Journal of Composites Technology & Research最新文献_第10页

Preliminary Mechanical Property Assessment of an Ultra SCS®/Ti-22A1-23Nb Composite Ultra SCS®/Ti-22A1-23Nb复合材料力学性能初步评价

Journal of Composites Technology & Research Pub Date : 1999-07-01 DOI: 10.1520/CTR10617J

A. Rosenberger, Preston M. Smith, S. Russ

{"title":"Preliminary Mechanical Property Assessment of an Ultra SCS®/Ti-22A1-23Nb Composite","authors":"A. Rosenberger, Preston M. Smith, S. Russ","doi":"10.1520/CTR10617J","DOIUrl":"https://doi.org/10.1520/CTR10617J","url":null,"abstract":"The mechanical performance of an orthorhombic-based titanium aluminide matrix composite (OTMC) reinforced with Ultra SCS® silicon carbide continuous monofilament (i.e., Ultra SCS®/Ti-22Al-23Nb) was investigated. Tensile properties, creep resistance, isothermal fatigue, and thermomechanical fatigue were examined over the temperature range from 20 to 760°C, with the bulk of the testing conducted at the upper end of this range to more fully characterize the high-temperature performance of this new composite system. A comparison was made with two similar OTMCs consisting of SCS-6 and Trimarc 1® silicon carbide fiber reinforcement of a Ti-22Al-23Nb matrix. In general, the longitudinal properties benefited significantly as a result of the higher-strength Ultra SCS® fiber. Both the cyclic behavior, isothermal fatigue, and in-phase thermomechanical fatigue, as well as static properties, tension, and creep were improved. However, matrix-dominated performance, including out-of-phase thermomechanical fatigue and transverse properties, was similar or exhibited a slight debit in the Ultra SCS®/Ti-22Al-23 composite. The demonstrated improvement in longitudinal properties makes the Ultra SCS® composite system an excellent choice for rotating components in advanced gas turbine engine applications. However, improvements in transverse properties may still be required for those applications subjected to appreciable off-axis loads.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"66 1","pages":"164-172"},"PeriodicalIF":0.0,"publicationDate":"1999-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85208804","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

Aging Analyses of Polymer Composites Through Time-Temperature Equivalence 基于时间-温度等效的聚合物复合材料老化分析

Journal of Composites Technology & Research Pub Date : 1999-07-01 DOI: 10.1520/CTR10618J

J. Seferis

{"title":"Aging Analyses of Polymer Composites Through Time-Temperature Equivalence","authors":"J. Seferis","doi":"10.1520/CTR10618J","DOIUrl":"https://doi.org/10.1520/CTR10618J","url":null,"abstract":"A fundamental problem of advanced airplane composite systems is the lack of understanding of the aging process and how it affects the material properties associated with degradation. The concept of Equivalent Property Time (EPT) was established and can be used to understand degradation of polymers and composites in a uniform manner, both for isothermal and dynamic elevated temperature exposures. In this work, bismaleimide neat resin and composite degradation was analyzed with isothermal and dynamic thermogravimetric analysis adapting a descriptive time-temperature concept originally developed for the curing of thermosets. The concept, defined as EPT, described the experimental data accurately for the experimental conditions tested. Thus, this methodology was demonstrated to be a useful tool in designing aging experiments and assessing the lifetime of composite systems. An extension of this concept was developed to include Equivalent Cycle Time (ECT), which involves the effects of cycling-heating, cooling, and holding, which can be used to understand degradation aging phenomena from repeated exposure. Collectively, this work focused on providing an understanding of cycling phenomena for polymers and composites as they relate to environmental influences and their accelerated aging behavior.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"4 1","pages":"173-179"},"PeriodicalIF":0.0,"publicationDate":"1999-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81845594","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: 19

Behavior of 3-D Orthogonally Woven Composites Under Tensile Loading 三维正交编织复合材料在拉伸载荷下的性能

Journal of Composites Technology & Research Pub Date : 1999-07-01 DOI: 10.1520/CTR10616J

N. Naik, B. Thuruthimattam

引用次数: 12

Damage Modeling of a Transversely Loaded Titanium Matrix Composite Under Cyclic Conditions 循环条件下横向加载钛基复合材料损伤模型研究

Journal of Composites Technology & Research Pub Date : 1999-04-01 DOI: 10.1520/CTR10949J

R. Neu, Amit J. Patel

引用次数: 2

Low-Velocity Impact Response of Cross-Ply Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core 中空和泡沫填充z针增强芯层复合材料的低速冲击响应

Journal of Composites Technology & Research Pub Date : 1999-04-01 DOI: 10.1520/CTR10950J

