The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

Christophe Cluzel - One of the best experts on this subject based on the ideXlab platform.

  • The Climbing Drum Peel Test: An alternative to the Double Cantilever Beam for the determination of fracture toughness of monolithic laminates
    Composites Part A-applied Science and Manufacturing, 2015
    Co-Authors: Federica Daghia, Christophe Cluzel
    Abstract:

    The experimental determination of the fracture toughness of inter-ply interfaces in monolithic composite specimens is far from trivial: even in standard test methods such as the Double Cantilever Beam (DCB), some precautions must be taken in the choice of the test configurations and in the post-treatment of the experimental results. Furthermore, non standard measurements such as the crack tip position during propagation are generally required. In this paper, we investigate an alternative test configuration, the Climbing Drum Peel (CDP) test, classically used in the ‘adhesives’ community. The adaptation of the CDP specimen configurations to the testing of monolithic composites is discussed and a systematic comparison is carried out between the CDP and the DCB tests in terms of global and local indicators of the crack propagation behavior.

  • Evaluation of the Climbing Drum Peel (CDP) test for the determination of the mode I fracture toughness of monolithic laminated composite specimens
    2015
    Co-Authors: Federica Daghia, Christophe Cluzel
    Abstract:

    The inter-laminar fracture toughness is a measure of the delamination resistance of a laminated composite system. Its rigorous experimental evaluation requires a number of precautions in the choice of the test setup and post-treatment. In this paper, we consider two different tests for the mode I fracture toughness: the classical Double Cantilever Beam (DCB) test and the Climbing Drum Peel (CDP) test, which is standard in the "adhesives" community and which is first applied here to monolithic composite specimens. The two tests are compared in terms of setup, post-treatment and results on different types of specimens. The CDP appears to have a number of advantages over the DCB, and thus it represents an interesting alternative for the determination of the mode I fracture toughness.

  • essai de delaminage en mode i sur composites monolithiques double cantilever beam versus Climbing Drum Peel
    Comptes-rendus des JNC19, 2015
    Co-Authors: Federica Daghia, Christophe Cluzel
    Abstract:

    L'evaluation rigoureuse de la tenacite des interfaces interlaminaires des composites monolithiques requiere des precautions dans les choix de la configuration d'essai et de la methode de post-traitement. Dans ce travail, la configuration classique de mode I, le Double Cantilever Beam (DCB), est comparee a la configuration de tambour grimpant (Climbing Drum Peel, CDP), issue de la communaute des "adhesifs". Les nombreux avantages du CDP par rapport au DCB sont discutes. La comparaison des resultats des deux essais pour des differents types d'echantillon en termes d'indicateurs globaux et locaux permet de definir le CDP comme une alternative interessante au DCB pour la determination de la tenacite en mode I des composites monolithiques.

Federica Daghia - One of the best experts on this subject based on the ideXlab platform.

  • The Climbing Drum Peel Test: An alternative to the Double Cantilever Beam for the determination of fracture toughness of monolithic laminates
    Composites Part A-applied Science and Manufacturing, 2015
    Co-Authors: Federica Daghia, Christophe Cluzel
    Abstract:

    The experimental determination of the fracture toughness of inter-ply interfaces in monolithic composite specimens is far from trivial: even in standard test methods such as the Double Cantilever Beam (DCB), some precautions must be taken in the choice of the test configurations and in the post-treatment of the experimental results. Furthermore, non standard measurements such as the crack tip position during propagation are generally required. In this paper, we investigate an alternative test configuration, the Climbing Drum Peel (CDP) test, classically used in the ‘adhesives’ community. The adaptation of the CDP specimen configurations to the testing of monolithic composites is discussed and a systematic comparison is carried out between the CDP and the DCB tests in terms of global and local indicators of the crack propagation behavior.

