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Study of the shape memory effect in lamellar helical springs made from Cu-Zn-Al shape memory alloy

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: V. Dia, L.G. Bujoreanu, S. Stanciu and C. Munteanu

Editorial: Elsevier, Materials Science and Engineering: A, 481-482, p.697-701, 2008.

Rezumat:

The behavior of helical springs made from lamellar specimens of Cu-Zn-Al shape memory alloy, which were martensitic at room temperature, was analyzed in force-elongation-temperature space. The study revealed the dependence of two forms of shape memory effect (SME): (i) work-generating SME and (ii) constrained-recovery SME, upon applied load and elongation, respectively. The tensile behavior of the springs, on loading between the austenite-start and the austenite-finish temperatures showed a stiffening tendency with increasing both elongation and temperature. The lamellar helical springs were able: (i) to lift 3 N loads over 0.235 m with a rate of 7 × 10−3 m/K; (ii) to develop with a maximum rate of 0.6 N/m a recovery force as high as 24 N while being elongated by 0.232 m; (iii) to elongate by 7 × 10−2 m under the effect of a 20 N force applied at 328 K, with an average rate of 342 N/m.

Cuvinte cheie: Shape memory effect; Work generation; Lamellar helical springs; Force-elongation-temperature variations; Variation rate

URL: http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235588%232008%23995189999%23685305%23FLA%23&_cdi=5588&_pubType=J&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=c45398c5f7d9d3a11d4941b54e451fe3