Force characteristics of nickel titanium closed coil springs.
Published: 2006
Language: eng
Number of pages: 109
ISBN-13: 9780494210925
Description: Four properties of nickel titanium closed coil springs were investigated: mean force, maximum force, load/deflection ratio and force degradation over 16 weeks. The force exerted by 150, 200 and 250g springs from three manufacturers (GAC SentalloyeRTM; TP ReflexRTM; Unitek(TM) Nitinol) was recorded throughout their respective published activation ranges. Twenty springs of each nominal force level were tested. The mean initial force of the GAC and Unitek(TM) springs was 6--8% and 23--36% below their nominal force, respectively. The mean initial force of the TP springs was 1--24% above their labeled force. The maximum force of the GAC and TP springs was 53--130% greater than the labeled force, whereas the Unitek(TM) springs exhibited maximum forces within 11% of their nominal values. Unitek(TM) springs generated the lowest load/deflection ratios, which best approximates constant force delivery. Only the GAC 150g springs demonstrated both statistically and clinically significant force degradation.
Notes: Source: Masters Abstracts International, Volume: 45-03, page: 1440.

Thesis (M.Sc.)--University of Toronto, 2006.

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