NiTi Shape Memory Alloy Used for Multiple-Resetting Actuator for Fire Protection

Abstract:

The paper introduces the possibility to replace the “wet alloy”, used for sprinkler-triggering within automatic fire protection systems, with a shape memory alloy (SMA) type. The idea of the present application is based on the thermoelastic reversible martensitic transformation, governing SMA functioning, which has completely reversible character, and enables the occurrence of two-way shape memory effect (TWSME) after the application of a thermomechanical treatment called “training”. For this purpose a commercial NiTi rod, which was martensitic at room temperature, was subjected to thermal analysis tests, performed by differential scanning calorimetry (DSC) and dilatometry. Martensite (M) reversion to parent phase (A), during heating, was emphasized by an endothermic peak on the DSC thermogram and by a length shrinkage, on the dilatogram. The capacity to develop TWSME was revealed by the change in displacement-temperature variation, with increasing the number of training cycles. This stabilized fully reversible behavior recommends NiTi rods as executive elements of a new concept of resettable sprinkler for fire protection.

• Periodical: Materials Science Forum (Volume 907)
• Pages: 8-13
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.907.8
• Online since: September 2017
• Authors: Lucian Burlacu, Nicanor Cimpoeşu*, Nicoleta Monica Lohan, Leandru Gheorghe Bujoreanu
• Keywords: DSC, Fire Protection, Martensitic Transformation, NiTi Shape Memory Alloy, Thermal Expansion

References

[1] J. Van Humbeeck, R. Stalmans, Characteristics of shape memory alloys, in: K. Otsuka, C.M. Wayman (Eds. ), Shape Memory Materials, Cambridge University Press, London, 1998, 149-183.

[2] C. Lexcellent, Shape-memory Aloys Handbook, ISTE Willey, (2013).

[3] I. Ohkata, Y. Suzuki, The design of shape memory alloy actuators and their applications, K. Otsuka, C. M. Wayman (Eds. ), Shape Memory Materials, Cambridge University Press, London, 1998, 240-266.

[4] W. Van Moorleghem and D. Otte, The use of shape memory alloys for fire protection, in: T. W Duerig, et al. (Eds. ), Engineering Aspects of Shape Memory Alloys, Butterworth-Heinemann, 1990, 295-302.

DOI: 10.1016/b978-0-7506-1009-4.50029-9

[5] K.K. Alaneme, E.A. Okotete, Reconciling viability and cost-effective shape memory alloy options – A review of copper and iron based shape memory metallic systems, Eng. Sci. Technol., Inter. J. 19 (2016) 1582–1592.

DOI: 10.1016/j.jestch.2016.05.010

[6] S. Zhuiykov, Novel sensor–actuator device for early detection of fire, Sensor Actuat. A. 141 (2008) 89–96.

DOI: 10.1016/j.sna.2007.08.010

[7] G.S. Polan, Sprinklers with shape-memory alloy actuators, U.S. Patent 5, 494, 113. (1994).

[8] A. Johnson, R. Gilbertson, V. Martinov, Frangible shape memory alloy fire sprinkler actuator, U.S. Patent Application 0025050. (2010).

[9] L.G. Bujoreanu, Intelligent Materials (in Romanian), Junimea, Iași, (2002).

[10] N.M. Lohan, B. Pricop, L.G. Bujoreanu, N. Cimpoesu, Heating rate effects on reverse martensitic transformation in a Cu–Zn–Al shape memory alloy, Int. J. Mater. Res. 102 (2011) 1345-1351.

DOI: 10.3139/146.110595

[11] N. M. Lohan, M.G. Suru, B. Pricop, L.G. Bujoreanu, Cooling rate effects on the structure and transformation behavior of Cu-Zn-Al shape memory alloys, Int. J. Min. Met. Mater. 21 (2014) 1109-1114.

DOI: 10.1007/s12613-014-1015-5

[12] K.N. Melton, Ni-Ti Based Shape Memory Alloys, in: T. W Duerig, et al. (Eds. ), Engineering Aspects of Shape Memory Alloys, Butterworth-Heinemann, 1990, 19-35.

DOI: 10.1016/b978-0-7506-1009-4.50006-8

[13] S. Shabalovskaya, J. Anderegg, J. Van Humbeeck, Recent observations of particulates in Nitinol, Mat. Sci. Eng. A. 481–482 (2008) 431–436.

DOI: 10.1016/j.msea.2007.01.177

[14] D. Holec, On the precipitation in NiTi based shape memory alloys, Diploma thesis, Masaryk University, Brno, (2005).

[15] L.G. Bujoreanu, M.L. Young, S. Gollerthan, C. Somsen, G. Eggeler, Influence of heat treatment and microstructure on the tensile pseudoelastic response of an Ni-rich NiTi shape memory alloy, Int. J. Mater. Res. 101 (2010) 623-630.

DOI: 10.3139/146.110317