In this research, we made physical and mechanical analyses thanks to which we deduced that the potential of replacing the Portland cement up to 20% by modernite-rich tuff (TM) and limestone filler (LF). The experimental procedure was done in two main stages. The first stage was dedicated to the pastes, including water requirement, setting time, hydration heat and free Ca(OH)2 content. In the second stage, mechanical and physical properties of mortars, water porosity and pore size distribution were studied. The final results show that LF mixtures closest to the control mixtures unlike the MT mixtures which exhibited a high water demand, less free Ca(OH)2, rapid appearance of the maximum thermal effect, an increase in the total and water accessible porosity, there is also a delay in improving of strength.
{"title":"Physical and mechanical studies on binary blended Portland cements containing mordenite-rich tuff and limestone filler","authors":"M. Meziani, N. Leklou, O. Amiri, N. Chelouah","doi":"10.1051/MATTECH/2019021","DOIUrl":"https://doi.org/10.1051/MATTECH/2019021","url":null,"abstract":"In this research, we made physical and mechanical analyses thanks to which we deduced that the potential of replacing the Portland cement up to 20% by modernite-rich tuff (TM) and limestone filler (LF). The experimental procedure was done in two main stages. The first stage was dedicated to the pastes, including water requirement, setting time, hydration heat and free Ca(OH)2 content. In the second stage, mechanical and physical properties of mortars, water porosity and pore size distribution were studied. The final results show that LF mixtures closest to the control mixtures unlike the MT mixtures which exhibited a high water demand, less free Ca(OH)2, rapid appearance of the maximum thermal effect, an increase in the total and water accessible porosity, there is also a delay in improving of strength.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44412304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mehena Oualit, Y. Mélinge, R. Jauberthie, M. Abadlia
Technologiquement, le réseau d’assainissement à base cimentaire est de constitutions diverses et la mise en œuvre de matériaux de plus en plus performants contribue à une meilleure durabilité. Or, si aujourd’hui, il est aisé d’identifier des états de référence, quant aux propriétés des matériaux et des ouvrages tant sur le plan physique, chimique, mécanique…, la mise en évidence de ces états de références s’avère délicate pour les structures et formulations anciennes. L’objectif de cet article est d’étudier la durabilité des réseaux d’assainissement de la ville de Rennes (France) constitués de conduites à base cimentaire. Des données relatives aux caractéristiques des conduites ont été collectées (type du réseau, diamètre, épaisseur, date de mise en place…) pour chaque tronçon étudié. En plus de la qualité apparente des prélèvements, des essais de caractérisation ont été réalisés sur des éprouvettes cylindriques carottées tels que la masse volumique, la porosité et la résistance ultime en compression. Les résultats des analyses sont recensés et discutés et des corrélations sont établies pour expliquer l’évolution des propriétés des matériaux et évaluer la cinétique d’altération. Cette investigation est réalisée dans l’optique de pouvoir envisager les opérations de maintenance dans une logique de prévention et non consécutive à un accident.
{"title":"Durabilité des bétons des réseaux d’assainissement urbain","authors":"Mehena Oualit, Y. Mélinge, R. Jauberthie, M. Abadlia","doi":"10.1051/MATTECH/2019017","DOIUrl":"https://doi.org/10.1051/MATTECH/2019017","url":null,"abstract":"Technologiquement, le réseau d’assainissement à base cimentaire est de constitutions diverses et la mise en œuvre de matériaux de plus en plus performants contribue à une meilleure durabilité. Or, si aujourd’hui, il est aisé d’identifier des états de référence, quant aux propriétés des matériaux et des ouvrages tant sur le plan physique, chimique, mécanique…, la mise en évidence de ces états de références s’avère délicate pour les structures et formulations anciennes. L’objectif de cet article est d’étudier la durabilité des réseaux d’assainissement de la ville de Rennes (France) constitués de conduites à base cimentaire. Des données relatives aux caractéristiques des conduites ont été collectées (type du réseau, diamètre, épaisseur, date de mise en place…) pour chaque tronçon étudié. En plus de la qualité apparente des prélèvements, des essais de caractérisation ont été réalisés sur des éprouvettes cylindriques carottées tels que la masse volumique, la porosité et la résistance ultime en compression. Les résultats des analyses sont recensés et discutés et des corrélations sont établies pour expliquer l’évolution des propriétés des matériaux et évaluer la cinétique d’altération. Cette investigation est réalisée dans l’optique de pouvoir envisager les opérations de maintenance dans une logique de prévention et non consécutive à un accident.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44074077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. boudiaf, K. Boubendira, K. Harrar, A. Saadoune, H. Ghodbane, Amine Dahane, Oussama Messai
The quality control of steel products by human vision remains tedious, fatiguing, somewhat fast, rather robust, sketchy, dangerous or impossible. For these reasons, the use of the artificial vision in the world of quality control has become more than necessary. However, these images are often large in terms of quantity and size, which becomes a problem in quality control centers, where engineers are unable to store these images. For this, efficient compression techniques are necessary for archiving and transmitting the images. The reduction in file size allows more images to be stored in a disk or memory space. The present paper proposes an effective technique for redundancy extraction using the Principal Component Analysis (PCA) approach. Furthermore, it aims to study the effects of the number of eigenvectors employed in the PCA compression technique on the quality of the compressed image. The results revealed that using only 25% of the eigenvectors provide very similar compressed images compared to the original ones, in terms of quality. These images are characterized by high compression ratios and a small storage space.
