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Stress corrosion cracking in a unidirectional E-glass/polyester composite subjected to static and cyclic loading conditions 单向e -玻璃/聚酯复合材料在静态和循环载荷条件下的应力腐蚀开裂
Journal of Composites Technology & Research Pub Date : 2003-10-01 DOI: 10.1520/CTR10959J
D. Armentrout, M. Gentz, L. Kumosa, B. Benedikt, M. Kumosa
{"title":"Stress corrosion cracking in a unidirectional E-glass/polyester composite subjected to static and cyclic loading conditions","authors":"D. Armentrout, M. Gentz, L. Kumosa, B. Benedikt, M. Kumosa","doi":"10.1520/CTR10959J","DOIUrl":"https://doi.org/10.1520/CTR10959J","url":null,"abstract":"This work evaluates the effects of static and cyclic loading conditions on the stress corrosion process in unidirectional glass/modified polyester composite in the presence of a nitric acid solution. The composites were investigated under static, cyclic, and static with overload conditions using a rectangular specimen with centrally positioned grooves. The stress corrosion process was monitored using acoustic emission (AE). It was found that the time-to-failure of the composite specimens were only slightly affected by loading conditions. However, the large scatter in the time-to-failure of the specimens did not allow for the proper evaluation of the effect of the cyclic loads on the stress corrosion fracture process. It seemed that the time-to-failure were more influenced by the specimen variations than by the type of loading. By using an AE digital set-up based on four transducers, not only can the fiber fracture by stress corrosion be very accurately monitored, but also the location of AE sources can be precisely determined.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"70 1","pages":"1-17"},"PeriodicalIF":0.0,"publicationDate":"2003-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90151182","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}
引用次数: 10
Wrinkling of Zebra Skin Sandwich Panels 斑马皮夹芯板的起皱
Journal of Composites Technology & Research Pub Date : 2003-10-01 DOI: 10.1520/CTR10960J
B. Bekisli, J. Grenestedt
{"title":"Wrinkling of Zebra Skin Sandwich Panels","authors":"B. Bekisli, J. Grenestedt","doi":"10.1520/CTR10960J","DOIUrl":"https://doi.org/10.1520/CTR10960J","url":null,"abstract":"The wrinkling, or skin buckling, behavior of sandwich panels with skins consisting of equally spaced strips was investigated. These so-called zebra skin sandwiches proved to be superior to full skin sandwiches in terms of weight and wrinkling strength. Two and three-dimensional finite element analyses were performed and the full skin sandwich results were compared to various results in the open literature. An approximate analytical estimate, using Euler-Bernoulli kinematics in the skin and a simple exponentially decaying field in the core, was derived and compared with finite element results.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"40 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2003-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76274972","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}
引用次数: 3
Effect of Interfacial Bonding Strength on Thermal Expansion Behavior of Carbon-Fiber-Reinforced Copper-Matrix Composites 界面结合强度对碳纤维增强铜基复合材料热膨胀行为的影响
Journal of Composites Technology & Research Pub Date : 2003-08-01 DOI: 10.1520/CTR10958J
Yl. Wang, Fg Zhou, Y. Wan
{"title":"Effect of Interfacial Bonding Strength on Thermal Expansion Behavior of Carbon-Fiber-Reinforced Copper-Matrix Composites","authors":"Yl. Wang, Fg Zhou, Y. Wan","doi":"10.1520/CTR10958J","DOIUrl":"https://doi.org/10.1520/CTR10958J","url":null,"abstract":"Alloying elements were added to the copper matrix to produce unidirectional carbon-fiber-reinforced copper-matrix composites with different interfacial bonding strengths (IBS). The thermal expansion coefficients of these composites were determined to investigate the influence of the IBS on the thermal expansion behavior at a low temperature range. The results showed that the thermal expansion coefficient (CTE) at low temperatures (elastic region) of the composites was controlled by the IBS. Furthermore, the IBS of the composites was observed to control the thermal stresses in the matrix and, therefore, to affect the temperature of the onset of matrix yielding. However, the relationship between IBS and expansion behavior at a high temperature range (beyond elastic region) for the present carbon-fiber copper composite system cannot be determined because of the influence of matrix strength. Further work is underway to develop a model so as to correlate the IBS with the CTE of the composites under elastic stage, and a suitable composite system is needed to correlate the IBS to the CTE at high temperatures.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"2 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2003-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90198185","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}
引用次数: 1
Influence of temperature on the fatigue life of a quasi-isotropic Gr/Ep laminate 温度对准各向同性Gr/Ep层合板疲劳寿命的影响
Journal of Composites Technology & Research Pub Date : 2003-08-01 DOI: 10.1520/CTR10956J
K. R. Uleck, A. Vizzini
