发布求助
文献互助 智能选刊 最新文献

Composites and Functionally Graded Materials最新文献

筛选
英文 中文
A Damage Mechanics Based Approach to Durability Assessment of Composite Materials 基于损伤力学的复合材料耐久性评估方法
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0659
R. Talreja
{"title":"A Damage Mechanics Based Approach to Durability Assessment of Composite Materials","authors":"R. Talreja","doi":"10.1115/imece1997-0659","DOIUrl":"https://doi.org/10.1115/imece1997-0659","url":null,"abstract":"\u0000 The conventional way of durability assessment, based on experience with metals and still common in industry, is by fatigue life (S-N) curves, strength degradation curves, creep curves, etc., all of which are empirical and require extensive testing in every case. For composite materials, the cost associated with this approach is high because of the numerous parameters of consituent properties, geometry and architecture involved. Alternative approach is to characterize and analyze damage and its evolution, all of which belong to the field of damage mechanics. This paper will review this approach and the progress made to date, and project what lies ahead.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116729397","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
Direct Observation of Contact Damage Produced by Vickers Indentation in Diamond-Like Films 类金刚石薄膜中维氏压痕产生接触损伤的直接观察
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0675
V. H. Bulsara, S. Chandrasekar, T. Farris
{"title":"Direct Observation of Contact Damage Produced by Vickers Indentation in Diamond-Like Films","authors":"V. H. Bulsara, S. Chandrasekar, T. Farris","doi":"10.1115/imece1997-0675","DOIUrl":"https://doi.org/10.1115/imece1997-0675","url":null,"abstract":"\u0000 An experimental study has been made of film delamination and cracking produced by indentation of diamond-like films deposited on glass substrates. In the indentation experiments, a Vickers indenter was loaded normally against a film surface with the load being kept in the range of 2g to 300g. The contact region was observed and photographed in-situ using a high resolution, optical microscope and video imaging system, while the indentation load-history was measured with a piezo-electric force sensor attached to the indenter. The experiments have enabled detailed observations to be made of the contact damage such as the initiation of film delamination and cracks in the film; the loads at which these events occur and their evolution during loading and unloading; and the ejection of fractured film fragments from the substrate. The implications of these results to characterizing the relative failure resistance of various films and for estimating their cohesive and adhesive strengths are discussed.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"26 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120914459","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
In Situ Observation and Modeling of Damage Modes in Cross-Ply Ceramic Matrix Composites 交叉层陶瓷基复合材料损伤模式的原位观察与建模
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0699
R. Kim, G. Tandon
{"title":"In Situ Observation and Modeling of Damage Modes in Cross-Ply Ceramic Matrix Composites","authors":"R. Kim, G. Tandon","doi":"10.1115/imece1997-0699","DOIUrl":"https://doi.org/10.1115/imece1997-0699","url":null,"abstract":"\u0000 Ceramic-matrix composites generally exhibit matrix and/or interface damage well before final failure because of the low strain capability of the brittle matrix and weak interfacial bonding. These damages have a significant influence on the stress-strain behavior as well as on the ultimate strength of the composite. The failure process in a multidirectional laminate is further complicated by its dependence on ply orientations and stacking sequence Reported in this paper are the results of both analytical and experimental investigations carried out in an attempt to understand the initiation and propagation of damage in a [0/90]3S cross-ply laminate. A glass-ceramic matrix composite reinforced with silicon carbide (Nicalon) fibers is investigated at room temperature under uniaxial tensile loading. The initiation and propagation of interfacial debonding, microcracking, and fiber breaks were observed in situ, under applied load using a specially built loading device. The observed damage modes were then incorporated into existing micromechanical models to predict the laminate stress-strain behavior and compared with the experimental measurements.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"7 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116908351","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
Green’s Function Approach to the Analysis of Functionally Graded Materials 功能梯度材料的格林函数分析方法
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0647
S. Nomura, D. Sheahen
