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Dettagli della rivista
Formato
Rivista
eISSN
2083-4799
Pubblicato per la prima volta
23 Sep 2008
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 17 (2017): Edizione 3 (September 2017)

Dettagli della rivista
Formato
Rivista
eISSN
2083-4799
Pubblicato per la prima volta
23 Sep 2008
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

5 Articoli
access type Accesso libero

Al-Pillared-Montmorillonite (AlPMt)/Poly(Methyl Methacrylate)(PMMA) Nanocomposites: The Effects of Solvent Types and Synthesis Methods

Pubblicato online: 25 Oct 2017
Pagine: 5 - 23

Astratto

Abstract

Al-pillared-montmorillonite (AlPMt)/poly(methyl methacrylate)(PMMA) nanocomposites were synthesized via melt blending method (MBM) and solution blending method (SBM). FTIR-ATR spectroscopy proved the interaction of AlPMt with PMMA polymer matrix. The thermogravimetric and differential scanning calorimeter analyses showed that the thermal stability and the glass transition temperature (Tg) of polymer matrix shifted to higher temperatures with increasing AlPMt content. Images showed that AlPMt dispersed at nanometer scale in polymer matrix. Contact angle measurements demonstrated that the hydrophilicity of the PMMA increased with incorporation of AlPMt. However, the thermal stability of clay/polymer nanocomposites (CPNs) was significantly changed with CPN preparation method.

Parole chiave

  • Poly(methyl methacrylate)
  • Al-pillared-montmorillonite
  • nanocomposite
  • thermal stability
access type Accesso libero

Polyamide 1010/Polythioamide Blend Reinforced with Graphene Nanoplatelet for Automotive Part Application

Pubblicato online: 25 Oct 2017
Pagine: 24 - 36

Astratto

Abstract

Novel polythioamide (PTA) was prepared and blended with polyamide 1010 (PA1010). Based on morphology, molecular weight, polydispersity index, thermal, and shear stress behavior, PA1010/PTA (90:10) blend was opted as matrix for graphene nanoplatelet (GNP) reinforcement. Inclusion of functional GNP resulted in crumpled gyroid morphology. T0 (502°C) of PA1010/PTA/GNP was increased by 145°C than unfilled blend (357°C). Limiting oxygen index measurement indicated better non-flammability of PA1010/PTA/GNP1-3 nanocomposites (53-55%) relative to PA1010/PTA1-3 (41-48%). PA1010/PTA/GNP1-3 also attained V-0 rating in UL94. Furthermore, PA1010/PTA/GNP3 nanocomposite revealed optimum tensile strength (40 MPa), impact strength (1.9 MPa), and flexural modulus (1373 MPa) to manufacture automotive part.

Parole chiave

  • Polyamide 1010
  • graphene nanoplatelet
  • automotive
access type Accesso libero

Inspection of Gas Pipelines Using Magnetic Flux Leakage Technology

Pubblicato online: 25 Oct 2017
Pagine: 37 - 45

Astratto

Abstract

Magnetic non-destructive testing methods can be classified into the earliest methods developed for assessment of steel constructions. One of them is the magnetic flux leakage technology. A measurement of the magnetic flux leakage is quite commonly used for examination of large objects such as tanks and pipelines. Construction of a magnetic flux leakage tool is relatively simple, but a quantitative analysis of recorded data is a difficult task. Therefore, methods of magnetic flux leakage signal processing and analysis are still under development. A magnetic flux leakage in-line-inspection tool called FLUMAG 500 was constructed. FLUMAG 500 was designed for gas and oil pipelines inspection. In this paper principle of operation of FLUMAG 500 was described. Advanced algorithms of the signal processing and analysis was also developed. Results coming from the development stage as well as from the final construction of the tool were presented. Analysis of these results shows that FLUMAG 500 is a suitable tool for detection of corrosion defects in a pipeline wall.