  • Evaluation of the Climbing Drum Peel (CDP) test for the determination of the mode I fracture toughness of monolithic laminated composite specimens
    2015
    Co-Authors: Federica Daghia, Christophe Cluzel
    Abstract:

    The inter-laminar fracture toughness is a measure of the delamination resistance of a laminated composite system. Its rigorous experimental evaluation requires a number of precautions in the choice of the test setup and post-treatment. In this paper, we consider two different tests for the mode I fracture toughness: the classical Double Cantilever Beam (DCB) test and the Climbing Drum Peel (CDP) test, which is standard in the "adhesives" community and which is first applied here to monolithic composite specimens. The two tests are compared in terms of setup, post-treatment and results on different types of specimens. The CDP appears to have a number of advantages over the DCB, and thus it represents an interesting alternative for the determination of the mode I fracture toughness.

  • essai de delaminage en mode i sur composites monolithiques double cantilever beam versus Climbing Drum Peel
    Comptes-rendus des JNC19, 2015
    Co-Authors: Federica Daghia, Christophe Cluzel
    Abstract:

    L'evaluation rigoureuse de la tenacite des interfaces interlaminaires des composites monolithiques requiere des precautions dans les choix de la configuration d'essai et de la methode de post-traitement. Dans ce travail, la configuration classique de mode I, le Double Cantilever Beam (DCB), est comparee a la configuration de tambour grimpant (Climbing Drum Peel, CDP), issue de la communaute des "adhesifs". Les nombreux avantages du CDP par rapport au DCB sont discutes. La comparaison des resultats des deux essais pour des differents types d'echantillon en termes d'indicateurs globaux et locaux permet de definir le CDP comme une alternative interessante au DCB pour la determination de la tenacite en mode I des composites monolithiques.

Cluzel Christophe - One of the best experts on this subject based on the ideXlab platform.

  • Non-conventional approaches to measure 
the delamination fracture toughness:
 the example of the Double Drum Peel test
    HAL CCSD, 2020
    Co-Authors: Daghia Federica, Cluzel Christophe, Courtemanche Benoit
    Abstract:

    International audienceCantilever Beam, End Notched Flexure, ...) involve flat, unidirectional specimens with an initial delamination within the mid-plane, which enable one to easily control the mode mixity at the crack tip. Many real-life structures, however, such as non-symmetric stacking sequences, sandwich panels or curved structures, do not correspond to this description. Forthese kinds of specimens, alternative testing configurations are required in order to characterize the delamination fracture toughness while remaining close to the geometry and manufacturing conditions of the real part.Different examples of non-conventional testing approaches, derived from the adhesives’ community and already investigated by the authors [1,2], are illustrated in this work, with a particular focus on the new Double Drum Peel (DDP) test configuration. The DDP was originally conceived by the Cetim in order to investigate the link between the manufacturing parameters and the quality of the interface thermoplastic matrix composites manufactured by Laser Assisted Tape Placement (LATP), and it is here reinterpreted as a delamination test. In all of the considered approaches, a global energy balance enables one to quantify the energy associated to interface delamination, eventually accounting for energy losses in other portions of the structure. As pure-mode loading conditions cannot be applied easily to a general test configuration, the loading conditions seen by the propagating crack need to be characterized. Some DDP test on thermoset and thermoplastic matrix composites are performed in order to assess the potential of this testing method.A more physics-based link between the loading conditions seen by the propagating crack and the measured fracture toughness constitutes a perspective of this work.References:[1] F. Daghia and C. Cluzel, The Climbing Drum Peel (CDP) test: an alternative to the Double Cantilever Beam (DCB) for the determination of fracture toughness of monolithic laminates, Composites: Part A 78(2015):70-83.[2] F. Daghia, C. Cluzel, L. Hébrard, F. Churlaud, B. Courtemanche, The Double Drum Peel (DDP) test: a new concept to evaluate the delamination fracture toughness of cylindrical laminates, Composites: Part A 113(2018):83-94

  • Essai de délaminage en mode I sur composites monolithiques: Double Cantilever Beam versus Climbing Drum Peel
    HAL CCSD, 2015
    Co-Authors: Daghia Federica, Cluzel Christophe
    Abstract:

