J Korean Orthop Assoc.  1999 Dec;34(6):1067-1073.

Analysis of Tensile Strength of Double Helix Wires

• Kim YM
• Won CH
• Seo JB
• Choi ES
• Lee HS
• Ko SW

Abstract

PURPOSE
To compare the tensile properties of double helical twisting.
MATERIALS AND METHODS
21G and 18G stainless steel wires were used. Monostrand, untwisted double strand and manually twisted double helix wires were tested under gradually increasing tension force until the wires break. Data were analyzed by using a computer system to get force-strain curves.
RESULTS
Forces at the break point showed no significant differences between untwisted double strand wires and helically twisted double strand wires. Forces at the yield point deformation were proportionally increased to the degree of helical twisting until the wires were twisted 20 times (piptch number: 24/10 cm) with no more increase after then. Final strain at break point decreased by helical twisting, which means the range of plastic deformation decreased.
CONCLUSION
By helical twisting, the wires increase in elastic range and decrease in plastic deformation. Therefore, double helix wiring seemed to be a more effective method of fixation compared to the untwisted double strand wires.

Keyword

Double helix wires; Tensile strength; Elastic range

MeSH Terms

Computer Systems
Plastics
Stainless Steel
Tensile Strength*
Plastics
Stainless Steel