Parole chiave

  • in-line inspection
  • magnetic flux leakage
  • pipeline inspection gauge
access type Accesso libero

Application of 3D DIC Displacement Field Measurement in Residual Stress Calculations

Pubblicato online: 25 Oct 2017
Pagine: 46 - 53

Astratto

Abstract

The knowledge of residual stress distribution is of great importance from the viewpoint of both, industrial and basal research. The most commonly utilized method of residual stress determination is based on strain measurements near the drilled holes of known geometry made by means of tensometric rosettes. An alternative to tensometers way of strain measurement is Digital Image Correlation (DIC). This optical method utilizes digital images registered during observed object deformation and delivers results in the form of displacement field maps consisting of hundreds or thousands of data points. Therefore, it is possible to deliver much more data in comparison to rosettes (only 3 or 6 tensometers, usually) and use them in the inverse method numeric procedure for residual stress calculations. In the paper the experimental stand consisting of micro driller and stereo imaging system for 3D DIC measurement and its application to residual stress estimation in prestrained steel samples are presented followed by obtained results discussion.

Parole chiave

  • residual stress
  • Digital Image Correlation (DIC)
  • inverse method
access type Accesso libero

Prosthetic Elements Made of the Ti-13Zr-13Nb Alloy by Selective Laser Melting

Pubblicato online: 25 Oct 2017
Pagine: 54 - 61

Astratto

Abstract

The fabrication of the prosthetic foundations and bridges from the Ti-13Zr-13Nb alloy is described. The process was started from CAD/CAM design of 3D models of the foundations based on scanning of patient’s mouth. Next, 3D models were transformed into *.stl files for the manufacturing stage and then the manufacturing process by means of the selective laser melting with the SLM Realizer 100 equipment was made. The intrinsic structure of the obtained parts was investigated with X-ray microtomography. The observed imperfections in the foundation's internal structure can be eliminated by a proper setting of the laser melting process. The thermal stresses, which resulted of the temperature change during melting and caused the bending of titanium made bridges, were eliminated at a design stage.

Parole chiave

  • foundations and bridges
  • rapid prototyping
  • selective laser melting
  • titanium alloys
5 Articoli
access type Accesso libero

Al-Pillared-Montmorillonite (AlPMt)/Poly(Methyl Methacrylate)(PMMA) Nanocomposites: The Effects of Solvent Types and Synthesis Methods

Pubblicato online: 25 Oct 2017
Pagine: 5 - 23

Astratto

Abstract

Al-pillared-montmorillonite (AlPMt)/poly(methyl methacrylate)(PMMA) nanocomposites were synthesized via melt blending method (MBM) and solution blending method (SBM). FTIR-ATR spectroscopy proved the interaction of AlPMt with PMMA polymer matrix. The thermogravimetric and differential scanning calorimeter analyses showed that the thermal stability and the glass transition temperature (Tg) of polymer matrix shifted to higher temperatures with increasing AlPMt content. Images showed that AlPMt dispersed at nanometer scale in polymer matrix. Contact angle measurements demonstrated that the hydrophilicity of the PMMA increased with incorporation of AlPMt. However, the thermal stability of clay/polymer nanocomposites (CPNs) was significantly changed with CPN preparation method.

Parole chiave

  • Poly(methyl methacrylate)
  • Al-pillared-montmorillonite
  • nanocomposite
  • thermal stability
access type Accesso libero

Polyamide 1010/Polythioamide Blend Reinforced with Graphene Nanoplatelet for Automotive Part Application