{"title":"Influence of temperature on the fatigue life of a quasi-isotropic Gr/Ep laminate","authors":"K. R. Uleck, A. Vizzini","doi":"10.1520/CTR10956J","DOIUrl":"https://doi.org/10.1520/CTR10956J","url":null,"abstract":"This paper describes the development and results of a tension-tension fatigue life test program. The fatigue life of a quasi-isotropic graphitelepoxy laminate was experimentally measured at three temperatures: -195°C, 22°C, and 121 °C. To perform testing at these temperatures a supplemental gripping fixture and a cold cell were designed and manufactured. Issues addressed during the test program include failure of the gripping system, grip-induced failure of the test laminate, and temperature stability. The test results showed that the test laminate's nominal fatigue life improved when tested at -195°C, and decreased when tested at 121°C.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"24 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2003-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89578524","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}
引用次数: 4
Experimental Evaluation of Damping of Fiber-Reinforced Composites 纤维增强复合材料阻尼性能的实验研究
Journal of Composites Technology & Research Pub Date : 2003-04-07 DOI: 10.1520/CTR10952J
R. Chandra, S. Singh, K. Gupta
{"title":"Experimental Evaluation of Damping of Fiber-Reinforced Composites","authors":"R. Chandra, S. Singh, K. Gupta","doi":"10.1520/CTR10952J","DOIUrl":"https://doi.org/10.1520/CTR10952J","url":null,"abstract":"Anisotropic behavior of damping in fiber-reinforced composites is well established. An attempt is made to measure all the six loss factors for glass fiber-reinforced epoxy (three in normal and three in shear) experimentally using free decay method. Different types of specimen such as beam, tubular and cuboidal in shape made from glass fiber-reinforced epoxy are tested under different loading conditions. The six loss factors (η 11 , η 22 , η 33 , η 12 , η 13 and η 23 ) so determined are compared with the analytical results.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"93 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2003-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77438686","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}
引用次数: 22
Analytical Determination of Localized Heat Damage in Fiberglass Reinforced Resin Beams Using the Frequency Response Shifting 用频响位移法分析玻璃钢树脂梁的局部热损伤
Journal of Composites Technology & Research Pub Date : 2003-04-07 DOI: 10.1520/CTR10955J
H. Nayeb-Hashemi, A. Harrison, A. Vaziri
{"title":"Analytical Determination of Localized Heat Damage in Fiberglass Reinforced Resin Beams Using the Frequency Response Shifting","authors":"H. Nayeb-Hashemi, A. Harrison, A. Vaziri","doi":"10.1520/CTR10955J","DOIUrl":"https://doi.org/10.1520/CTR10955J","url":null,"abstract":"The dynamic response of a localized, heat-damaged, fiberglass-reinforced epoxy cantilever beam is obtained as a function of damaged length and damage severity. A heat-damaged area causes a reduction in the local stiffness of the beam and introduces a complex damping in the damaged zone. These variations in the local mechanical properties could result in changing vibration characteristics of the beam. The variations in the system characteristic could then be used to assess the structural integrity of the composite beam. A cantilever beam made of a glass fiber-resin composite material and damaged by a hot tip contact element and a laser beam is evaluated for its dynamic response using numerical methods. The laser beam caused local melting of many fibers in the damaged area and thus reducing the stiffness of the beam in the damaged area. The beam is analyzed by modeling it as a lumped system and a continuous system and by a finite element. The goal of the research is to find out whether the changes in the frequency response of the damaged beam can be used as a diagnostic tool for estimating the severity of the damage. The results show that the size and location of damage are equally as important as the local stiffness and damping of the damaged region in terms of their effects on the beam resonant frequencies. The results indicate that the resonance frequencies may not be suitable parameters for estimating the residual tensile strength of the composite. A 50% reduction in the local bending rigidity produced relatively little change in the system first resonance frequency. In contrast, it significantly reduced the residual tensile strength of the composite.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"8 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2003-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90973644","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}
引用次数: 3
A rational procedure for development of hybrid composite masts 混合复合材料桅杆的合理开发程序
Journal of Composites Technology & Research Pub Date : 2003-04-07 DOI: 10.1520/CTR10953J
F. Taheri, M. Hassan
{"title":"A rational procedure for development of hybrid composite masts","authors":"F. Taheri, M. Hassan","doi":"10.1520/CTR10953J","DOIUrl":"https://doi.org/10.1520/CTR10953J","url":null,"abstract":"This study was carried out with the aim of developing a rational and effective design procedure for the development of cost-effective composite masts that can be manufactured by automated manufacturing procedure. This was in response to the lack of availability of systematic design and analytical procedure for such structural components, and the relatively high cost of the currently available composite masts in market. To achieve this objective, a systematic evaluation of the loads on the mast was performed, followed by a relatively accurate design procedure that considered structural design of an actual mast for a commonly used YD-40 boat. It will be shown that the proposed mast will be less expensive than the commercially available all carbon-epoxy masts.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"20 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2003-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91169042","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}
