Enhanced Piping System Reliability with Heat Recoverable Couplings

1987 ◽  
Vol 24 (03) ◽  
pp. 226-236
Author(s):  
William Honeywell
Keyword(s):  
Titanium Alloy ◽  
Shape Memory ◽  
Test Performance ◽  
System Reliability ◽  
Nickel Titanium ◽  
Piping System ◽  
Performance Requirements ◽  
Overall Reliability

Heat recoverable couplings (HRC's) have been used to join pipe on U.S. Navy ships since 1978. They are designed to meet demanding performance requirements and have been extensively tested. HRC's are manufactured from a nickel-titanium alloy called Tinel® and their design centers around a property of this material called "shape memory." The design of the couplings, their use history, and the function of shape memory are reviewed. The test performance of HRC's is then discussed and compared with conventional pipe joining techniques. They are shown to provide a higher overall reliability than either braze joints or socket welds.

Shape memory alloy based NiTi reinforced functionally graded material for vibration damping

2021 ◽  
pp. 146442072110355
Author(s):  
Namrata Gangil ◽  
Arshad Noor Siddiquee ◽  
Sameera Mufazzal ◽  
SM Muzakkir ◽  
Sachin Maheshwari
Keyword(s):  
Titanium Alloy ◽  
Shape Memory ◽  
Functionally Graded Material ◽  
Friction Stir Processing ◽  
Vibration Damping ◽  
Functionally Graded ◽  
Nickel Titanium ◽  
Friction Stir ◽  
Alloy Particles ◽  
Graded Material

Shape memory based high performance nickel-titanium alloy particles were embedded by friction stir processing in graded concentration on the surface of light weight commercially pure magnesium cast plates. The novel functionally graded material so developed was analyzed for microhardness evolution and vibration damping effect. The nickel-titanium alloy particles were filled in a 2.5 wide × 3 mm deep slot and embedded on the surface by friction stir processing. A shallower slot 2.5 wide × 1.5 mm deep was milled over the previously embedded surface in which nickel-titanium alloy powder was again filled and embedded on the surface by second pass friction stir processing. This sequence of pass created the graded variation in nickel-titanium alloy concentration. The so fabricated functionally graded material was cut out from the plate and it was hot-forged to 2/3 thickness and subsequently quenched. The microstructural examination confirmed homogeneous dispersion of nickel-titanium alloy particles and clear interface between high and low concentration regions. The microhardness confirmed a uniform graded variation in hardness. The vibration damping tests confirm considerable improvement in the damping capacity of the fabricated functionally graded material.

scholarly journals Characterization Techniques of a Shape Memory Nickel Titanium Alloy

Proceedings ◽  
2020 ◽  
Vol 38 (1) ◽  
pp. 15
Author(s):  
Andrade ◽  
Soares ◽  
Nobrega ◽  
Hilário ◽  
Santos
Keyword(s):  
Differential Scanning Calorimetry ◽  
Titanium Alloy ◽  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Tensile Tests ◽  
Metallic Alloys ◽  
Nickel Titanium ◽  
Metallographic Analysis ◽  
Scanning Calorimetry

This paper presents a characterization processes study of metallic alloys, more specifically the shape memory alloys (SMA) composed by Nickel and Titanium (NiTinol). Two different wire suppliers were studied, starting with metallographic analysis until observe the contours of the grain wires. Differential scanning calorimetry (DSC) test was also performed to obtain phase transformation temperatures of the NiTinol alloys. Finally, after several tensile tests, some results were obtained for stresses, strains, elasticity modules and maximum rupture deformation.

scholarly journals The use of shape memory compression anastomosis clips in cholecystojejunostomy in pigs – a preliminary study

2015 ◽  
Vol 84 (4) ◽  
pp. 403-406
Author(s):  
Piotr Holak ◽  
Marek Jalynski ◽  
Zdzisław Lekston ◽  
Izabella Babinska ◽  
Zbigniew Adamiak
Keyword(s):  
Animal Model ◽  
Titanium Alloy ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Anastomotic Site ◽  
Memory Compression ◽  
Compression Anastomosis ◽  
Surgical Tool ◽  
Preliminary Study ◽  
Positive Results

