Ryuunosuke Minegishi, T. Ogasawara, T. Aoki, Y. Kubota, Y. Ishida
Phenylethynyl terminated polyimide “TriA-X” developed in Japan Aerospace Exploration Agency (JAXA) exhibits excellent mechanical properties with high glass transition temperature (> 350 °C), therefore it is suitable as matrix resin of high temperature composites. However, the time and temperature dependent mechanical properties have not been investigated. This study examined the mechanical behavior of unidirectional (UD) carbon fiber (CF)/ TriA-X polyimide composites by off-axis monotonic tensile tests and off-axis tensile creep tests. As results, it was revealed that one parameter plasticity model by Sun and Chen was effective to represent the nonlinear stress-strain behavior of UD-CF/ TriA-X composites. Furthermore, linear viscoelastic behavior was observed from the off-axis tensile creep tests of UD-CF/ TriA-X composites. On the other hand, residual strain was observed in creep recovery curves after unloading, which suggested that the creep and creep recovery behaviors of UDCF/ TriA-X composites are not affected only by viscoelastic and plastic deformation, but also by viscoplastic deformation.
{"title":"Time and Temperature Dependent Stress-Strain Behavior of Unidirectional Carbon Fiber/Polyimide Composites Under On-axis and Off-axis Tensile Loading","authors":"Ryuunosuke Minegishi, T. Ogasawara, T. Aoki, Y. Kubota, Y. Ishida","doi":"10.12783/ASC33/25961","DOIUrl":"https://doi.org/10.12783/ASC33/25961","url":null,"abstract":"Phenylethynyl terminated polyimide “TriA-X” developed in Japan Aerospace Exploration Agency (JAXA) exhibits excellent mechanical properties with high glass transition temperature (> 350 °C), therefore it is suitable as matrix resin of high temperature composites. However, the time and temperature dependent mechanical properties have not been investigated. This study examined the mechanical behavior of unidirectional (UD) carbon fiber (CF)/ TriA-X polyimide composites by off-axis monotonic tensile tests and off-axis tensile creep tests. As results, it was revealed that one parameter plasticity model by Sun and Chen was effective to represent the nonlinear stress-strain behavior of UD-CF/ TriA-X composites. Furthermore, linear viscoelastic behavior was observed from the off-axis tensile creep tests of UD-CF/ TriA-X composites. On the other hand, residual strain was observed in creep recovery curves after unloading, which suggested that the creep and creep recovery behaviors of UDCF/ TriA-X composites are not affected only by viscoelastic and plastic deformation, but also by viscoplastic deformation.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128649268","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}
Y. Xie, H. Kurita, Risa Honda, K. Katabira, F. Narita
It is required a joint technic with excellent mechanical properties to fabricate glass fiber reinforced plastic (GFRP) components. However, it is well-known that the mechanical jointing often causes the fracture of fiber reinforced plastics. It seems that the adhesive bonding is suitable to joint GFRPs, and it is necessary to develop an adhesive with outstanding mechanical properties. Recently, cellulose nanofibers (CNFs) have been obtained from plants by mechanical and chemical methods and it has been reported that CNFs have remarkable mechanical properties. In this study, we inserted epoxy resin with CNFs between GFRP and investigated its bending behavior, to estimate the capability of epoxy resin with CNFs as an adhesive for GFRPs. The flexural behavior and modulus of GFRP was similar regardless of the inserted part of epoxy resin with CNFs layer in GFRP. The flexural strength of GFRP was drastically increased (up to 600 MPa) by the insert of epoxy resin with CNFs of 5 or 10 wt.%, although that of GFRP was decreased by the insert of epoxy resin with CNFs of 25 wt.%. Therefore, it seems that the epoxy resin with CNFs is available as an adhesive for GFRP. However, it is required the observation of CNFs dispersion in epoxy resin to understand the strengthening mechanism of epoxy resin with CNFs.