{"title":"Image compression of surface defects of the hot-rolled steel strip using Principal Component Analysis","authors":"A. boudiaf, K. Boubendira, K. Harrar, A. Saadoune, H. Ghodbane, Amine Dahane, Oussama Messai","doi":"10.1051/MATTECH/2019012","DOIUrl":"https://doi.org/10.1051/MATTECH/2019012","url":null,"abstract":"The quality control of steel products by human vision remains tedious, fatiguing, somewhat fast, rather robust, sketchy, dangerous or impossible. For these reasons, the use of the artificial vision in the world of quality control has become more than necessary. However, these images are often large in terms of quantity and size, which becomes a problem in quality control centers, where engineers are unable to store these images. For this, efficient compression techniques are necessary for archiving and transmitting the images. The reduction in file size allows more images to be stored in a disk or memory space. The present paper proposes an effective technique for redundancy extraction using the Principal Component Analysis (PCA) approach. Furthermore, it aims to study the effects of the number of eigenvectors employed in the PCA compression technique on the quality of the compressed image. The results revealed that using only 25% of the eigenvectors provide very similar compressed images compared to the original ones, in terms of quality. These images are characterized by high compression ratios and a small storage space.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41622094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Saïcha Gerbinet, F. V. Stappen, Sandra Belboom, Eric Pezennec, Angélique Léonard
This paper focuses on potential errors when assessing the human toxicity of corn farming in Wallonia, Belgium. The USEtox method is applied to the farming of 1 hectare of corn. Local data are used for farming data and GaBi datasets for background data. Field emissions due to farming are calculated by the most prevailing models. The results in human toxicity, cancer effect, underline the large contribution of chromium (Cr) emissions. But when characterizing fertilizer composition, only the total chromium is measured and therefore unspecified chromium is used as emissions. However, it is known that chromium in the natural environment is mostly the non-toxic form Cr (III), which would greatly decrease the impact as the characterization factor for unspecified chromium is, in USEtox, the average of Cr (III) and the toxic form Cr (VI). The impact for human toxicity, non-cancer effect is mostly related to zinc emissions even if zinc is relatively harmless. The impact of pesticides is negligible in both cases. These results show that caution must be taken when examining/interpreting toxicity categories.
{"title":"Impact of heavy metals on human toxicity using LCA: The case study of Walloon corn","authors":"Saïcha Gerbinet, F. V. Stappen, Sandra Belboom, Eric Pezennec, Angélique Léonard","doi":"10.1051/MATTECH/2019010","DOIUrl":"https://doi.org/10.1051/MATTECH/2019010","url":null,"abstract":"This paper focuses on potential errors when assessing the human toxicity of corn farming in Wallonia, Belgium. The USEtox method is applied to the farming of 1 hectare of corn. Local data are used for farming data and GaBi datasets for background data. Field emissions due to farming are calculated by the most prevailing models. The results in human toxicity, cancer effect, underline the large contribution of chromium (Cr) emissions. But when characterizing fertilizer composition, only the total chromium is measured and therefore unspecified chromium is used as emissions. However, it is known that chromium in the natural environment is mostly the non-toxic form Cr (III), which would greatly decrease the impact as the characterization factor for unspecified chromium is, in USEtox, the average of Cr (III) and the toxic form Cr (VI). The impact for human toxicity, non-cancer effect is mostly related to zinc emissions even if zinc is relatively harmless. The impact of pesticides is negligible in both cases. These results show that caution must be taken when examining/interpreting toxicity categories.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43131820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The main goal in the advancement of composites with an aluminum metal matrix is to provide high performance and better mechanical properties from the currently available materials. Aluminium metal composite (AMC) can be researched and used in many industrial applications, such as manufacturing, aerospace, defense, pipelines and the automotive industry. The production of AMC is only possible with help of a suitable die in solid route of powder metallurgy process. Thus, the design of die is most important step in the process of powder metallurgy. The shape, size and design of the die directly influence the final AMC product. A number of steps and considerations like stress concentration and the propagation of cracks should be made for designing the die before its manufacture. The present work is made to attempt the fabrication and design of a cold compaction die with EN 10083 steel used for powder metallurgy process.