This paper reports on the use of compression anastomosis clips (CAC) in cholecystoenterostomy in an animal model. Cholecystojejunostomy was performed in 6 pigs using implants made of nickel-titanium alloy in the form of elliptical springs with two-way shape memory. The applied procedure led to the achievement of tight anastomosis with a minimal number of complications and positive results of histopathological evaluations of the anastomotic site. The results of the study indicate that shape memory NiTi clips are a promising surgical tool for cholecystoenterostomy in cats and dogs.

scholarly journals Microstructure of cryogenically treated martensitic shape memory nickel-titanium alloy

2015 ◽  
Vol 18 (4) ◽  
pp. 292 ◽  
Author(s):  
ThillaSekar Vinothkumar ◽  
Arunachalam Rajadurai ◽  
Deivanayagam Kandaswamy ◽  
Gopalakrishnan Prabhakaran
Keyword(s):  
Titanium Alloy ◽  
Shape Memory ◽  
Nickel Titanium

Effects of strain aging on two-way shape memory effect in a nickel–titanium alloy for medical application

2006 ◽  
Vol 438-440 ◽  
pp. 1093-1096 ◽  
Author(s):  
E.P. Ryklina ◽  
I.Yu. Khmelevskaya ◽  
S.D. Prokoshkin ◽  
K.E. Inaekyan ◽  
R.V. Ipatkin
Keyword(s):  
Titanium Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Strain Aging ◽  
Medical Application ◽  
Nickel Titanium

Study of the Metallographic of Nickel-Titanium Alloy Material by Using Electrochemical Polish Method

2012 ◽  
Vol 503-504 ◽  
pp. 469-472
Author(s):  
Ji Song Fu ◽  
Qiang Wang ◽  
Jian Nan Liu ◽  
Zhe Lin Cong ◽  
Shi Lei Yin
Keyword(s):  
Crystal Structure ◽  
Titanium Alloy ◽  
Shape Memory ◽  
Mechanical Characteristic ◽  
Electrochemical Corrosion ◽  
Nickel Titanium ◽  
Mechanical Polishing ◽  
New Method ◽  
Alloy Material ◽  
Shape Memory Properties

poly-crystal nickel-titanium （NiTi ）has been a potential material,because of its good superelasticity, radiopacity and shape memory properties .To study further on this material (such as mechanical characteristic,elasticity), microcosmic properties of NiTi must be known. Therefore the crystal structure seems to be very significant for research.Traditional metallographical technology makes use of mechanical polishing and corrosion.In this work,a new method of electrochemical corrosion is put forward ,which is more easily and clearly to show the crystalline grain of metal

A Dynamic Service Pool Size Configuration Mechanism for Service-Oriented Workflow

2011 ◽  
Vol 186 ◽  
pp. 499-504 ◽  
Author(s):  
Pan He ◽  
Jie Xu ◽  
Kai Gui Wu ◽  
Jun Hao Wen
Keyword(s):  
System Reliability ◽  
Environmental Changes ◽  
Point Of View ◽  
Pool Size ◽  
Reliability Model ◽  
Optimal Method ◽  
Service Oriented ◽  
Overall Reliability

Service-oriented workflows are the fundamental structures in service-oriented applications and changes in the workflow could cause dramatic changes in system reliability. In several ways to re-heal workflows in execution, re-sizing service pools in the workflow is practical and easy to implement. In order to quickly adjust to workflow or environmental changes, this paper presents a dynamic service pool size configuration mechanism from the point of view of maintaining workflow reliability. An architecture-based reliability model is used to evaluate the overall reliability of a workflow with service pools and an optimal method is proposed to get the combination of service pool size aiming at minimizing the sum of service pool size subject to the workflow reliability requirement. A case study is used to explain this method and experiment results show how to change service pool size to meet the workflow reliability requirements.

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