{"title":"Fabrication of Cellulose Nanofiber/Glass Fiber-reinforced Composites and Their Bending Behavior Evaluation","authors":"Y. Xie, H. Kurita, Risa Honda, K. Katabira, F. Narita","doi":"10.12783/ASC33/26061","DOIUrl":"https://doi.org/10.12783/ASC33/26061","url":null,"abstract":"It is required a joint technic with excellent mechanical properties to fabricate glass fiber reinforced plastic (GFRP) components. However, it is well-known that the mechanical jointing often causes the fracture of fiber reinforced plastics. It seems that the adhesive bonding is suitable to joint GFRPs, and it is necessary to develop an adhesive with outstanding mechanical properties. Recently, cellulose nanofibers (CNFs) have been obtained from plants by mechanical and chemical methods and it has been reported that CNFs have remarkable mechanical properties. In this study, we inserted epoxy resin with CNFs between GFRP and investigated its bending behavior, to estimate the capability of epoxy resin with CNFs as an adhesive for GFRPs. The flexural behavior and modulus of GFRP was similar regardless of the inserted part of epoxy resin with CNFs layer in GFRP. The flexural strength of GFRP was drastically increased (up to 600 MPa) by the insert of epoxy resin with CNFs of 5 or 10 wt.%, although that of GFRP was decreased by the insert of epoxy resin with CNFs of 25 wt.%. Therefore, it seems that the epoxy resin with CNFs is available as an adhesive for GFRP. However, it is required the observation of CNFs dispersion in epoxy resin to understand the strengthening mechanism of epoxy resin with CNFs.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124582201","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}
{"title":"Experimental Investigation Into the Failure of CFRP T-joints Under Ice Impact and Quasi-static Loadings","authors":"Huawen Zhang, Huifang Liu, Zhenqiang Zhao, Yulong Li, Chao Zhang","doi":"10.12783/asc33/26154","DOIUrl":"https://doi.org/10.12783/asc33/26154","url":null,"abstract":"","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130498184","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}
Environmental Barrier Coatings (EBCs) have emerged as a promising means of protecting silicon based ceramic matrix composite (CMC) components for high temperature applications (e.g., aircraft engines). EBCs are often used to protect an underlying material (substrate) such as silicon carbide from extreme thermal/chemical environments. In a typical CMC/EBC system, an EBC may or may not be adhered to an underlying substrate with a bond coat (e.g., silicon). Irrespective, systems that utilize EBCs are susceptible to a number of failure modes including oxidation/delamination, recession, chemical attack and dissolution, thermomechanical degradation, erosion, and foreign object damage. Current work at NASA Glenn Research Center is aimed at addressing these failure modes in EBC systems and developing robust analysis tools to aid in the design process. The Higher-Order Theory for Functionally Graded Materials (HOTFGM), a precursor to the High- Fidelity Generalized Method of Cells micromechanics approach, was developed to investigate the coupled thermo-mechanical behavior of functionally graded composites and will be used herein to assess the development and growth of a lowstiffness thermally grown oxide (TGO) layer in EBC/CMC systems without a silicon bond coat. To accomplish this a sensitivity study is conducted to examine the influence of uniformly and nonuniformly grown oxide layer on the associated driving forces leading to mechanical failure (spallation) of EBC layer when subjected to isothermal loading.
