sami allagui - Academia.edu (original) (raw)

Papers by sami allagui

Research paper thumbnail of In-situ health monitoring of thermoplastic bio-composites using acoustic emission

Journal of Thermoplastic Composite Materials, Feb 1, 2023

This article aims to accomplish research’s that has been achieved recently in the scientific comm... more This article aims to accomplish research’s that has been achieved recently in the scientific community on the manufacturing monitoring and structural health monitoring (SHM) of composite materials using in-situ piezoelectric sensors. A series of specimens of flax/Elium composite laminates with and without integrated piezoelectric sensors were subject to static and fatigue tensile tests. The effects of introducing the sensor into the composite materials were studied. Moreover, the Acoustic Emission (AE) method was used during experimental tests to follow the gradual degradation and damage evolution in the bio-composites. The AE data were analyzed by the k-means unsupervised pattern recognition algorithm. Moreover, the characteristics of the acoustic signals detected from specimens with and without integrated sensors were compared. The experimental results show that the integration of piezoelectric sensors within the flax/Elium composite without degrading its mechanical properties is possible. In addition, the integrated sensor shows good results regarding class detection and separation. The in-situ health monitoring methods performed on bio-composites presents an excellent alternative to the conventional technique in which sensors are generally bonded to the material surface.

Research paper thumbnail of Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite: Experimental and Numerical Studies

Journal of Renewable Materials, 2021

Research paper thumbnail of Thermoplastic Elium Recycling: Mechanical Behaviour and Damage Mechanisms Analysis by Acoustic Emission

Springer eBooks, 2021

This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’... more This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’s the first liquid thermoplastic resin that provides the production of composite materials with an interesting mechanical behavior. Until now, its recyclable character is unjustified. It appeared on the resin market in 2014. But until now, no studies were available concerning how it can be recycled and reused. For this study, a thermocompression recycling process was investigated and applied to Elium resin. Three levels of recycling were carried out on the initial material. The recycled specimens were investigated and tested by means of tensile tests. Also, the acoustic emission (AE) technique was used to characterize microstructural damage events leading to overall failure of the recycled Elium. This study has been further supported by scanning electron microscopy (SEM) micrographs of the fractured face. The results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling operations. Conversely, recycling induces a rise in the elastic modulus. Also, the acoustic emission technique associated with SEM observation showed two classes of damage mechanisms. A first “class A” related to “matrix cracking” and a second “class B” associated to matrix/matrix friction.

Research paper thumbnail of Manufacturing of Sandwich Structure with Recycled Flax/Elium Skins

Lecture notes in mechanical engineering, Sep 21, 2021

Research paper thumbnail of Integrated health monitoring of unidirectional bio-composites

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2019

Research paper thumbnail of Integration of Piezoelectric Sensors in Biocomposite Materials for Structural Health Monitoring by Acoustic Emission

HAL (Le Centre pour la Communication Scientifique Directe), Apr 11, 2022

Research paper thumbnail of In-situ health monitoring of thermoplastic bio-composites using acoustic emission

Journal of Thermoplastic Composite Materials

This article aims to accomplish research’s that has been achieved recently in the scientific comm... more This article aims to accomplish research’s that has been achieved recently in the scientific community on the manufacturing monitoring and structural health monitoring (SHM) of composite materials using in-situ piezoelectric sensors. A series of specimens of flax/Elium composite laminates with and without integrated piezoelectric sensors were subject to static and fatigue tensile tests. The effects of introducing the sensor into the composite materials were studied. Moreover, the Acoustic Emission (AE) method was used during experimental tests to follow the gradual degradation and damage evolution in the bio-composites. The AE data were analyzed by the k-means unsupervised pattern recognition algorithm. Moreover, the characteristics of the acoustic signals detected from specimens with and without integrated sensors were compared. The experimental results show that the integration of piezoelectric sensors within the flax/Elium composite without degrading its mechanical properties is ...

Research paper thumbnail of Integrated health monitoring of unidirectional bio-composites

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2019

Research paper thumbnail of Experimental studies of mechanical behavior and damage mechanisms of recycled flax/Elium thermoplastic composite

Polymers and Polymer Composites

The aim of this study is to investigate the effects of recycling on the mechanical properties of ... more The aim of this study is to investigate the effects of recycling on the mechanical properties of Elium resin reinforced by flax fibers. A thermocompression recycling process is investigated and applied to production waste of thermoplastic composites. Five recycling operations are carried out on the initial material. Specimens are tested under static and fatigue tensile tests. In addition, the acoustic emission technique is used to identify damage mechanisms evolution during mechanical tests. Recorded events are post processed by the k-means unsupervised pattern recognition algorithm. The classes of acoustic emissions obtained are correlated with scanning electron microscopy observations to justify the existence of damage mechanisms detected. Results of static tests show that the ultimate tensile properties of the composites studied decrease with recycling operations. However, an increase in the elastic modulus is reported. In the fatigue tests, results show that stiffness, hysteresi...