    National audienceL'évaluation rigoureuse de la ténacité des interfaces interlaminaires des composites monolithiques requière des précautions dans les choix de la configuration d'essai et de la méthode de post-traitement. Dans ce travail, la configuration classique de mode I, le Double Cantilever Beam (DCB), est comparée à la configuration de tambour grimpant (Climbing Drum Peel, CDP), issue de la communauté des "adhésifs". Les nombreux avantages du CDP par rapport au DCB sont discutés. La comparaison des résultats des deux essais pour des différents types d'échantillon en termes d'indicateurs globaux et locaux permet de définir le CDP comme une alternative intéressante au DCB pour la détermination de la ténacité en mode I des composites monolithiques

  • The Climbing Drum Peel test: an alternative to the Double Cantilever Beam for the determination of fracture toughness of monolithic laminates
    'Elsevier BV', 2015
    Co-Authors: Daghia Federica, Cluzel Christophe
    Abstract:

    International audienceThe experimental determination of the fracture toughness of inter-ply interfaces in monolithic composite specimens is far from trivial: even in standard test methods such as the Double Cantilever Beam (DCB), some precautions must be taken in the choice of the test configurations and in the post-treatment of the experimental results. Furthermore, non standard measurements such as the crack tip position during propagation are generally required. In this paper, we investigate an alternative test configuration, the Climbing Drum Peel (CDP) test, classically used in the ‘adhesives’ community. The adaptation of the CDP specimen configurations to the testing of monolithic composites is discussed and a systematic comparison is carried out between the CDP and the DCB tests in terms of global and local indicators of the crack propagation behavior

  • Evaluation of the Climbing Drum Peel (CDP) test for the determination of the mode I fracture toughness of monolithic laminated composite specimens
    HAL CCSD, 2015
    Co-Authors: Daghia Federica, Cluzel Christophe
    Abstract:

    International audienceThe inter-laminar fracture toughness is a measure of the delamination resistance of a laminated composite system. Its rigorous experimental evaluation requires a number of precautions in the choice of the test setup and post-treatment. In this paper, we consider two different tests for the mode I fracture toughness: the classical Double Cantilever Beam (DCB) test and the Climbing Drum Peel (CDP) test, which is standard in the "adhesives" community and which is first applied here to monolithic composite specimens. The two tests are compared in terms of setup, post-treatment and results on different types of specimens. The CDP appears to have a number of advantages over the DCB, and thus it represents an interesting alternative for the determination of the mode I fracture toughness

  • Durability and thermo-oxidation behaviour of organic matrix composite materials at high temperatures
    HAL CCSD, 2015
    Co-Authors: Cinquin Jacques, Daghia Federica, Cluzel Christophe, Colin Xavier, Fayolle Bruno, Grandidier Jean-claude, Lafarie-frenot Marie-christine, Minervino Matteo, Ladevèze Pierre, Zhang Fangzhou
    Abstract:

    International audienceThis paper introduces a review of the main activities carried out within the context of the ‘COMPTINN’ research program, for the activities focusing on the durability and thermo-oxidation behaviour of organic matrix composite materials at ‘high’ temperatures (120°C-180°C). The scientific aim of ‘COMPTINN’ research program was to better identify, with a multi-scale approach, the link between durability, accelerating ageing factors and physical mechanisms involved in thermo-oxidation phenomena, and to provide theoretical and numerical tools for predicting the mechanical behaviour of aged composite materials including damage onset and development. Work has been carried out on continuous carbon fibre composite with epoxy matrix. The influence of thermo oxidation on the mechanical behaviour of the matrix, the creep properties and durability of the composite, has been identified with ultra-micro indentation (UMI). Based on the evolution of the elastic indentation modulus of the resin in the thickness of a sample exposed to oxidative environment at 150°C for different durations, we have clearly validated that the thickness of the oxidised layer is linked with the exposed time. Another innovative experimental technique has also been used: a Climbing Drum Peel test has been modified to investigate the influence of oxygen on mode I delamination propagation in a composite laminate. In this test, crack propagation is driven by oxidation under constant mechanical energy and the delamination propagation speed can be linked with the oxidation level. This enables one to identify the critical strain energy release rate associated with an oxidized interface and to predict the interaction between mechanical and environmental loadings. Thermo-oxidation is identified as the result of oxygen diffusion and oxygen reaction with the molecular structure of the resin. The predominance of chain scissions over crosslinking leads to a decrease in the glass transition temperature combined with an increase in the Young’s modulus at room temperature (called “antiplasticization” effect). This process is also at the origin of matrix shrinkage, weight loss and cracks initiation

Daghia Federica - One of the best experts on this subject based on the ideXlab platform.

