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Journal of Composites Technology & Research最新文献

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Some Results from X-Ray Computed Tomography Applied to Metal Matrix Composites 金属基复合材料x射线计算机断层扫描的一些结果
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10624J
M. Gonzalez, G. Dominguez, C. Bathias
{"title":"Some Results from X-Ray Computed Tomography Applied to Metal Matrix Composites","authors":"M. Gonzalez, G. Dominguez, C. Bathias","doi":"10.1520/CTR10624J","DOIUrl":"https://doi.org/10.1520/CTR10624J","url":null,"abstract":"This study presents computed tomography (CT) results from a medical scanner carried out on metal matrix composite materials obtained by a casting process. In order to test the capabilities of the CT technique to study the flaws in the sample, few precautions have been taken during the manufacturing process, resulting in composite ingots with many flaws (porosity, segregation, etc.). The mold was modified to obtain a concentration of particles at the bottom of the ingot. CT images and scanning electronic microscopy images were taken at the same slice surface and show good agreement in the distribution of particles and porosity. The spatial resolution of the medical scanner (12 pairs of lines/cm) lets us distinguish between, at the mesoscopic scale, heterogeneous distribution of particles and porosity, but not individual flaws.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"3 1","pages":"45-48"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87432459","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: 8
A Simple Discrete-Tow Model for Analysis of Textile Composites 一种用于纺织复合材料分析的简单离散束模型
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10541J
C. Carrier, R. Averill
{"title":"A Simple Discrete-Tow Model for Analysis of Textile Composites","authors":"C. Carrier, R. Averill","doi":"10.1520/CTR10541J","DOIUrl":"https://doi.org/10.1520/CTR10541J","url":null,"abstract":"A simplified discrete-tow model is presented for analysis of textile composite materials. This model discretely represents the fiber tows and resin independently as beam and shell finite elements, respectively. The approach is simple and very computationally efficient, making it especially well suited for modeling sections of a textile composite material much larger than a unit cell. In the present study, the discrete-tow model is formulated in detail and its utility is demonstrated for the prediction of effective properties for a variety of plain weave and triaxial braid materials.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"46 1","pages":"196-206"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85169317","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
A Life Prediction Methodology for Thick Section Composites Used in Civil Infrastructure 土木基础设施用厚截面复合材料寿命预测方法
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10546J
J. Senne, J. Lesko, S. Case
{"title":"A Life Prediction Methodology for Thick Section Composites Used in Civil Infrastructure","authors":"J. Senne, J. Lesko, S. Case","doi":"10.1520/CTR10546J","DOIUrl":"https://doi.org/10.1520/CTR10546J","url":null,"abstract":"As fiber-reinforced polymer (FRP) composites find application in highway bridge structures, methodologies for describing their long-term performance under service loading will be a necessity for designers. The designer of FRP bridge structures will be faced with out-of-plane damage and delamination at ply interfaces, The damage most often occurs between hybrid plys and dominates the lifetime response of a thick-section FRP structure. In this paper a model is developed to address these issues. The methodology employs the quadratic delamination initiation failure criteria, in conjunction with a delamination growth law to describe the out-of-plane damage under bending. These phenomena are combined with the critical element residual strength life prediction tool to determine remaining bending stiffness and moment capacity of a pultruded and hybrid FRP 20.3-cm-deep structural shape. The model successfully describes the onset of delamination prior to fiber failure and suggests that out-of-plane failure controls the life of the structure.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"101 1","pages":"241-248"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80430436","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
Fiber-Reinforced Composite and Wood Bonded Interfaces: Part 2. Fracture 纤维增强复合材料和木材粘合界面:第2部分。骨折
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10545J
J. Davalos, P. Qiao, B. Trimble