{"title":"Manufacture of die and their designing parameters for sintered AMC product","authors":"R. Behera, B. P. Samal, S. C. Panigrahi","doi":"10.1051/mattech/2020009","DOIUrl":"https://doi.org/10.1051/mattech/2020009","url":null,"abstract":"The main goal in the advancement of composites with an aluminum metal matrix is to provide high performance and better mechanical properties from the currently available materials. Aluminium metal composite (AMC) can be researched and used in many industrial applications, such as manufacturing, aerospace, defense, pipelines and the automotive industry. The production of AMC is only possible with help of a suitable die in solid route of powder metallurgy process. Thus, the design of die is most important step in the process of powder metallurgy. The shape, size and design of the die directly influence the final AMC product. A number of steps and considerations like stress concentration and the propagation of cracks should be made for designing the die before its manufacture. The present work is made to attempt the fabrication and design of a cold compaction die with EN 10083 steel used for powder metallurgy process.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57959909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Guéret, Gwenaël Diélie, Frédérique Bastin, Tiriana Segato, M. Verbanck, Pierre D'Ans
Grands émetteurs de gaz à effet de serre à la production, les matériaux de construction issus des filières thermiques peuvent être, dans certains cas, substitués par des « éco-matériaux ». L’économie circulaire pousse de plus en plus à intégrer des déchets dans les chaînes de production. Ce travail analyse la possibilité d’intégration de déchets urbains tel que des résidus fins de boues sédimentaires de dragage (BSD) pour partiellement remplacer la terre crue dans la production de briques en terre crue comprimée (BTCC). Les BSD ont été caractérisées par diffraction des rayons X, fluorescence X et analyse thermique. La présence de métaux lourds et composés organiques polluants a été quantifiée. Des pastilles de différentes teneurs en eau et compositions (mixte BSD et terres crues) ont été réalisées. Leur tenue à l’abrasion a été étudiée sur l’essai standardisé du pion-disque. Les pastilles contenant de la BSD dont les organiques ont été éliminés thermiquement, ont une faible tenue à l’abrasion. Cette performance est améliorée par l’ajout de 5 % de ciment, qui permet d’augmenter la cohésion du matériau.
{"title":"Influence de la substitution d’argile par des déchets sédimentaires dans des briques en terre crue comprimée (BTCC) sur la résistance à l’abrasion","authors":"S. Guéret, Gwenaël Diélie, Frédérique Bastin, Tiriana Segato, M. Verbanck, Pierre D'Ans","doi":"10.1051/MATTECH/2019018","DOIUrl":"https://doi.org/10.1051/MATTECH/2019018","url":null,"abstract":"Grands émetteurs de gaz à effet de serre à la production, les matériaux de construction issus des filières thermiques peuvent être, dans certains cas, substitués par des « éco-matériaux ». L’économie circulaire pousse de plus en plus à intégrer des déchets dans les chaînes de production. Ce travail analyse la possibilité d’intégration de déchets urbains tel que des résidus fins de boues sédimentaires de dragage (BSD) pour partiellement remplacer la terre crue dans la production de briques en terre crue comprimée (BTCC). Les BSD ont été caractérisées par diffraction des rayons X, fluorescence X et analyse thermique. La présence de métaux lourds et composés organiques polluants a été quantifiée. Des pastilles de différentes teneurs en eau et compositions (mixte BSD et terres crues) ont été réalisées. Leur tenue à l’abrasion a été étudiée sur l’essai standardisé du pion-disque. Les pastilles contenant de la BSD dont les organiques ont été éliminés thermiquement, ont une faible tenue à l’abrasion. Cette performance est améliorée par l’ajout de 5 % de ciment, qui permet d’augmenter la cohésion du matériau.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57959334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Nakajima, M. Matsumoto, H. Murakami, M. Hayakawa, Yasunari Matsuno, Wataru Takayanagi
