The mechanical behaviours of polyurethanes hybrid polymer composites embedded with Nickel- Titanium (NiTi) shape memory alloys
- Sanusi, Kazeem Oladele, Ayodele, Olukayode Lawrence
- Authors: Sanusi, Kazeem Oladele , Ayodele, Olukayode Lawrence
- Date: 2016
- Subjects: Shape memory alloys , Composite , smart materials
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/216641 , uj:21533 , Citation: Sanusi, K.O & Ayodele, O.L. 2016. The mechanical behaviours of polyurethanes hybrid polymer composites embedded with Nickel- Titanium (NiTi) shape memory alloys.
- Description: Abstract: In this study, polyurethanes embedded with Nickel-Titanium (NiTi) SMAs is investigated by experimental methods to understand the mechanical properties of the embedded SMAs with the aim of using them as active and passive surfaces in various applications. A matrix composite was utilized for the production of the silicone moulds and casting of the specimens. The implanted NiTi SMA wires were cut into required lengths using and aged at 2500C and pre-strained by 3%. to ensure homogeneous behaviour. For each of the SMA/polyurethane composites, the treated NiTi SMA wire was properly located in the groove created in one half of the silicone mould the polyurethane resin was poured and cool to room temperature in vacuum casting machine. The result shows that the mechanical properties embedded SMA increased in of the SMA/polyurethane composite. The improvements in the properties cannot be sustained at high temperature owing to degradation of interfacial strength between the SMA and polyurethane 2 interface due to high recovery stress generated by the SMA upon activation...
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- Authors: Sanusi, Kazeem Oladele , Ayodele, Olukayode Lawrence
- Date: 2016
- Subjects: Shape memory alloys , Composite , smart materials
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/216641 , uj:21533 , Citation: Sanusi, K.O & Ayodele, O.L. 2016. The mechanical behaviours of polyurethanes hybrid polymer composites embedded with Nickel- Titanium (NiTi) shape memory alloys.
- Description: Abstract: In this study, polyurethanes embedded with Nickel-Titanium (NiTi) SMAs is investigated by experimental methods to understand the mechanical properties of the embedded SMAs with the aim of using them as active and passive surfaces in various applications. A matrix composite was utilized for the production of the silicone moulds and casting of the specimens. The implanted NiTi SMA wires were cut into required lengths using and aged at 2500C and pre-strained by 3%. to ensure homogeneous behaviour. For each of the SMA/polyurethane composites, the treated NiTi SMA wire was properly located in the groove created in one half of the silicone mould the polyurethane resin was poured and cool to room temperature in vacuum casting machine. The result shows that the mechanical properties embedded SMA increased in of the SMA/polyurethane composite. The improvements in the properties cannot be sustained at high temperature owing to degradation of interfacial strength between the SMA and polyurethane 2 interface due to high recovery stress generated by the SMA upon activation...
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Effects on microstructure and material properties for TiNiCo shape memory alloy
- Soni, Hargovind, Mashinini, Madindwa Peter
- Authors: Soni, Hargovind , Mashinini, Madindwa Peter
- Date: 2020
- Subjects: Shape memory alloys , Wire Spark Discharge Machining , Optimisation
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/411280 , uj:34555 , Citation: Soni, H. & Mashinini, M.P. 2020. Effects on microstructure and material properties for TiNiCo shape memory alloy.
- Description: Abstract: Wire spark discharge machining of TiNiCo alloys for bone staple applications is presented. Vacuum arc melting furnace was used to developed TiNiCo alloys with varied cobalt content (1, 5 and 10 at. %). Investigation has been performed to study the material removal rate (MRR) and surface quality (Ra) as per the experimental design planned for L33 array. Input process parameters are Pulse on/off duration servo voltage, wire speed and servo feed. From the responses on MRR and Ra optimal process condition were identified using multi objective grey analysis. It is understood that the results obtained for different combination of materials are insignificant due to the property of element weight percentage. Surface of bone staple (Non-implanted) is characterized with respect to surface morphology, surface topography, recast layer thickness, micro hardness and residual stresses. The smoother machined surface and compressive residual stresses have been noticed which are favourable in improving the fatigue life of machined bone staples. Keywords: Shape memory alloys, Wire Spark Discharge Machining,
- Full Text:
- Authors: Soni, Hargovind , Mashinini, Madindwa Peter
- Date: 2020
- Subjects: Shape memory alloys , Wire Spark Discharge Machining , Optimisation
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/411280 , uj:34555 , Citation: Soni, H. & Mashinini, M.P. 2020. Effects on microstructure and material properties for TiNiCo shape memory alloy.
- Description: Abstract: Wire spark discharge machining of TiNiCo alloys for bone staple applications is presented. Vacuum arc melting furnace was used to developed TiNiCo alloys with varied cobalt content (1, 5 and 10 at. %). Investigation has been performed to study the material removal rate (MRR) and surface quality (Ra) as per the experimental design planned for L33 array. Input process parameters are Pulse on/off duration servo voltage, wire speed and servo feed. From the responses on MRR and Ra optimal process condition were identified using multi objective grey analysis. It is understood that the results obtained for different combination of materials are insignificant due to the property of element weight percentage. Surface of bone staple (Non-implanted) is characterized with respect to surface morphology, surface topography, recast layer thickness, micro hardness and residual stresses. The smoother machined surface and compressive residual stresses have been noticed which are favourable in improving the fatigue life of machined bone staples. Keywords: Shape memory alloys, Wire Spark Discharge Machining,
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