{"title":"Fiber-Reinforced Composite and Wood Bonded Interfaces: Part 2. Fracture","authors":"J. Davalos, P. Qiao, B. Trimble","doi":"10.1520/CTR10545J","DOIUrl":"https://doi.org/10.1520/CTR10545J","url":null,"abstract":"The evaluation of durability and shear strength of FRP-wood bonded interfaces is presented in Part 1 of this two-part study (see Davalos et al. [1]); here, in Part 2, an innovative contoured double-cantilever beam (CDCB) specimen is used to evaluate Mode I fracture of bonded interfaces, and interface fracture toughness data are experimentally obtained for dry and wet conditions. The specimens are designed by the Rayleigh-Ritz method to achieve a linear rate of compliance with respect to crack length. The proposed CDCB specimen is an efficient tool to evaluate Mode I fracture of hybrid interfaces, and the fracture toughness data obtained can be used to predict whether or not a bonded interface will delaminate under general service conditions. Based on the results of this two-part study, recommendations and guidelines are given for evaluation and qualification of FRP-wood bonded interfaces; the methods presented are useful for designing bonded joints, evaluating in-service durability of interfaces, and obtaining fracture toughness data for FRP-wood material combinations.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"42 1","pages":"232-240"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85356300","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: 39
Residual strength-based life predictions of composite materials under combined damage mechanisms 复合损伤机制下基于残余强度的复合材料寿命预测
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10540J
H. Halverson, S. Case
{"title":"Residual strength-based life predictions of composite materials under combined damage mechanisms","authors":"H. Halverson, S. Case","doi":"10.1520/CTR10540J","DOIUrl":"https://doi.org/10.1520/CTR10540J","url":null,"abstract":"We seek a method by which the residual strengths of composites subjected to combined degradation mechanisms may be calculated. Three different approaches are considered. First, the inputs to the residual strength analysis are purely phenomenological. Second, we make use of a micromechanics-based simulation to combine the effects of two specified damage mechanisms. Finally, we develop a hybrid approach in which the results from the micromechanics simulations for individual mechanisms are used as inputs to the residual strength model as if they had been obtained from experimental data. The residual strength model is then used to predict the combined behavior, and the results are compared with those obtained directly from the simulations. For the two mechanisms considered (slow crack growth and asperity creep), the results for the detailed micromechanical simulations were accurately represented by the residual strength-based model.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"33 1","pages":"187-195"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72905452","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
Tensile Behavior of Filament-Wound Composites in Medium Vacuum 细丝缠绕复合材料中真空拉伸性能研究
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10543J
C. L. Shirey, C. Bakis
{"title":"Tensile Behavior of Filament-Wound Composites in Medium Vacuum","authors":"C. L. Shirey, C. Bakis","doi":"10.1520/CTR10543J","DOIUrl":"https://doi.org/10.1520/CTR10543J","url":null,"abstract":"In order to design the most efficient flywheel energy systems using fiber-reinforced polymer composite rotors, design allowables for the rotor material in a realistic environment and under realistic stresses must first be established. As a first step, this investigation characterizes the 0-deg tensile behavior of unidirectional T700 carbon and E-glass reinforced epoxy composites both as received and after conditioning at a pressure of 15 mtorr and a temperature of 20 to 25°C. Constant-amplitude tension-tension cyclic fatigue tests were carried out on half the specimens in a similar medium vacuum environment. Weights of specimens were tracked with immeasurable changes noted due to vacuum conditioning for up to 300 days' duration. E-glasslepoxy specimens had a higher quasi-static strength following conditioning, but this difference was not evident on an absolute stress basis in the fatigue tests. At the baseline comparison point of 10 5 cycles to failure, there was little difference in fatigue strength of as-received and conditioned E-glasslepoxy specimens. In the case of T700/epoxy, little difference between conditionings was noted in quasi-static tests, but as-received specimens had slightly higher fatigue strength at a lifetime of 10 5 cycles. Microscopic inspection of fracture surfaces following quasi-static and fatigue failures revealed no significant differences due to the type of loading or conditioning.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"75 1","pages":"213-223"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79445235","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
Preamble to the Collection of Papers Based on Presentations Given at the Symposium on Durability of Composites, Dedicated in Honor of Professor Kenneth L. Reifsnider of Virginia Tech 在纪念弗吉尼亚理工大学Kenneth L. Reifsnider教授的复合材料耐久性研讨会上发表的论文文集的序言
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10538J
C. Bakis
{"title":"Preamble to the Collection of Papers Based on Presentations Given at the Symposium on Durability of Composites, Dedicated in Honor of Professor Kenneth L. Reifsnider of Virginia Tech","authors":"C. Bakis","doi":"10.1520/CTR10538J","DOIUrl":"https://doi.org/10.1520/CTR10538J","url":null,"abstract":"","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"64 1","pages":"175-176"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76200234","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