Remanufacturing is an industrial process that turns used products into new ones with the same quality, functionality, and warranty as new products; it is a critical element for realizing a resource-efficient manufacturing industry and a circular economy. Remanufacturing may involve adding new and better functionality to used products, such as adding more wear-resistant materials to the surface or new sensor systems. Remanufacturing has been undertaken for products such as: automobile parts, machinery, photocopiers, single-use cameras, furniture, and turbine components, etc. It is generally superior to material recycling in terms of energy and material savings. Our project aims to develop technologies necessary for the promotion of remanufacturing and to establish a cooperative network related to remanufacturing. As technical development items, our aim is to develop methods to assess the reliability of parts/components, develop technologies to restore deteriorated metal surfaces of used products, introduce production management methods for remanufacturing, and design a circulation system to retain the added values of products. In this paper, we introduce an outline of the project and present some preliminary results. This paper shows the possibility to quantitatively evaluate the carbide distribution (size and density) of the carburized surface of a gear, and also shows the potential to repair materials exposed to a high-temperature oxidative atmosphere by Pr-Ir coating technology.
{"title":"Development of multi-value circulation based on remanufacturing","authors":"K. Nakajima, M. Matsumoto, H. Murakami, M. Hayakawa, Yasunari Matsuno, Wataru Takayanagi","doi":"10.1051/MATTECH/2018057","DOIUrl":"https://doi.org/10.1051/MATTECH/2018057","url":null,"abstract":"Remanufacturing is an industrial process that turns used products into new ones with the same quality, functionality, and warranty as new products; it is a critical element for realizing a resource-efficient manufacturing industry and a circular economy. Remanufacturing may involve adding new and better functionality to used products, such as adding more wear-resistant materials to the surface or new sensor systems. Remanufacturing has been undertaken for products such as: automobile parts, machinery, photocopiers, single-use cameras, furniture, and turbine components, etc. It is generally superior to material recycling in terms of energy and material savings. Our project aims to develop technologies necessary for the promotion of remanufacturing and to establish a cooperative network related to remanufacturing. As technical development items, our aim is to develop methods to assess the reliability of parts/components, develop technologies to restore deteriorated metal surfaces of used products, introduce production management methods for remanufacturing, and design a circulation system to retain the added values of products. In this paper, we introduce an outline of the project and present some preliminary results. This paper shows the possibility to quantitatively evaluate the carbide distribution (size and density) of the carburized surface of a gear, and also shows the potential to repair materials exposed to a high-temperature oxidative atmosphere by Pr-Ir coating technology.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57959531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The 12th edition of the Society and Materials conferences, SAM-12, took place in Metz, France from 23 to 24May, 2018. This special issue ofMatériaux et Techniques collects 9 papers presented during this meeting. These papers can be regarded as highlights of the conference, in as far as they deal with some of the main topics that were discussed during these two days. SAM conferences are dedicated to the exploration of the interdisciplinary boundaries related to materials and their connection with society, the environment and nature. They try to analyze how anthroposphere, biosphere and geosphere interact. They propose new approaches, new methodologies and act as a laboratory for new thinking in the area. One boundary between the spheres is related to Materials and Social Sciences and Humanities (SSH): – the paper by Jean-Pierre Birat explores the matter of environmental ethics, which is the contribution of ethics and philosophy for fleshing out the concepts of sustainable development, which the material community has adopted wholeheartedly, of the circular economy, of the responsibilities for pollution, of the nature of pollution, etc. [1]; – Michael Kohlgrüber et al. [2] discuss the topic of social innovation and show how impowering the future users of a new technology in the workplace to engage in process innovation accelerates its implementation and its timeto-market. It also speeds up the Social Life-Cycle of that particular innovation (the concept is defined in the previous paper).