{"title":"Green’s Function Approach to the Analysis of Functionally Graded Materials","authors":"S. Nomura, D. Sheahen","doi":"10.1115/imece1997-0647","DOIUrl":"https://doi.org/10.1115/imece1997-0647","url":null,"abstract":"\u0000 A micromechanical approach is adopted to systematically obtain numerical Green’s function for functionally graded materials (FGMs) which enables expressing thermomechanical fields in FGMs as a convolution type of integrals between the Green’s function and a source function. The numerical Green’s function is sought by the eigenfunction expansion method. Computer algebra systems are essential to derive admissible functions that satisfy the given boundary conditions and manipulation of the algebra involved. Using the Green’s function for FGMs, physical fields in FGMs can be expressed semi-analytically while retaining all the relevant parameters. In addition, any change in boundary conditions such as temperature can be readily reflected without incurring the entire recalculation.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123198164","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
Transport in Fibrous Battery Electrode Substrates 纤维电池电极衬底中的传输
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0679
A. Sastry, X. Cheng, S. Choi
{"title":"Transport in Fibrous Battery Electrode Substrates","authors":"A. Sastry, X. Cheng, S. Choi","doi":"10.1115/imece1997-0679","DOIUrl":"https://doi.org/10.1115/imece1997-0679","url":null,"abstract":"\u0000 Advanced fibrous electrode substrates for use as substrates for the nickel electrodes in NiMH automotive cells are being studied analytically and experimentally. The electrodes must resist local failures under hundreds of charge/discharge cycles, during which these fibrous networks (impregnated with active material) are subjected to swelling loads induced by the cell electrochemical reaction. These fibrous materials can be effectively used as substrates for chemical reactions because of their combinations of high surface area and high conductivity. It is shown here these materials’ conductivity can be characterized using a statistical technique in conjunction with an adaptation of a classic continuum model. These approaches are presented here, and compared with experimental data on conduction in fibrous media. The new approach provides an efficient way of predicting the gradual loss in performance observed in battery materials.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121356534","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
Thermal Residual Stress Analyses of Nextel 440/Aluminum Composite Nextel 440/铝复合材料热残余应力分析
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1520/CTR10613J
H. Nayeb-Hashemi, Yimin Yang
{"title":"Thermal Residual Stress Analyses of Nextel 440/Aluminum Composite","authors":"H. Nayeb-Hashemi, Yimin Yang","doi":"10.1520/CTR10613J","DOIUrl":"https://doi.org/10.1520/CTR10613J","url":null,"abstract":"\u0000 Finite element analyses were performed in order to evaluate the residual stresses developed during fabrication process of the Nextel 440/Al-6061 composite. The Nextel 440 fiber has a square section with two half circle attached to the opposite sides geometry. The purpose of the analyses was to find out the effect of fiber orientation and fiber spacing on the thermal residual stresses in the composite after the composite was cooled down to room temperature. It was found that high compressive stresses developed between two fibers and the absolute value of the compressive stresses increased as the two fibers approached each other. However, significant tensile stresses developed between fibers once the two fibers touched each other. The transition from compression to tension could be explained by considering the force balance between contacting fibers. It seems that the residual stresses around fibers are not significantly affected by the boundary conditions of the unit cell models. But the effect of the fibers on the thermal residual stresses of the matrix is seen all over the matrix material. The normal stresses on the fiber/matrix interface is higher when the two fibers are orientated at 45 degrees to each other, than those when the two fibers are orientated at zero degree to each other. The normal stress at the fiber/matrix interface for this fiber geometry was higher compared to that would have developed if round fibers were used.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125340317","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
Densification in Heterogeneous Powder Mixtures by Creep 非均相粉末混合物的蠕变致密化
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0648
A. Zavaliangos
{"title":"Densification in Heterogeneous Powder Mixtures by Creep","authors":"A. Zavaliangos","doi":"10.1115/imece1997-0648","DOIUrl":"https://doi.org/10.1115/imece1997-0648","url":null,"abstract":"\u0000 Successful preparation of functionally gradient materials by powder metallurgy requires usually the application of external pressure. Therefore the densification of two component mixtures under pressure needs to be understood. In this paper we study the densification of a two phase powder mixture with the two constituents deforming by power law creep. A theoretical framework is presented and various aspects of the model are discussed.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126038058","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