  • Non-conventional approaches to measure 
the delamination fracture toughness:
 the example of the Double Drum Peel test
    HAL CCSD, 2020
    Co-Authors: Daghia Federica, Cluzel Christophe, Courtemanche Benoit
    Abstract:

    International audienceCantilever Beam, End Notched Flexure, ...) involve flat, unidirectional specimens with an initial delamination within the mid-plane, which enable one to easily control the mode mixity at the crack tip. Many real-life structures, however, such as non-symmetric stacking sequences, sandwich panels or curved structures, do not correspond to this description. Forthese kinds of specimens, alternative testing configurations are required in order to characterize the delamination fracture toughness while remaining close to the geometry and manufacturing conditions of the real part.Different examples of non-conventional testing approaches, derived from the adhesives’ community and already investigated by the authors [1,2], are illustrated in this work, with a particular focus on the new Double Drum Peel (DDP) test configuration. The DDP was originally conceived by the Cetim in order to investigate the link between the manufacturing parameters and the quality of the interface thermoplastic matrix composites manufactured by Laser Assisted Tape Placement (LATP), and it is here reinterpreted as a delamination test. In all of the considered approaches, a global energy balance enables one to quantify the energy associated to interface delamination, eventually accounting for energy losses in other portions of the structure. As pure-mode loading conditions cannot be applied easily to a general test configuration, the loading conditions seen by the propagating crack need to be characterized. Some DDP test on thermoset and thermoplastic matrix composites are performed in order to assess the potential of this testing method.A more physics-based link between the loading conditions seen by the propagating crack and the measured fracture toughness constitutes a perspective of this work.References:[1] F. Daghia and C. Cluzel, The Climbing Drum Peel (CDP) test: an alternative to the Double Cantilever Beam (DCB) for the determination of fracture toughness of monolithic laminates, Composites: Part A 78(2015):70-83.[2] F. Daghia, C. Cluzel, L. Hébrard, F. Churlaud, B. Courtemanche, The Double Drum Peel (DDP) test: a new concept to evaluate the delamination fracture toughness of cylindrical laminates, Composites: Part A 113(2018):83-94

  • Essai de délaminage en mode I sur composites monolithiques: Double Cantilever Beam versus Climbing Drum Peel
    HAL CCSD, 2015
    Co-Authors: Daghia Federica, Cluzel Christophe
    Abstract:

    National audienceL'évaluation rigoureuse de la ténacité des interfaces interlaminaires des composites monolithiques requière des précautions dans les choix de la configuration d'essai et de la méthode de post-traitement. Dans ce travail, la configuration classique de mode I, le Double Cantilever Beam (DCB), est comparée à la configuration de tambour grimpant (Climbing Drum Peel, CDP), issue de la communauté des "adhésifs". Les nombreux avantages du CDP par rapport au DCB sont discutés. La comparaison des résultats des deux essais pour des différents types d'échantillon en termes d'indicateurs globaux et locaux permet de définir le CDP comme une alternative intéressante au DCB pour la détermination de la ténacité en mode I des composites monolithiques

  • The Climbing Drum Peel test: an alternative to the Double Cantilever Beam for the determination of fracture toughness of monolithic laminates
    'Elsevier BV', 2015
    Co-Authors: Daghia Federica, Cluzel Christophe
    Abstract:

    International audienceThe experimental determination of the fracture toughness of inter-ply interfaces in monolithic composite specimens is far from trivial: even in standard test methods such as the Double Cantilever Beam (DCB), some precautions must be taken in the choice of the test configurations and in the post-treatment of the experimental results. Furthermore, non standard measurements such as the crack tip position during propagation are generally required. In this paper, we investigate an alternative test configuration, the Climbing Drum Peel (CDP) test, classically used in the ‘adhesives’ community. The adaptation of the CDP specimen configurations to the testing of monolithic composites is discussed and a systematic comparison is carried out between the CDP and the DCB tests in terms of global and local indicators of the crack propagation behavior

