Abstract
Abstract The aim of the study is to analyse shape memory alloy (SMA) pipeline joints in limited space applications for all kinds of ships. Generally, the space available in various areas on ships is strictly limited and service works usually meet many obstacles. If we consider a pipeline, the flange joints always require a larger free space around the pipe than the pipe alone. A simultaneous problem can occur with the propeller shaft line coupling between bearings. SMA couplings require less space around the pipe and service should be easier, e.g., insulation fixing, painting and so on. SMA couplings last for a lifetime and there is no need for periodical seal replacement. Herein, some proposals among other unpublished data are discussed. There is a significant technological interest in the use of SMAs for applications not widely used yet. A wide variety of alloys present the shape memory effect and many generate an expressive restitution force considerable for commercial interests.
Highlights
The aim of the study is to analyse shape memory alloy (SMA) pipeline joints in limited space applications for all kinds of ships
Shape memory alloys (SMA) constitute a group of metallic materials with the ability to recover a previously defined length or shape when subjected to an appropriate thermomechanical load
When heated above can recover from a large amount of strain or generate an this temperature, the material reverts to its parent structure, expressive restitution force are of commercial interest
Summary
Shape memory alloys (SMA) constitute a group of metallic materials with the ability to recover a previously defined length or shape when subjected to an appropriate thermomechanical load. SMAs have found many technical applications, including in fluid sealing technology They are ideally suited for stationary sealing conditions, for instance in static flange pipe joints, high-pressure hydraulic fittings, pipe and tube coupling systems, fasteners, connectors and clamps in a variety of applications. These materials are utilised in dynamic sealing conditions, such as in lip radial oil seals, mechanical face seals, soft gland packing and magnetic fluid seals [5]. SMAs can exist in two of the thermal hysteresis varies with the alloy type and is different crystal structures (phases) known as martensite typically in the range of 10–50 °C. and austenite. When the SMA is below its phase transformation temperature, the material can be deformed into another shape with relatively little force
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