Research paper thumbnail of Thermoplastic Elium Recycling: Mechanical Behaviour and Damage Mechanisms Analysis by Acoustic Emission

Applied Condition Monitoring, 2021

This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’... more This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’s the first liquid thermoplastic resin that provides the production of composite materials with an interesting mechanical behavior. Until now, its recyclable character is unjustified. It appeared on the resin market in 2014. But until now, no studies were available concerning how it can be recycled and reused. For this study, a thermocompression recycling process was investigated and applied to Elium resin. Three levels of recycling were carried out on the initial material. The recycled specimens were investigated and tested by means of tensile tests. Also, the acoustic emission (AE) technique was used to characterize microstructural damage events leading to overall failure of the recycled Elium. This study has been further supported by scanning electron microscopy (SEM) micrographs of the fractured face. The results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling operations. Conversely, recycling induces a rise in the elastic modulus. Also, the acoustic emission technique associated with SEM observation showed two classes of damage mechanisms. A first “class A” related to “matrix cracking” and a second “class B” associated to matrix/matrix friction.

Research paper thumbnail of Thermoplastic Elium Recycling: Mechanical Behaviour and Damage Mechanisms Analysis by Acoustic Emission

This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’... more This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’s the first liquid thermoplastic resin that provides the production of composite materials with an interesting mechanical behavior. Until now, its recyclable character is unjustified. It appeared on the resin market in 2014. But until now, no studies were available concerning how it can be recycled and reused. For this study, a thermocompression recycling process was investigated and applied to Elium resin. Three levels of recycling were carried out on the initial material. The recycled specimens were investigated and tested by means of tensile tests. Also, the acoustic emission (AE) technique was used to characterize microstructural damage events leading to overall failure of the recycled Elium. This study has been further supported by scanning electron microscopy (SEM) micrographs of the fractured face. The results obtained show that the failure tensile properties of Elium resin as wel...

Research paper thumbnail of Manufacturing of Sandwich Structure with Recycled Flax/Elium Skins

Lecture Notes in Mechanical Engineering, 2021

Research paper thumbnail of Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite: Experimental and Numerical Studies

Journal of Renewable Materials, 2021

Research paper thumbnail of In-situ health monitoring of thermoplastic bio-composites using acoustic emission

Journal of Thermoplastic Composite Materials, Feb 1, 2023

This article aims to accomplish research’s that has been achieved recently in the scientific comm... more This article aims to accomplish research’s that has been achieved recently in the scientific community on the manufacturing monitoring and structural health monitoring (SHM) of composite materials using in-situ piezoelectric sensors. A series of specimens of flax/Elium composite laminates with and without integrated piezoelectric sensors were subject to static and fatigue tensile tests. The effects of introducing the sensor into the composite materials were studied. Moreover, the Acoustic Emission (AE) method was used during experimental tests to follow the gradual degradation and damage evolution in the bio-composites. The AE data were analyzed by the k-means unsupervised pattern recognition algorithm. Moreover, the characteristics of the acoustic signals detected from specimens with and without integrated sensors were compared. The experimental results show that the integration of piezoelectric sensors within the flax/Elium composite without degrading its mechanical properties is possible. In addition, the integrated sensor shows good results regarding class detection and separation. The in-situ health monitoring methods performed on bio-composites presents an excellent alternative to the conventional technique in which sensors are generally bonded to the material surface.

Research paper thumbnail of Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite: Experimental and Numerical Studies

Journal of Renewable Materials, 2021

Research paper thumbnail of Thermoplastic Elium Recycling: Mechanical Behaviour and Damage Mechanisms Analysis by Acoustic Emission

Springer eBooks, 2021

This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’... more This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’s the first liquid thermoplastic resin that provides the production of composite materials with an interesting mechanical behavior. Until now, its recyclable character is unjustified. It appeared on the resin market in 2014. But until now, no studies were available concerning how it can be recycled and reused. For this study, a thermocompression recycling process was investigated and applied to Elium resin. Three levels of recycling were carried out on the initial material. The recycled specimens were investigated and tested by means of tensile tests. Also, the acoustic emission (AE) technique was used to characterize microstructural damage events leading to overall failure of the recycled Elium. This study has been further supported by scanning electron microscopy (SEM) micrographs of the fractured face. The results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling operations. Conversely, recycling induces a rise in the elastic modulus. Also, the acoustic emission technique associated with SEM observation showed two classes of damage mechanisms. A first “class A” related to “matrix cracking” and a second “class B” associated to matrix/matrix friction.

