Processing of Single-Stage Bellows of TiNi Shape Memory Alloy Using Rubber Bulge Method

2005 ◽  
Vol 475-479 ◽  
pp. 2059-2062 ◽  
Author(s):  
Hiromasa Semba ◽  
Nagatoshi Okabe ◽  
Toru Yamaji ◽  
Keisuke Okita ◽  
Kiyoshi Yamauchi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Cold Working ◽  
Large Strain ◽  
Longitudinal Direction ◽  
Single Stage ◽  
Damping Characteristics ◽  
Annealing Conditions ◽  
New Type ◽  
Typical Shape

The bellows formed of TiNi shape memory alloy is proposed as a new type of seismic protection device. The bellows structure is known to have lower rigidity along the longitudinal direction through effect of its shape. On the other hand, TiNi is known to be one of the most typical shape memory alloys, which have high damping characteristics for dynamics engaged in its twin formation under martensite state and have the ability to recover completely from the large strain (even such as 8%) after unloaded and or heated. This paper describes a processing method of a single-stage bellows of TiNi shape memory alloy using rubber bulge method. Thin-walled TiNi tubes subjected to cold working were prepared. Several annealing conditions for the process were examined and the appropriate one was discussed. Then the rubber bulge method of displacement control was introduced. Finally, the procedure of the process including heat treatment was clarified.

Axial Compressive Behavior of Single-Stage Bellows of TiNi Shape Memory Alloy for Seismic Applications

2005 ◽  
Vol 475-479 ◽  
pp. 2055-2058 ◽  
Author(s):  
Hiromasa Semba ◽  
Nagatoshi Okabe ◽  
Toru Yamaji ◽  
Keisuke Okita ◽  
Kiyoshi Yamauchi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Large Strain ◽  
Axial Direction ◽  
Single Stage ◽  
Seismic Protection ◽  
Compression Tests ◽  
Compressive Behavior ◽  
Heat Treated ◽  
Energy Absorbing

The bellows formed of TiNi shape memory alloy (SMA) is proposed as a new type of seismic protection device. The bellows structure is known to have lower rigidity along the axial direction through effect of its shape. TiNi is known to be one of the most typical SMAs, which have high damping characteristics for dynamics engaged in its twin formation under martensite state and have the ability to recover completely from the large strain after unloaded and or heated. In this study, fundamental compressive behavior of TiNi bellows was investigated and discussed. Several shapes of TiNi single-stage bellows produced by rubber bulge method were prepared. They were heat-treated for some heat treatments and then examined on compression tests. Based on the results, the relationships among the bellows shapes and the stiffness, energy-absorbing capacity and so on were clarified. Finally, it was found from these results that single-stage bellows of TiNi SMA could be used as one of seismic protection devices.

Damping Characteristics of Cold-Rolled and Annealed Equiatomic TiNi Shape Memory Alloy

2006 ◽  
Vol 319 ◽  
pp. 9-16 ◽  
Author(s):  
S.H. Chang ◽  
Shi Kang Wu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Storage Modulus ◽  
Damping Capacity ◽  
Damping Characteristics ◽  
Annealing Conditions ◽  
Cold Rolled ◽  
Tan Δ ◽  
Short Time ◽  
And Storage

Damping capacity and storage modulus of cold-rolled and annealed Ti50Ni50 SMA are systematically investigated by DSC and DMA tests. The specimens annealed at 500 oC for 1 ~ 72 h and annealed at 650 oC for short time can all reach a high tan δ value and a deep storage modulus minimum during B2→R transformation. This reveals that the occurrence of R-phase can strongly soften the storage modulus and thus promote the damping capacity of Ti50Ni50 SMA. The specimens anneaed at 650 oC for longer time have a lower tan δ value due to the diminishing of R-phase formation. Therefore, a good damping capacity associated with a significant softening storage modulus can be acquired by suitably control the annealing conditions of cold-rolled Ti50Ni50 to generate adequate of R-phase premartensite.

Microstructure and damping characteristics of Ti50Ni24.9Cu25Y0.1 shape memory alloy

2013 ◽  
Vol 95 ◽  
pp. 125-127 ◽  
Author(s):  
Y.Y. Luo ◽  
Y.Q. Zhao ◽  
Y.F. Lu ◽  
Z.P. Xi ◽  
W.D. Zeng
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Damping Characteristics

Research on Walking Mechanism Base on Biological Metal Fibre

2013 ◽  
Vol 785-786 ◽  
pp. 1267-1272
Author(s):  
Shi Ju E ◽  
Xuan Zhong Ding
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Trajectory Planning ◽  
New Type ◽  
Simulation Results ◽  
Metal Fibre ◽  
Walking Mechanism

A new walking mechanism base on biological metal fibre is study in the paper. It used a new type of shape memory alloy (biological metal fibre, BMF) as actuator. The multilegged walking mechanism is employ and study. Its mobile mechanism and trajectory planning is analysed so as to achieve miniaturization goals. The simulation results showed that the multilegged walking mechanism could be effectively driven by the actuator base on BMF.

1914 New type stents using shape memory alloy

2005 ◽  
Vol 2005.1 (0) ◽  
pp. 481-482
Author(s):  
Kiyoshi YAMAUCHI ◽  
Yuji SUTOU ◽  
Takamitu TAKAGI ◽  
Toshio SAKUMA
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
New Type

Design of a Multiple-Actuation Shape Memory Alloy Pipe Coupler: Material Development and Characterization

2012 ◽  
Author(s):  
Majid Tabesh ◽  
John Rohmer ◽  
James G. Boyd ◽  
Dimitris C. Lagoudas ◽  
Kadri C. Atli ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Contact Pressure ◽  
Niti Alloy ◽  
Internal Surface ◽  
Alloy System ◽  
Longitudinal Direction ◽  
The State ◽  
Pipe System ◽  
Material Development

Shape memory alloy (SMA) pipe couplers use the shape memory effect to apply a contact pressure onto the surface of the pipes to be coupled. In the current research, an SMA pipe coupler is designed, fabricated and tested. The thermally induced contact pressure depends on several factors such as the dimensions and properties of the coupler-pipe system. An in-house developed NiTi alloy system is considered for the coupler. The coupling pressure is measured using strain gages mounted on the internal surface of an elastic steel ring. Thermal actuation response of the coupler is determined under both stressed and stress-free conditions. In addition, the state of anisotropy is investigated in the coupler by characterizing samples in the longitudinal and transverse directions. Unlike the commercially available NiTiNb couplers, the NiTi coupler demonstrates a multiple actuation response and higher contact pressure. The state of anisotropy is investigated in the couplers by characterizing samples in the longitudinal and transverse directions. The results show no change in transformation temperatures with respect to two perpendicular transverse and longitudinal directions, however, the material can undergo higher transformation strains in the longitudinal direction.

scholarly journals Effect of Cold Working Ratio on Available Strain Energy of Ti-Ni-Cu Shape Memory Alloy.

2000 ◽  
Vol 79 (10) ◽  
pp. 1020-1027
Author(s):  
Toshio SAKUMA ◽  
Uichi IWATA ◽  
Yasuo OCHI ◽  
Shuichi MIYAZAKI
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Strain Energy ◽  
Cold Working
Sign in / Sign up

Export Citation Format

Share Document