherent hysteresis associated solid–solid reversible phase transformations. These transformations induce a large recoverable strain in the material. In most of the applications, SMA is used in the form of thin wires subjected to low cycle fatigue. This report presents experimental studies on low cycle fatigue (LCF) life of super elastic shape memory alloy (SESMA) wires. The effect of frequency of the loading and amplitude of the strain on the fatigue life has been studied individually. Various loading frequencies have been considered to study the effect of frequency, by keeping the amplitude constant. From the experimental data, it was found that the low cycle fatigue life of the SESMA reduces with increase in the frequency. The effect of amplitude on the low cycle fatigue life of SESMA has also been studied and it was found that the SESMA cycled at lower net strain has more fatigue life than the one cycled at higher net strain. Further, the plastic strain accumulation is also more in the samples tested at the higher net strain loadings. The modulus of austenite is found to be by and large independent of the frequency and amplitude of the loading. Further, martensitic unloading modulus is by and large independent of change in minimum strain amplitudes. An attempt is also made to estimate the low cycle fatigue life of SESMA. The dissipated energy during the transformation is used as the key parameter to estimate the life cycles. From the results it can be seen that the estimation of the life cycles are well in agreement with the experimental fatigue life of the SESMA samples.

Item Type: Monograph (Project Report)
Subjects: ENGINEERING > Mechanical Engineering
Depositing User: Mr Satisha
Date Deposited: 05 Jan 2015 04:55
Last Modified: 05 Jan 2015 04:55
URI: http://nal-ir.nal.res.in/id/eprint/12064

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