第12届社会与材料会议SAM-12于2018年5月23日至24日在法国梅斯举行。这一期《matsamriaux et Techniques》特刊收录了本次会议上发表的9篇论文。这些论文可以被视为会议的亮点，因为它们涉及了这两天讨论的一些主要议题。SAM会议致力于探索与材料相关的跨学科边界及其与社会，环境和自然的联系。他们试图分析人类圈、生物圈和地圈是如何相互作用的。他们提出新方法、新方法，并充当该领域新思维的实验室。两个领域之间的一个边界与材料、社会科学和人文科学(SSH)有关:让-皮埃尔·比拉特(Jean-Pierre Birat)的论文探讨了环境伦理问题，这是伦理学和哲学对充实可持续发展概念的贡献，物质社会全心全意地采用了可持续发展概念，循环经济，污染的责任，污染的性质等。- Michael kohlgrber et al. b[2]讨论了社会创新的话题，并展示了如何赋予工作场所中新技术的未来用户参与流程创新的能力，从而加速了其实施和上市时间。它还加快了特定创新的社会生命周期(这个概念在前一篇文章中有定义)。
{"title":"Special issue of Matériaux et Techniques devoted to SAM-12","authors":"J. Birat","doi":"10.1051/MATTECH/2019015","DOIUrl":"https://doi.org/10.1051/MATTECH/2019015","url":null,"abstract":"The 12th edition of the Society and Materials conferences, SAM-12, took place in Metz, France from 23 to 24May, 2018. This special issue ofMatériaux et Techniques collects 9 papers presented during this meeting. These papers can be regarded as highlights of the conference, in as far as they deal with some of the main topics that were discussed during these two days. SAM conferences are dedicated to the exploration of the interdisciplinary boundaries related to materials and their connection with society, the environment and nature. They try to analyze how anthroposphere, biosphere and geosphere interact. They propose new approaches, new methodologies and act as a laboratory for new thinking in the area. One boundary between the spheres is related to Materials and Social Sciences and Humanities (SSH): – the paper by Jean-Pierre Birat explores the matter of environmental ethics, which is the contribution of ethics and philosophy for fleshing out the concepts of sustainable development, which the material community has adopted wholeheartedly, of the circular economy, of the responsibilities for pollution, of the nature of pollution, etc. [1]; – Michael Kohlgrüber et al. [2] discuss the topic of social innovation and show how impowering the future users of a new technology in the workplace to engage in process innovation accelerates its implementation and its timeto-market. It also speeds up the Social Life-Cycle of that particular innovation (the concept is defined in the previous paper).","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57959277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article aims to understand better the mechanical properties and behavior of organic matrix composite materials under elevated temperature conditions. Two specific specimens of cured RTM6 epoxy resin are tested with DMA analysis: one being unaged and the other one aged for 5000 h at 130 °C under ambient air. Anti-plasticization effects seem to occur on aged resin. Series of nano-indentation tests are carried out from the surface to the core of the sample so as to measure gradient properties of the resin, at temperatures up to 150 °C using a high temperature indentation machine prototype. Thermo-oxidation phenomena involve oxidized layer formation during thermal ageing of the epoxy resin which is characterized through measurements of indentation Young’s modulus. After aged treatment, the variation of Young’s modulus of the oxidized layer at the surface of the sample is not clearly affected by the increasing test temperature whereas Young’s modulus of the core of the sample is decreasing significantly with the temperature test as on unaged epoxy resin. Thus, asymptotic growing of the oxidized layer is then confirmed.
{"title":"Characterization of the ageing of an epoxy resin using high temperature nanoindentation","authors":"B. Passilly, R. Delannoy","doi":"10.1051/MATTECH/2019004","DOIUrl":"https://doi.org/10.1051/MATTECH/2019004","url":null,"abstract":"This article aims to understand better the mechanical properties and behavior of organic matrix composite materials under elevated temperature conditions. Two specific specimens of cured RTM6 epoxy resin are tested with DMA analysis: one being unaged and the other one aged for 5000 h at 130 °C under ambient air. Anti-plasticization effects seem to occur on aged resin. Series of nano-indentation tests are carried out from the surface to the core of the sample so as to measure gradient properties of the resin, at temperatures up to 150 °C using a high temperature indentation machine prototype. Thermo-oxidation phenomena involve oxidized layer formation during thermal ageing of the epoxy resin which is characterized through measurements of indentation Young’s modulus. After aged treatment, the variation of Young’s modulus of the oxidized layer at the surface of the sample is not clearly affected by the increasing test temperature whereas Young’s modulus of the core of the sample is decreasing significantly with the temperature test as on unaged epoxy resin. Thus, asymptotic growing of the oxidized layer is then confirmed.","PeriodicalId":43816,"journal":{"name":"Materiaux & Techniques","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57959559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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