Pubblicato online: 25 Oct 2017
Pagine: 24 - 36

Astratto

Abstract

Novel polythioamide (PTA) was prepared and blended with polyamide 1010 (PA1010). Based on morphology, molecular weight, polydispersity index, thermal, and shear stress behavior, PA1010/PTA (90:10) blend was opted as matrix for graphene nanoplatelet (GNP) reinforcement. Inclusion of functional GNP resulted in crumpled gyroid morphology. T0 (502°C) of PA1010/PTA/GNP was increased by 145°C than unfilled blend (357°C). Limiting oxygen index measurement indicated better non-flammability of PA1010/PTA/GNP1-3 nanocomposites (53-55%) relative to PA1010/PTA1-3 (41-48%). PA1010/PTA/GNP1-3 also attained V-0 rating in UL94. Furthermore, PA1010/PTA/GNP3 nanocomposite revealed optimum tensile strength (40 MPa), impact strength (1.9 MPa), and flexural modulus (1373 MPa) to manufacture automotive part.

Parole chiave

  • Polyamide 1010
  • graphene nanoplatelet
  • automotive
access type Accesso libero

Inspection of Gas Pipelines Using Magnetic Flux Leakage Technology

Pubblicato online: 25 Oct 2017
Pagine: 37 - 45

Astratto

Abstract

Magnetic non-destructive testing methods can be classified into the earliest methods developed for assessment of steel constructions. One of them is the magnetic flux leakage technology. A measurement of the magnetic flux leakage is quite commonly used for examination of large objects such as tanks and pipelines. Construction of a magnetic flux leakage tool is relatively simple, but a quantitative analysis of recorded data is a difficult task. Therefore, methods of magnetic flux leakage signal processing and analysis are still under development. A magnetic flux leakage in-line-inspection tool called FLUMAG 500 was constructed. FLUMAG 500 was designed for gas and oil pipelines inspection. In this paper principle of operation of FLUMAG 500 was described. Advanced algorithms of the signal processing and analysis was also developed. Results coming from the development stage as well as from the final construction of the tool were presented. Analysis of these results shows that FLUMAG 500 is a suitable tool for detection of corrosion defects in a pipeline wall.

Parole chiave

  • in-line inspection
  • magnetic flux leakage
  • pipeline inspection gauge
access type Accesso libero

Application of 3D DIC Displacement Field Measurement in Residual Stress Calculations

Pubblicato online: 25 Oct 2017
Pagine: 46 - 53

Astratto

Abstract

The knowledge of residual stress distribution is of great importance from the viewpoint of both, industrial and basal research. The most commonly utilized method of residual stress determination is based on strain measurements near the drilled holes of known geometry made by means of tensometric rosettes. An alternative to tensometers way of strain measurement is Digital Image Correlation (DIC). This optical method utilizes digital images registered during observed object deformation and delivers results in the form of displacement field maps consisting of hundreds or thousands of data points. Therefore, it is possible to deliver much more data in comparison to rosettes (only 3 or 6 tensometers, usually) and use them in the inverse method numeric procedure for residual stress calculations. In the paper the experimental stand consisting of micro driller and stereo imaging system for 3D DIC measurement and its application to residual stress estimation in prestrained steel samples are presented followed by obtained results discussion.

Parole chiave

  • residual stress
  • Digital Image Correlation (DIC)
  • inverse method
access type Accesso libero

Prosthetic Elements Made of the Ti-13Zr-13Nb Alloy by Selective Laser Melting

Pubblicato online: 25 Oct 2017
Pagine: 54 - 61

Astratto

Abstract

The fabrication of the prosthetic foundations and bridges from the Ti-13Zr-13Nb alloy is described. The process was started from CAD/CAM design of 3D models of the foundations based on scanning of patient’s mouth. Next, 3D models were transformed into *.stl files for the manufacturing stage and then the manufacturing process by means of the selective laser melting with the SLM Realizer 100 equipment was made. The intrinsic structure of the obtained parts was investigated with X-ray microtomography. The observed imperfections in the foundation's internal structure can be eliminated by a proper setting of the laser melting process. The thermal stresses, which resulted of the temperature change during melting and caused the bending of titanium made bridges, were eliminated at a design stage.

Parole chiave

  • foundations and bridges
  • rapid prototyping
  • selective laser melting
  • titanium alloys

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