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Journal of Materials Engineering and Performance

Published in:

01-07-2014

Simulations of Mechanical Response of Superelastic NiTi Helical Spring and its Relation to Fatigue Resistance

Authors: P. Sedlák, M. Frost, A. Kruisová, K. Hiřmanová, L. Heller, P. Šittner

Published in: Journal of Materials Engineering and Performance | Issue 7/2014

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Abstract

Behavior of NiTi shape memory alloys under complex loading is still a subject of both experimental and theoretical investigations. One of the simplest geometries, in which the material is loaded in combined mode and which has also several practical applications, is a simple helical spring. In this contribution, mechanical response of NiTi superelastic spring is analyzed in detail by numerical simulation and the results are compared to experiments. The simulations show complex stress state, which develops during spring stretching. Analyzing fatigue tests with respect to simulated behavior allowed us to find relation between fatigue resistance and periodic changes in volume fraction of martensite induced by cyclic mechanical loading. The work also underlines an extension of the range of stroke amplitudes guaranteeing enhanced life performance of the spring when material transforms through the R-phase.

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Let us note that there is a direct relation between dissipation function and corresponding yield function through Legendre transformation if some mathematical assumptions are satisfied.

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Title: Simulations of Mechanical Response of Superelastic NiTi Helical Spring and its Relation to Fatigue Resistance
Authors: P. Sedlák
M. Frost
A. Kruisová
K. Hiřmanová
L. Heller
P. Šittner
Publication date: 01-07-2014
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 7/2014
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-014-0906-y

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