  • Evaluation of the Climbing Drum Peel (CDP) test for the determination of the mode I fracture toughness of monolithic laminated composite specimens
    HAL CCSD, 2015
    Co-Authors: Daghia Federica, Cluzel Christophe
    Abstract:

    International audienceThe inter-laminar fracture toughness is a measure of the delamination resistance of a laminated composite system. Its rigorous experimental evaluation requires a number of precautions in the choice of the test setup and post-treatment. In this paper, we consider two different tests for the mode I fracture toughness: the classical Double Cantilever Beam (DCB) test and the Climbing Drum Peel (CDP) test, which is standard in the "adhesives" community and which is first applied here to monolithic composite specimens. The two tests are compared in terms of setup, post-treatment and results on different types of specimens. The CDP appears to have a number of advantages over the DCB, and thus it represents an interesting alternative for the determination of the mode I fracture toughness

  • Durability and thermo-oxidation behaviour of organic matrix composite materials at high temperatures
    HAL CCSD, 2015
    Co-Authors: Cinquin Jacques, Daghia Federica, Cluzel Christophe, Colin Xavier, Fayolle Bruno, Grandidier Jean-claude, Lafarie-frenot Marie-christine, Minervino Matteo, Ladevèze Pierre, Zhang Fangzhou
    Abstract:

    International audienceThis paper introduces a review of the main activities carried out within the context of the ‘COMPTINN’ research program, for the activities focusing on the durability and thermo-oxidation behaviour of organic matrix composite materials at ‘high’ temperatures (120°C-180°C). The scientific aim of ‘COMPTINN’ research program was to better identify, with a multi-scale approach, the link between durability, accelerating ageing factors and physical mechanisms involved in thermo-oxidation phenomena, and to provide theoretical and numerical tools for predicting the mechanical behaviour of aged composite materials including damage onset and development. Work has been carried out on continuous carbon fibre composite with epoxy matrix. The influence of thermo oxidation on the mechanical behaviour of the matrix, the creep properties and durability of the composite, has been identified with ultra-micro indentation (UMI). Based on the evolution of the elastic indentation modulus of the resin in the thickness of a sample exposed to oxidative environment at 150°C for different durations, we have clearly validated that the thickness of the oxidised layer is linked with the exposed time. Another innovative experimental technique has also been used: a Climbing Drum Peel test has been modified to investigate the influence of oxygen on mode I delamination propagation in a composite laminate. In this test, crack propagation is driven by oxidation under constant mechanical energy and the delamination propagation speed can be linked with the oxidation level. This enables one to identify the critical strain energy release rate associated with an oxidized interface and to predict the interaction between mechanical and environmental loadings. Thermo-oxidation is identified as the result of oxygen diffusion and oxygen reaction with the molecular structure of the resin. The predominance of chain scissions over crosslinking leads to a decrease in the glass transition temperature combined with an increase in the Young’s modulus at room temperature (called “antiplasticization” effect). This process is also at the origin of matrix shrinkage, weight loss and cracks initiation

Yong Hoon Jang - One of the best experts on this subject based on the ideXlab platform.

  • bondline strength evaluation of cocure precured honeycomb sandwich structures under aircraft hygro and repair environments
    Composites Part A-applied Science and Manufacturing, 2010
    Co-Authors: Heung Soap Choi, Yong Hoon Jang
    Abstract:

    Abstract Effects of moisture accumulated into the adhesively bonded composite structures on their bondline mechanical strengths are investigated through a series of comparative experiments. Those composite structures include a honeycomb sandwich structures fabricated by the cocure and the precure processes. Mass of moisture accumulated into the closed cells of the honeycomb sandwich panel specimens has been calculated. A pressure due to the vapor expansion in each cell of the sandwich panel has also been obtained for the minimum repair pressure to be applied to the laminate patched area by vapor pressure–temperature relations from the thermodynamic steam table, the ideal gas state equation and two vapor pressure equations. The bondline strengths of the laminated skins on the flat surface of honeycomb have been compared by the flatwise tension test and Climbing Drum Peel test for dry, wet and repair-after-wet specimens, respectively.