{"title":"Coupled Thermo-mechanical Micromechanics Modeling of the Influence of Thermally Grown Oxide Layer in an Environmental Barrier Coating System","authors":"T. Ricks, S. Arnold, B. Harder","doi":"10.12783/asc33/26027","DOIUrl":"https://doi.org/10.12783/asc33/26027","url":null,"abstract":"Environmental Barrier Coatings (EBCs) have emerged as a promising means of protecting silicon based ceramic matrix composite (CMC) components for high temperature applications (e.g., aircraft engines). EBCs are often used to protect an underlying material (substrate) such as silicon carbide from extreme thermal/chemical environments. In a typical CMC/EBC system, an EBC may or may not be adhered to an underlying substrate with a bond coat (e.g., silicon). Irrespective, systems that utilize EBCs are susceptible to a number of failure modes including oxidation/delamination, recession, chemical attack and dissolution, thermomechanical degradation, erosion, and foreign object damage. Current work at NASA Glenn Research Center is aimed at addressing these failure modes in EBC systems and developing robust analysis tools to aid in the design process. The Higher-Order Theory for Functionally Graded Materials (HOTFGM), a precursor to the High- Fidelity Generalized Method of Cells micromechanics approach, was developed to investigate the coupled thermo-mechanical behavior of functionally graded composites and will be used herein to assess the development and growth of a lowstiffness thermally grown oxide (TGO) layer in EBC/CMC systems without a silicon bond coat. To accomplish this a sensitivity study is conducted to examine the influence of uniformly and nonuniformly grown oxide layer on the associated driving forces leading to mechanical failure (spallation) of EBC layer when subjected to isothermal loading.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130588729","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}
James O’Neil, A. A. Deleo, H. Yasuda, M. Salviato, Jinkyu Yang
{"title":"Deployable Structures Constructed from Composite Origami","authors":"James O’Neil, A. A. Deleo, H. Yasuda, M. Salviato, Jinkyu Yang","doi":"10.12783/ASC33/25907","DOIUrl":"https://doi.org/10.12783/ASC33/25907","url":null,"abstract":"","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130607772","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}
In archery, dynamic buckling during the launch phase compromises the target accuracy of arrows. For both dynamic and quasi-static arrow buckling, the critical load depends upon the area moment of inertia of the cross-section which should be increased at constant arrow weight, by redistributing the material as far away from the principal point of the cross-section as possible, and while keeping the material thick enough to prevent local buckling. In this paper we present an effort to optimize the cross-sectional shape of a composite arrow shaft, using a finite element based, quasi static buckling analysis keeping the length and area of the cross-section constant. The composite column considered is assumed pinned at both ends and is assumed made with fibers oriented along the length of the column. Four cross-sectional shapes, tubular circular, tubular equilateral triangular, star shaped and star with beads are analyzed in this study. The composite column is modeled in ABAQUS, and the buckling load is determined by using the “Linear Perturbation, Buckle” analysis. The transition from global to local buckling characterized by a decrease in bucking load and change in the buckled shape of the column is determined for each cross-sectional shape. The point of transition marks the maximum load that can be sustained for that cross-sectional shape. The maximum load for all the cross-sections is determined and compared. The tubular circular cross-section composite column is found to provide the highest buckling load followed by the star with bead cross-section, star shaped cross-section and tubular equilateral triangular cross-section composite column in the respective order. Thus, of the shapes considered, the tubular circular cross-section is the optimum shape for the cross-section of the arrow shaft.
{"title":"Finite Element Based Buckling Cross-Sectional Optimization for Composite Arrows","authors":"A. Srinivas, D. Dancila","doi":"10.12783/ASC33/26163","DOIUrl":"https://doi.org/10.12783/ASC33/26163","url":null,"abstract":"In archery, dynamic buckling during the launch phase compromises the target accuracy of arrows. For both dynamic and quasi-static arrow buckling, the critical load depends upon the area moment of inertia of the cross-section which should be increased at constant arrow weight, by redistributing the material as far away from the principal point of the cross-section as possible, and while keeping the material thick enough to prevent local buckling. In this paper we present an effort to optimize the cross-sectional shape of a composite arrow shaft, using a finite element based, quasi static buckling analysis keeping the length and area of the cross-section constant. The composite column considered is assumed pinned at both ends and is assumed made with fibers oriented along the length of the column. Four cross-sectional shapes, tubular circular, tubular equilateral triangular, star shaped and star with beads are analyzed in this study. The composite column is modeled in ABAQUS, and the buckling load is determined by using the “Linear Perturbation, Buckle” analysis. The transition from global to local buckling characterized by a decrease in bucking load and change in the buckled shape of the column is determined for each cross-sectional shape. The point of transition marks the maximum load that can be sustained for that cross-sectional shape. The maximum load for all the cross-sections is determined and compared. The tubular circular cross-section composite column is found to provide the highest buckling load followed by the star with bead cross-section, star shaped cross-section and tubular equilateral triangular cross-section composite column in the respective order. Thus, of the shapes considered, the tubular circular cross-section is the optimum shape for the cross-section of the arrow shaft.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"183 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120865512","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}
B. Koo, Jack Miller, Ryan Gunckel, A. Chattopadhyay, Lenore L. Dai
Optical responses of mechanophore (stress-responsive materials) in fiber reinforced polymer composites under mechanical loads were characterized. A new experimental system was developed to capture in situ mechanophore activation by recording ultraviolet (UV) excited fluorescence during uniaxial load tests. Anthracene- based mechanophore, dimeric 9-anthracene carboxylic acid (Di-AC) was synthesized and incorporated into an epoxy-based thermoset successfully. This Di-AC embedded epoxy mixture was applied to glass fiber fabric to fabricate mechanophore embedded glass fiber reinforced polymer (GFRP) composites through hand-layup process. Quasistatic and cyclic loads were performed to investigate the effect of different types of loads on mechanophore activation. The results indicated that mechanophore activation occurred at the beginning of the test during the quasistatic loading test and continued linearly before yield. Microcracks were formed in the matrix prior to yield, and UV intensity of the mechanophore exhibited nonlinear response. During fatigue tests, the intensity of fluorescence increased after a certain number of cycles. Microcracks were initiated around the middle stage of the fatigue test, the intensity also showed a nonlinear response. The potential of anthracene-based mechanophore for early damage detection in GFRP under complex loading was observed.
