Due to a distinct nature of thermomechanical smart materials' reaction to applied loads, a revolutionary approach is needed to measure the hardness and to understand its size effect for pseudoelastic NiTi shape memory alloys (SMAs) during the solid-state phase transition. Spherical hardness is increased with depths during the phase transition in NiTi SMAs. This behaviour is contrary to the decr...

We have investigated the effect of pressure and thermal ageing on transformation behavior of Ni-%45.16Ti shape memory alloy. 70-320 MPa pressure was applied and annealed at 500 o C for 2 hour to see the effect of applied pressure on transformation temperature. It was observed that the starting and final temperature of austenit increased, the martensite start temperature almost remain constant a...

The non-linear nature of the superelastic phase transformation in NiTi means that conventional fatigue life theory is difficult to apply. The volume fraction of martensite/parent phase and its role in the fatigue mechanism is not understood. This paper considers the fatigue life of superelastic NiTi alloys when tested at 2Hz in Ringers solution. In agreement with other researchers [1] [2] it wa...

This study aims to design vibration isolators, using two types of coil springs with different hysteresis, and evaluate the isolation performance each design. Vibration is achieved through nonlinear spring characteristics isolators an origami-inspired foldable structure attached spring, which have quasi-zero stiffness. However, exhibited load-displacement curves between expansion contraction pro...

Abstract The structural design of a mechanical temperature-driven shut-off valve used in the water and steam sampling device power plant is designed using Iventor drawing software. A NiTi shape memory alloy with high temperature-sensitivity as driven spring to control opening closing valve. In addition structures common parts valve, calculation parameter-design are also carried out. unimpeded c...