Effect of High-Frequency Low-Amplitude Impact Loads on Polymeric Composites 高频低振幅冲击载荷对高分子复合材料的影响
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10623J
R. Thomas, R. Krishnamurthy
{"title":"Effect of High-Frequency Low-Amplitude Impact Loads on Polymeric Composites","authors":"R. Thomas, R. Krishnamurthy","doi":"10.1520/CTR10623J","DOIUrl":"https://doi.org/10.1520/CTR10623J","url":null,"abstract":"Composites are used abundantly in aerospace applications. A major issue facing the aerospace industry is the effect of service exposure on the performance of graphite/epoxy structural components. Detailed studies were performed on the structural integrity of graphite epoxy laminations subjected to high-frequency, low-amplitude impact loads. The material response was evaluated by change in stiffness, residual work, and by permanent set and damping coefficient and other related features. The objective of the study was to evaluate the performance, and thereby assess the suitability of polymeric composites as materials for aerospace models for high-speed wind tunnel testing by simulated trials. The observations indicated that high-frequency, low-load impact improves the stiffness of the graphite-epoxy composite; however, it was associated with a reduction in the damping characteristics. The improvement can be attributed to a change in the modulus of the reinforcement due to strain stiffening.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"18 1","pages":"40-44"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85204187","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: 2
Stress transfer in the fiber/matrix interface of titanium matrix composites due to thermal mismatch and reaction layer development 热失配和反应层形成导致的钛基复合材料纤维/基体界面应力传递
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10620J
P. Peters, J. Hemptenmacher, A. Werner
{"title":"Stress transfer in the fiber/matrix interface of titanium matrix composites due to thermal mismatch and reaction layer development","authors":"P. Peters, J. Hemptenmacher, A. Werner","doi":"10.1520/CTR10620J","DOIUrl":"https://doi.org/10.1520/CTR10620J","url":null,"abstract":"It is well known that the difference in the coefficient of thermal expansion of the components of titanium matrix composites with the SCS-6 SiC-fiber gives rise to substantial residual stresses. Due to the fact that the fiber/matrix bond strength is low (as long as there is still a substantial thick carbon protection layer) fiber/matrix stress transfer is realized partly through interfacial friction enabled by the residual radial compressive stress at the fiber/matrix interface. Fiber matrix reactions usually lead to a volume change. In the present investigation this volume change is investigated analytically as well as experimentally on the SCS-6/IMI834 system. It was determined analytically with the aid of a two-dimensional stress analysis that fiber/matrix reaction leads to a reduction of the residual stresses. Experimental results on composite specimen diameter change indicate an increase of the residual stress caused by an unexpected shrinkage of the matrix. Another source for residual stress is an unequal (inwards and outwards) radial growth of the reaction layer if the diffusion rate of the reacting species through the reaction layer differs from the stoichiometric relation for the reaction.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"1 1","pages":"12-22"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88149421","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
Fatigue Behavior of Glass-Reinforced Epoxy Resin Submitted to Hot-Wet Aging 热湿时效下玻璃增强环氧树脂的疲劳行为
Journal of Composites Technology & Research Pub Date : 2000-10-01 DOI: 10.1520/CTR10542J
G. Zaffaroni, C. Cappelletti
{"title":"Fatigue Behavior of Glass-Reinforced Epoxy Resin Submitted to Hot-Wet Aging","authors":"G. Zaffaroni, C. Cappelletti","doi":"10.1520/CTR10542J","DOIUrl":"https://doi.org/10.1520/CTR10542J","url":null,"abstract":"To assess the effect of hot-wet aging on the properties of a glass-reinforced epoxy resin, three kinds of specimens were subjected to static and dynamic (fatigue) tests, in both dry and moisture-saturated conditions. Although a reduction of both elastic properties and strengths was found, it seems that hygrothermal aging has no effect on the S-N fatigue behavior when the part at low loads is considered. It is proposed that there is a balance between the damage generated by micro-effects (such as fiber damaging, resin micro-cracking or micro-crazing) and the increased energy dissipation capability of the resin generated by the absorbed moisture. The first kind of behavior is dominant at high loads (low number of cycles: i.e., the static situation), while the second is more important where a high number of cycles is concerned.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"45 1","pages":"207-212"},"PeriodicalIF":0.0,"publicationDate":"2000-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91110214","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: 5
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