New Tapered-Rod Forming Process for Coil Springs

Surging in Coil Springs

The effects of aging process and preactivation on mechanical properties of nickel-titanium closed coil springs

BACKGROUND The most favorable feature of nickel-titanium (Ni-Ti) alloys in orthodontics is producing constant forces in a wide deformation range. Ni-Ti closed coils produce compressive strength and can be used for several purposes such as space closure. The aim of this study was to evaluate the effects of the aging process (temperature changes and prolonged strain) on Ni-Ti closed coils and to ...

the effects of aging process and preactivation on mechanical properties of nickel-titanium closed coil springs

background: the most favorable feature of nickel-titanium (ni-ti) alloys in orthodontics is producing constant forces in a wide deformation range. ni-ti closed coils produce compressive strength and can be used for several purposes such as space closure. the aim of this study was to evaluate the effects of the aging process (temperature changes and prolonged strain) on ni-ti closed coils and to...

Rod to coil transitions in nematic polymers

We calculate the order parameter and anisotropy (elongation) of the configurations of a nematic polymer in the nematic phase. At low temperatures we find exponentially rapid growth of chain dimensions as a function of inverse temperature. In the nematic direction the chain eventually adopts a rod-like state. The thermal activation of hairpins (abrupt reversals in chain directions) causes this b...

Supramolecular structures from rod-coil block copolymers.

One of the fascinating subjects in areas such as materials science, nanochemistry, and biomimetic chemistry is concerned with the creation of supramolecular architectures with well-defined shapes and functions. Self-assembly of molecules through noncovalent forces including hydrophobic and hydrophilic effects, electrostatic interactions, hydrogen bonding, microphase segregation, and shape effec...