Experimental and Numerical Analysis of Ceramics With Microcracking 陶瓷微裂纹的实验与数值分析
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0702
Gang Yin, Ling Xu, Lin Jiang
{"title":"Experimental and Numerical Analysis of Ceramics With Microcracking","authors":"Gang Yin, Ling Xu, Lin Jiang","doi":"10.1115/imece1997-0702","DOIUrl":"https://doi.org/10.1115/imece1997-0702","url":null,"abstract":"\u0000 The application of ceramic materials in engineering structure has increased significantly for their outstanding hardness and yield stress under compressive loading. However, fracture behavior of ceramic materials is closely related to microcracking. Continuum damage mechanics is considered as a powerful theoretical framework. It is fairly difficult to obtain analytically as well as experimentally evolution equations for ceramic with microcracking. In the present study, an effective computational procedure is employed in a dynamic fracture analysis of ceramic materials with microcracking. The computational analysis is carried out for simulation of fracture experiment using notched specimens. This procedure can be used for better interpretation of experimental data as well as fracture simulations of complex structural models. Additionally, ceramic specimen is applied to the finite element analysis of microcracking near the microcrack-tip in a tensile stress field. The simulations were not only consistent with the experiments, but also revealed a possible damage mechanism which helps to explain the experimental data.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121863694","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
Statistics of Strength of Elastic-Brittle Composite Materials 弹脆复合材料强度统计
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0685
M. Ostoja-Starzewski, K. Alzebdeh, I. Jasiuk
{"title":"Statistics of Strength of Elastic-Brittle Composite Materials","authors":"M. Ostoja-Starzewski, K. Alzebdeh, I. Jasiuk","doi":"10.1115/imece1997-0685","DOIUrl":"https://doi.org/10.1115/imece1997-0685","url":null,"abstract":"\u0000 We study crack patterns and effective stress-strain response in unidirectional fiber-matrix composites subjected to out-of-plane and in-plane loading. The fibers are aligned in the longitudinal direction and arranged randomly, with no overlap, in the transverse plane. The fibers and the matrix are isotropic and elastic-brittle, which allows a parametrization of a wide range of composites in terms of a stiffness ratio and a strain-to-failure ratio. The analysis is carried out numerically using very fine two-dimensional spring networks permitting simulation of the crack initiation and propagation by sequentially removing bonds which exceed a local fracture criterion. Particular attention is given to the effects of scale and geometric randomness in these composites. We consider several “windows of observation” (scales) and study crack patterns, types of constitutive responses, and statistics of the corresponding scale dependent effective elastic stiffness and strength of such composites.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127582609","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
Plasma Spraying of Functionally Graded NiCoCrAlY/Yttria Stabilized ZrO2 Coatings Using Composite Powders 用复合粉末等离子喷涂功能梯度NiCoCrAlY/ ytria稳定ZrO2涂层
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0654
K. Khor, Y. Gu, Z. Dong, T. Srivatsan
{"title":"Plasma Spraying of Functionally Graded NiCoCrAlY/Yttria Stabilized ZrO2 Coatings Using Composite Powders","authors":"K. Khor, Y. Gu, Z. Dong, T. Srivatsan","doi":"10.1115/imece1997-0654","DOIUrl":"https://doi.org/10.1115/imece1997-0654","url":null,"abstract":"\u0000 Pre-alloyed, plasma spheroidized powders were used as feedstock in the plasma spraying of functionally graded ZrO2/NiCoCrAlY coatings. The advantage of using pre-alloyed powders was to ensure chemical homogeneity and promote uniform density along the graded layers, and these pre-alloyed powders could be successfully used to prepare the different inter-layers of functionally graded coatings. The microstructure, density and microhardness changed gradiently in the ZrO2/NiCoCrAlY coatings. The bond strength of ZrO2/NiCoCrAlY coatings with different graded layers was measured. Results showed that for as-sprayed coatings with the same thickness, the bond strength increased with the number of graded layers. The bond strength of the coatings with five graded layers was about twice as high as that of the duplex coatings because of the significant reduction of the residual stress in the coatings. Experimental results also showed that the bond strength of as-sprayed coating increased significantly after hot isostatic press (HIP) and vacuum heat treatments, and the reason can be attributed to the densification of the microstructure, the decrease of defects in the coatings, inter-diffusion between layers and further reduction in the residual thermal stress.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"46 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122921468","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信