引用次数: 0
Mechanical Behavior of a Woven Graphite/PMR-15 Composite at Room and Elevated Temperatures Determined from the ±45° Tensile and Iosipescu Shear Tests 编织石墨/PMR-15复合材料在室温和高温下的力学行为，由±45°拉伸和Iosipescu剪切试验确定
Journal of Composites Technology & Research Pub Date : 2003-01-01 DOI: 10.1520/CTR11001J
M. Gentz, D. Armentrout, P. Rupnowski, L. Kumosa, J. Sutter, M. Kumosa
{"title":"Mechanical Behavior of a Woven Graphite/PMR-15 Composite at Room and Elevated Temperatures Determined from the ±45° Tensile and Iosipescu Shear Tests","authors":"M. Gentz, D. Armentrout, P. Rupnowski, L. Kumosa, J. Sutter, M. Kumosa","doi":"10.1520/CTR11001J","DOIUrl":"https://doi.org/10.1520/CTR11001J","url":null,"abstract":"Failure and stiffness properties of a woven 8 harness satin (8HS) graphite/PMR-15 composite have been investigated at room temperature and at 315°C by performing the ±45° tensile and Iosipescu tests. Acoustic emission has been monitored during testing. The critical loads for the initiation of damage in the composite have been determined. In particular, the specimen width effect has been investigated in the case of the ±45° specimens by testing the specimens with their width ranging from 12.7–50.8 mm. The results from the high temperature tests have been compared with the room temperature data presented in Refs. 1 and 2. Similar to the room temperature ±45° tests, the shear stresses at the onset of intralaminar damage in the specimens and the shear stresses at the maximum loads at 315°C are significantly affected by the specimen width effect. The trends in the damage initiation stresses and the maximum stresses as a function of specimen width at 315°C have been found to be very similar to the room temperature data with the stresses increasing almost linearly with the specimen width. It has also been shown in this project that the shear stresses at the onset of intralaminar damage and at the maximum load at 315°C depend very strongly on the specimen type. The shear stresses determined at the onset of damage and maximum loads from the Iosipescu tests at 315°C are noticeably higher than the stresses from the ±45° tests. The ±45° tensile test significantly underestimates the room and elevated temperature shear strength properties of the 8HS graphite/PMR-15 composite in comparison with the Iosipescu shear test.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"52 1","pages":"11065"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81148991","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}
引用次数: 16
Calendar on Composites 复合材料日历
Journal of Composites Technology & Research Pub Date : 2003-01-01 DOI: 10.1520/CTR11007J
Ea Armanios, R. Bucinell, Dw Wilson
{"title":"Calendar on Composites","authors":"Ea Armanios, R. Bucinell, Dw Wilson","doi":"10.1520/CTR11007J","DOIUrl":"https://doi.org/10.1520/CTR11007J","url":null,"abstract":"21-25 July 2002 ACUN-4 Internatinal Composites Conference: Composite Systems-Macrocomposites, Microcomposites, Nanocomposites, at the University of New South Wales (UNSW), Sydney Australia, Contact: Dr Sri Bandyopadhyay, School of Materials Science and Engineering, UNSW, Sydney 2052, Australia, tel: +61 2.9385.4509, fax: +61 2.9385.5956, email: s.bandyopadhyay@unsw.edu.au, web: http://ww.materials.unsw.edu.au.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"36 1","pages":"286-287"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81580289","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}
引用次数: 0
An Efficient Analysis for the Debonding of Stitched Skin-Stiffened Structures 缝合皮加筋结构脱粘的有效分析
Journal of Composites Technology & Research Pub Date : 2003-01-01 DOI: 10.1520/CTR11002J
E. Glaessgen, I. Raju, C. Poe
{"title":"An Efficient Analysis for the Debonding of Stitched Skin-Stiffened Structures","authors":"E. Glaessgen, I. Raju, C. Poe","doi":"10.1520/CTR11002J","DOIUrl":"https://doi.org/10.1520/CTR11002J","url":null,"abstract":"An analysis based on plate finite elements, nonlinear spring elements and the virtual crack closure technique has been implemented to study the effect of stitching on strain energy release rates for debond configurations. The stitches were modeled as discrete nonlinear spring elements with a compliance determined by experiment. The axial and shear behavior of the stitches was considered, however, the two compliances and failure loads were assumed to be independent. Both a double cantilever beam (mode I) and a mixed mode skin-stiffener debond configuration were studied. In the double cantilever beam configuration, G I began to decrease once the debond had grown beyond the first row of stitches and was reduced to zero for long debonds. In the mixed-mode skin-stiffener configuration, G I showed a similar behavior as in the double cantilever beam configurations; however, G II remained nonzero over the range of debond lengths considered.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"40 1","pages":"11067"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77836706","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}
引用次数: 6
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