Research paper thumbnail of Manufacturing of Sandwich Structure with Recycled Flax/Elium Skins

Lecture notes in mechanical engineering, Sep 21, 2021

Research paper thumbnail of Integrated health monitoring of unidirectional bio-composites

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2019

Research paper thumbnail of Integration of Piezoelectric Sensors in Biocomposite Materials for Structural Health Monitoring by Acoustic Emission

HAL (Le Centre pour la Communication Scientifique Directe), Apr 11, 2022

Research paper thumbnail of In-situ health monitoring of thermoplastic bio-composites using acoustic emission

Journal of Thermoplastic Composite Materials

This article aims to accomplish research’s that has been achieved recently in the scientific comm... more This article aims to accomplish research’s that has been achieved recently in the scientific community on the manufacturing monitoring and structural health monitoring (SHM) of composite materials using in-situ piezoelectric sensors. A series of specimens of flax/Elium composite laminates with and without integrated piezoelectric sensors were subject to static and fatigue tensile tests. The effects of introducing the sensor into the composite materials were studied. Moreover, the Acoustic Emission (AE) method was used during experimental tests to follow the gradual degradation and damage evolution in the bio-composites. The AE data were analyzed by the k-means unsupervised pattern recognition algorithm. Moreover, the characteristics of the acoustic signals detected from specimens with and without integrated sensors were compared. The experimental results show that the integration of piezoelectric sensors within the flax/Elium composite without degrading its mechanical properties is ...

Research paper thumbnail of Integrated health monitoring of unidirectional bio-composites

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2019

Research paper thumbnail of Experimental studies of mechanical behavior and damage mechanisms of recycled flax/Elium thermoplastic composite

Polymers and Polymer Composites

The aim of this study is to investigate the effects of recycling on the mechanical properties of ... more The aim of this study is to investigate the effects of recycling on the mechanical properties of Elium resin reinforced by flax fibers. A thermocompression recycling process is investigated and applied to production waste of thermoplastic composites. Five recycling operations are carried out on the initial material. Specimens are tested under static and fatigue tensile tests. In addition, the acoustic emission technique is used to identify damage mechanisms evolution during mechanical tests. Recorded events are post processed by the k-means unsupervised pattern recognition algorithm. The classes of acoustic emissions obtained are correlated with scanning electron microscopy observations to justify the existence of damage mechanisms detected. Results of static tests show that the ultimate tensile properties of the composites studied decrease with recycling operations. However, an increase in the elastic modulus is reported. In the fatigue tests, results show that stiffness, hysteresi...

Research paper thumbnail of Thermoplastic Elium Recycling: Mechanical Behaviour and Damage Mechanisms Analysis by Acoustic Emission

Applied Condition Monitoring, 2021

This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’... more This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’s the first liquid thermoplastic resin that provides the production of composite materials with an interesting mechanical behavior. Until now, its recyclable character is unjustified. It appeared on the resin market in 2014. But until now, no studies were available concerning how it can be recycled and reused. For this study, a thermocompression recycling process was investigated and applied to Elium resin. Three levels of recycling were carried out on the initial material. The recycled specimens were investigated and tested by means of tensile tests. Also, the acoustic emission (AE) technique was used to characterize microstructural damage events leading to overall failure of the recycled Elium. This study has been further supported by scanning electron microscopy (SEM) micrographs of the fractured face. The results obtained show that the failure tensile properties of Elium resin as well as flax fiber reinforced composites decrease during recycling operations. Conversely, recycling induces a rise in the elastic modulus. Also, the acoustic emission technique associated with SEM observation showed two classes of damage mechanisms. A first “class A” related to “matrix cracking” and a second “class B” associated to matrix/matrix friction.

Research paper thumbnail of Thermoplastic Elium Recycling: Mechanical Behaviour and Damage Mechanisms Analysis by Acoustic Emission

This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’... more This study aims to prove the recyclability of an innovative thermoplastic called Elium resin. It’s the first liquid thermoplastic resin that provides the production of composite materials with an interesting mechanical behavior. Until now, its recyclable character is unjustified. It appeared on the resin market in 2014. But until now, no studies were available concerning how it can be recycled and reused. For this study, a thermocompression recycling process was investigated and applied to Elium resin. Three levels of recycling were carried out on the initial material. The recycled specimens were investigated and tested by means of tensile tests. Also, the acoustic emission (AE) technique was used to characterize microstructural damage events leading to overall failure of the recycled Elium. This study has been further supported by scanning electron microscopy (SEM) micrographs of the fractured face. The results obtained show that the failure tensile properties of Elium resin as wel...

Research paper thumbnail of Manufacturing of Sandwich Structure with Recycled Flax/Elium Skins

Lecture Notes in Mechanical Engineering, 2021

Research paper thumbnail of Effect of Recycling Cycles on the Mechanical and Damping Properties of Flax Fibre Reinforced Elium Composite: Experimental and Numerical Studies

Journal of Renewable Materials, 2021