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Factors influencing the suitability of thermal methods for stress analysis of NiTi shape memory alloys

Factors influencing the suitability of thermal methods for stress analysis of NiTi shape memory alloys
Factors influencing the suitability of thermal methods for stress analysis of NiTi shape memory alloys
The material assumptions made to facilitate Thermoelastic Stress Analysis (TSA) are linear elasticity, material homogeneity and isotropy, and mechanical properties that are independent of temperature. The unusual shape memory and superelastic properties of near equiatomic NiTi alloys complicate the application of any experimental stress analysis technique, and in the case of TSA, make these assumptions invalid. This paper describes a detailed analysis conducted to characterise the material properties of NiTi shape memory alloys and to identify loading conditions suitable for quantitative stress analysis using TSA. The mechanical behaviour of the material in three distinct regions is considered and the suitability of each region for TSA is discussed. It is shown that the thermoelastic response is dependent on the mean stress when tested at room temperature in the pre-martensitic phase, due the presence of an intermediate R-phase. Theoretical calculations are used to confirm that this effect is related to the high temperature dependence of the material’s Young’s modulus.
NiTi alloy, superelastic, shape memory, thermoelastic stress ananlysis
1660-9336
225-230
Eaton-Evans, J.
a859e78d-28fe-4c6e-b662-9a59b65c27b8
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Little, E.G.
5e5fb90f-c4fe-45a5-bbb0-7b75cc339859
Brown, I.A.
376be713-bd0f-4353-844a-baee084af814
Eaton-Evans, J.
a859e78d-28fe-4c6e-b662-9a59b65c27b8
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Little, E.G.
5e5fb90f-c4fe-45a5-bbb0-7b75cc339859
Brown, I.A.
376be713-bd0f-4353-844a-baee084af814

Eaton-Evans, J., Dulieu-Barton, J.M., Little, E.G. and Brown, I.A. (2007) Factors influencing the suitability of thermal methods for stress analysis of NiTi shape memory alloys. Applied Mechanics and Materials, 13-14, 225-230.

Record type: Article

Abstract

The material assumptions made to facilitate Thermoelastic Stress Analysis (TSA) are linear elasticity, material homogeneity and isotropy, and mechanical properties that are independent of temperature. The unusual shape memory and superelastic properties of near equiatomic NiTi alloys complicate the application of any experimental stress analysis technique, and in the case of TSA, make these assumptions invalid. This paper describes a detailed analysis conducted to characterise the material properties of NiTi shape memory alloys and to identify loading conditions suitable for quantitative stress analysis using TSA. The mechanical behaviour of the material in three distinct regions is considered and the suitability of each region for TSA is discussed. It is shown that the thermoelastic response is dependent on the mean stress when tested at room temperature in the pre-martensitic phase, due the presence of an intermediate R-phase. Theoretical calculations are used to confirm that this effect is related to the high temperature dependence of the material’s Young’s modulus.

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More information

Submitted date: January 2005
Published date: July 2007
Keywords: NiTi alloy, superelastic, shape memory, thermoelastic stress ananlysis
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 55270
URI: http://eprints.soton.ac.uk/id/eprint/55270
ISSN: 1660-9336
PURE UUID: 88002e8e-3439-4888-9de0-f4a0a13001ed

Catalogue record

Date deposited: 28 Jul 2008
Last modified: 13 Mar 2019 20:37

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