U. Vaidya, M. Kamath, M. Hosur, H. Mahfuz, S. Jeelani

{"title":"Low-Velocity Impact Response of Cross-Ply Laminated Sandwich Composites with Hollow and Foam-Filled Z-Pin Reinforced Core","authors":"U. Vaidya, M. Kamath, M. Hosur, H. Mahfuz, S. Jeelani","doi":"10.1520/CTR10950J","DOIUrl":"https://doi.org/10.1520/CTR10950J","url":null,"abstract":"Sandwich composites offer unique lightweight and high bending stiffness advantages for a wide variety of engineered structures. Traditional foam core sandwich constructions exhibit low transverse stiffness and catastrophic compression failure of the core, besides being inaccessible in terms of space. In this study, two configurations including a hollow truss/Z-pin core comprising a three-dimensional (3-D) open network of titanium pins and a foam core reinforced with a 3-D arrangement of titanium pins have been considered in conjunction with traditional foam core sandwich composites. These innovative core designs have the potential to enhance the impact damage resistance, and provide damage containment mechanisms and space/core accessibility advantages. The top and bottom facesheets in all three types of sandwich constructions are made from 16 layers of E-glass/epoxy prepregs stacked in crossly orientation. The low-velocity impact response of the composites is studied at five energy levels, ranging from 11 to 40 J, with an intention of investigating the damage initiation, damage propagation, and failure mechanisms. The influence of spacing the Z-pins in a foam core has also been studied at the same five energy levels. Detailed microscopic inspection has been conducted to determine the impact failure characteristics of the three types of sandwich composites. For the energy levels considered, the results demonstrate that by reinforcing the foam cells with Z-pins, low-velocity impact damage is contained effectively and is limited to the localized dimensions of the core and facesheet that lie within a pain cluster dimension.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"10 1","pages":"84-97"},"PeriodicalIF":0.0,"publicationDate":"1999-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87887163","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: 43

Measured Through-the-Thickness Thermal Diffusivity of Carbon Fiber Reinforced Composite Materials 碳纤维增强复合材料的穿透厚度热扩散系数测量

Journal of Composites Technology & Research Pub Date : 1999-04-01 DOI: 10.1520/CTR10951J

J. Zalameda

{"title":"Measured Through-the-Thickness Thermal Diffusivity of Carbon Fiber Reinforced Composite Materials","authors":"J. Zalameda","doi":"10.1520/CTR10951J","DOIUrl":"https://doi.org/10.1520/CTR10951J","url":null,"abstract":"The thermal diffusivity of carbon fiber reinforced composite materials is dependent on fiber, matrix, and porosity volume fractions. Since the carbon fiber thermal conductivity is much greater than the epoxy resin matrix thermal conductivity, thermal diffusivity is a good indicator of the fiber volume fraction. In this study, through-the-thickness thermal diffusivity images were obtained nondestructively on carbon fiber reinforced composite plates, and the values varied from 0.0035 to 0.0062 cm2/s. The fiber and porosity volume fractions were measured destructively, and their values varied from 56.0 to 70.5% and from 0.9 to 7.2%, respectively. The destructive test data were used as a standard for comparison of three commonly used transverse equivalent thermal conductivity models: the Stacked Plate, the mixed flow Cylindrical Fiber model, and the Composite Circular Assemblage model. In these models, a porosity correction is also studied. There was very good agreement between the Composite Circular Assemblage and Cylindrical Fiber model when porosity levels were less than 2%. The porosity correction helped to reduce the chi-squared value by 24% in the Cylindrical Filament model. Finally, the potential is discussed to image fiber volume fraction nondestructively using the described thermal measurement system.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"3 2","pages":"98-102"},"PeriodicalIF":0.0,"publicationDate":"1999-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91482355","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: 21

Compression After Impact Testing of Carbon Fiber Reinforced Plastic Laminates 碳纤维增强塑料层压板冲击后压缩性能试验

Journal of Composites Technology & Research Pub Date : 1999-04-01 DOI: 10.1520/CTR10947J

M. Hosur, C. Murthy, T. S. Ramurthy

引用次数: 11

Compressive Strength of Hybrid Composite Tubes After Low-Energy Impact 复合材料管材低能冲击后的抗压强度

Journal of Composites Technology & Research Pub Date : 1999-04-01 DOI: 10.1520/CTR10948J

H. Liu, N. Tai, S. Lin

引用次数: 8

Optimal design of laminates for maximum buckling resistance and minimum weight 层压板的优化设计，以获得最大的抗屈曲能力和最小的重量

Journal of Composites Technology & Research Pub Date : 1999-01-01 DOI: 10.1520/CTR10609J

P. Khong

引用次数: 5

Translaminar Reinforced Composites: A Review 跨层增强复合材料:综述

Journal of Composites Technology & Research Pub Date : 1999-01-01 DOI: 10.1520/CTR10607J

L. Dickinson, G. Farley, Mk Hinders

{"title":"Translaminar Reinforced Composites: A Review","authors":"L. Dickinson, G. Farley, Mk Hinders","doi":"10.1520/CTR10607J","DOIUrl":"https://doi.org/10.1520/CTR10607J","url":null,"abstract":"A trans-laminar-reinforced (TLR) composite may be defined as a composite laminate with up to 5% volume of fibrous reinforcement oriented in a translaminar or through-thickness direction. The TLR can be continuous threads as in stitched laminates, or it can be discontinuous rods or pins as in Z-fiber materials. These materials may be considered a subset of 3D composites, with the distinction that the material structure is a simple layered structure with only a few percent volume of reinforcement through-the-thickness. It has been repeatedly documented in the literature that adding either type of TLR to an otherwise two-dimensional laminate results in the following advantages: substantially improved compression-after-impact response, considerably increased fracture toughness in Mode I (double cantilever beam) and Mode II (end notch flexure), and severely restricted size and growth of impact damage and edge delamination. TLR has also been used to eliminate catastrophic stiffener disbonding in stiffened structures, and in cocured structures it may be used as a substitute for mechanical fasteners. TLR directly protects the Achilles' heel of laminated composites, that is, delamination. As little as 1% volume of TLR significantly alters the mechanical response of laminates. While there is a significant volume of literature, which is reviewed in this paper, there is still a very incomplete understanding of the mechanisms and parameters affecting those mechanisms responsible for the significant changes in the laminate response.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"1 1","pages":"3-15"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78582506","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: 67