{"title":"In-situ Damage Precursor Detection in Fiber Reinforced Composites Using Mechanochemical Materials","authors":"B. Koo, Jack Miller, Ryan Gunckel, A. Chattopadhyay, Lenore L. Dai","doi":"10.12783/ASC33/26140","DOIUrl":"https://doi.org/10.12783/ASC33/26140","url":null,"abstract":"Optical responses of mechanophore (stress-responsive materials) in fiber reinforced polymer composites under mechanical loads were characterized. A new experimental system was developed to capture in situ mechanophore activation by recording ultraviolet (UV) excited fluorescence during uniaxial load tests. Anthracene- based mechanophore, dimeric 9-anthracene carboxylic acid (Di-AC) was synthesized and incorporated into an epoxy-based thermoset successfully. This Di-AC embedded epoxy mixture was applied to glass fiber fabric to fabricate mechanophore embedded glass fiber reinforced polymer (GFRP) composites through hand-layup process. Quasistatic and cyclic loads were performed to investigate the effect of different types of loads on mechanophore activation. The results indicated that mechanophore activation occurred at the beginning of the test during the quasistatic loading test and continued linearly before yield. Microcracks were formed in the matrix prior to yield, and UV intensity of the mechanophore exhibited nonlinear response. During fatigue tests, the intensity of fluorescence increased after a certain number of cycles. Microcracks were initiated around the middle stage of the fatigue test, the intensity also showed a nonlinear response. The potential of anthracene-based mechanophore for early damage detection in GFRP under complex loading was observed.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121665824","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}
I. Kaleel, M. Nagaraj, M. Petrolo, E. Carrera, A. Waas
The aim of the current work is to develop a multiscale framework based on higherorder 1D finite elements developed using the Carrera Unified Formulation (CUF). The multiscale framework consists of a macroscale model to describe the global structure, and a CUF micromechanical model described using the Component-Wise approach. Such an approach allows for the explicit modelling of the fiber and matrix at the microscale, resulting in a high-fidelity finite element model at both scales. The use of refined CUF elements result in a computationally efficient analysis, due to a reduction in the degrees of freedom at both scales, as well as the reduction in total computational time when compared to standard 3D finite element analysis. The parallel implementation of the multiscale framework results in additional savings in computational time.
