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Titolo:
Shape memory alloy coils optimized for electrical connectors
Autore:
Yurick, TJ; Mohney, SE; Gray, GL;
Indirizzi:
Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 h, University Pk, PA 16802 USA Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 n, University Pk, PA 16802 USA
Titolo Testata:
IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES
fascicolo: 3, volume: 24, anno: 2001,
pagine: 389 - 398
SICI:
1521-3331(200109)24:3<389:SMACOF>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Keywords:
electrical connector; electrical terminal; fretting; low insertion force; shape memory alloy; shape memory effect;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Yurick, TJ Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 ty Pk, PA 16802 USA
Citazione:
T.J. Yurick et al., "Shape memory alloy coils optimized for electrical connectors", IEEE T COMP, 24(3), 2001, pp. 389-398

Abstract

In an effort to reduce costs associated with automotive electrical connectors, auto manufacturers have looked to tin-coated terminals as an effectivealternative to more expensive gold-coated terminals. Tin, however, is highly subject to a wear phenomenon known as fretting corrosion, which increases the contact resistance and renders the terminals useless. One solution tominimize fretting corrosion is to increase the terminal normal force. In ordinary electrical terminals, an increased normal force leads to other problems such as high insertion and removal forces. This work is a continuationof previous research in which a Ni-Ti shape memory alloy (SMA) coil was developed in order to increase the high temperature normal force of tin-coated terminals while maintaining moderate room temperature insertion forces. In particular, this work addresses the cyclic stability of the SMA coil whensubjected to repeated temperature cycles over extended periods, the maximization of normal force provided by the coil for the amount of SMA used, andthe long-term high-temperature performance of the SMA. This research has resulted in the reduction of the SMA wire diameter by nearly 30%, an increase in high temperature removal force of the terminal from approximately 20 Nwithout the SMA to 60 N with it, and an associated reduction in cost by nearly 50% over the previous design. To accomplish these improvements, the SMA composition was changed from 55.1 wt% Ni to 49.7 wt% Ni, and the optimum training temperature for the new composition was found to be 400 degreesC.

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Documento generato il 23/01/20 alle ore 06:20:44