{"title":"An Efficient Multiscale Virtual Testing Platform for Composite Via Component-wise Models","authors":"I. Kaleel, M. Nagaraj, M. Petrolo, E. Carrera, A. Waas","doi":"10.12783/asc33/25959","DOIUrl":"https://doi.org/10.12783/asc33/25959","url":null,"abstract":"The aim of the current work is to develop a multiscale framework based on higherorder 1D finite elements developed using the Carrera Unified Formulation (CUF). The multiscale framework consists of a macroscale model to describe the global structure, and a CUF micromechanical model described using the Component-Wise approach. Such an approach allows for the explicit modelling of the fiber and matrix at the microscale, resulting in a high-fidelity finite element model at both scales. The use of refined CUF elements result in a computationally efficient analysis, due to a reduction in the degrees of freedom at both scales, as well as the reduction in total computational time when compared to standard 3D finite element analysis. The parallel implementation of the multiscale framework results in additional savings in computational time.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"15 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113964077","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 method for monitoring of damage progression due to combined mechanical and hygroscopic loading in polymer composite materials is presented. Polymer-based materials have a tendency to absorb moisture from their operating environment. Dielectric properties of these materials are significantly affected by the total amount of absorbed moisture and the degree of its interaction with the host polymer. Bound water molecules which are restricted in their ability to rotate with an applied electromagnetic field contribute less to the bulk relative permittivity. 'Free' water molecules rotate without impediment and are therefore associated with a higher relative permittivity. The bulk relative permittivity as a function of total water content of a contaminated composite is a unique function of the internal physical and chemical characteristics of the specimen. Holding chemical contributions constant, physical characteristics dominate. Thus, relative permittivity provides insight into the physical state of composite, including amount of free space from processing-induced voids or, critically, the presence of physical damage such as cracks and voids across multiple length scales. Here, we demonstrate a method for leveraging this phenomenon to provide insight into the initiation and accumulation of physical damage in moisturecontaminated composites. This is accomplished using a split-post dielectric resonant technique operating in the low GHz frequency range, where dipolar contributions to relative permittivity dominate. Further, continuous and non-contact monitoring of relative permittivity is achieved by integrating a resonant cavity with a fatigue loading frame. Preliminary experimental assessment of this test method is supportive of its potential in damage tracking. Water-contaminated 12-ply bismaleimide (BMI) / quartz laminate specimens were tested in impact and flexural fatigue, while a 4-ply glass/epoxy laminate was tested in tensile fatigue while changes in relative permittivity were recorded. The results show a distinct rise in relative permittivity consistent with the expected magnitude and progression of damage in all cases.
{"title":"A Dielectric Resonant Cavity Method for Monitoring of Damage Progression in Moisture-Contaminated Composites","authors":"O. Idolor, Rishabh D Guha, L. Grace","doi":"10.12783/asc33/25963","DOIUrl":"https://doi.org/10.12783/asc33/25963","url":null,"abstract":"A method for monitoring of damage progression due to combined mechanical and hygroscopic loading in polymer composite materials is presented. Polymer-based materials have a tendency to absorb moisture from their operating environment. Dielectric properties of these materials are significantly affected by the total amount of absorbed moisture and the degree of its interaction with the host polymer. Bound water molecules which are restricted in their ability to rotate with an applied electromagnetic field contribute less to the bulk relative permittivity. 'Free' water molecules rotate without impediment and are therefore associated with a higher relative permittivity. The bulk relative permittivity as a function of total water content of a contaminated composite is a unique function of the internal physical and chemical characteristics of the specimen. Holding chemical contributions constant, physical characteristics dominate. Thus, relative permittivity provides insight into the physical state of composite, including amount of free space from processing-induced voids or, critically, the presence of physical damage such as cracks and voids across multiple length scales. Here, we demonstrate a method for leveraging this phenomenon to provide insight into the initiation and accumulation of physical damage in moisturecontaminated composites. This is accomplished using a split-post dielectric resonant technique operating in the low GHz frequency range, where dipolar contributions to relative permittivity dominate. Further, continuous and non-contact monitoring of relative permittivity is achieved by integrating a resonant cavity with a fatigue loading frame. Preliminary experimental assessment of this test method is supportive of its potential in damage tracking. Water-contaminated 12-ply bismaleimide (BMI) / quartz laminate specimens were tested in impact and flexural fatigue, while a 4-ply glass/epoxy laminate was tested in tensile fatigue while changes in relative permittivity were recorded. The results show a distinct rise in relative permittivity consistent with the expected magnitude and progression of damage in all cases.","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125625073","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}
J. Lua, A. Sadeghirad, Xiaodong Cui, A. Karuppiah, C. Saathoff, W. Seneviratne
{"title":"Defects Characterization, Damage Mapping, and Property Evaluation of Composites","authors":"J. Lua, A. Sadeghirad, Xiaodong Cui, A. Karuppiah, C. Saathoff, W. Seneviratne","doi":"10.12783/ASC33/26144","DOIUrl":"https://doi.org/10.12783/ASC33/26144","url":null,"abstract":"","PeriodicalId":337735,"journal":{"name":"American Society for Composites 2018","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126008427","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：