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Evaluation of Stress Redistribution and Notch Sensitivity in Ceramic Matrix Composites (CMCs) 陶瓷基复合材料(CMCs)应力重分布及缺口敏感性评价
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0666
M. Roberts, T. Mackin
{"title":"Evaluation of Stress Redistribution and Notch Sensitivity in Ceramic Matrix Composites (CMCs)","authors":"M. Roberts, T. Mackin","doi":"10.1115/imece1997-0666","DOIUrl":"https://doi.org/10.1115/imece1997-0666","url":null,"abstract":"\u0000 Damage tolerance, which depends upon inelastic mechanisms, is crucial to the general utility of ceramic matrix composites (CMCs). Recent experiments have confirmed several damage mechanisms and revealed that stress redistribution does occur in CMCs. The current composite paradigm relies on fiber coatings to achieve this damage tolerance. More recently, an Al2O3/ Al2O3 CMC was developed which attains damage tolerance through the use of a porous matrix. To evaluate this all-oxide material, tensile experiments were conducted on double edge-notched test specimens. An infrared imaging technique, known as thermoelastic stress analysis, was used to classify the damage mechanism and measure the extent of stress redistribution in double edge-notched specimens. Results indicate that the subject alumina/alumina composite exhibits a measurable degree of ductility by developing shear band damage zones.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"13 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":"127129835","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
A New Multiparameter Approach to the Characterization of Mechanical Properties of Ceramics 一种表征陶瓷力学性能的多参数新方法
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0696
A. Soboyejo, W. Soboyejo
{"title":"A New Multiparameter Approach to the Characterization of Mechanical Properties of Ceramics","authors":"A. Soboyejo, W. Soboyejo","doi":"10.1115/imece1997-0696","DOIUrl":"https://doi.org/10.1115/imece1997-0696","url":null,"abstract":"\u0000 This technical paper describes a new multiparameter approach, consisting of deterministic and mechanistically based characterization of the mechanical properties of structural ceramics; and the appropriate probabilistic models, from which the failure probabilities and the reliabilities of engineering components made with such structural materials can be evaluated, for structural, mechanical and aerospace engineering design applications. For example, the practical application of the methodology developed can be demonstrated by the actual characterization of the mechanical properties of some new structural ceramics which are being developed for high-temperature engineering design applications.","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":"127547805","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
Stress Redistribution and Notch Sensitivity in Ceramic Matrix Composites (CMCs) 陶瓷基复合材料(CMCs)的应力重分布和缺口灵敏度
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0683
T. Mackin, M. Roberts, D. Anderson
{"title":"Stress Redistribution and Notch Sensitivity in Ceramic Matrix Composites (CMCs)","authors":"T. Mackin, M. Roberts, D. Anderson","doi":"10.1115/imece1997-0683","DOIUrl":"https://doi.org/10.1115/imece1997-0683","url":null,"abstract":"\u0000 A new generation of relatively ‘ductile’ CMCs is being developed that expands the general utility of structural ceramic composites. These new materials rely on inelastic mechanisms such as interface failure, matrix cracking, fiber failure and fiber pullout to redistribute stress away from locations of stress concentration (Evans et al., 1995). The combined effect of these mechanisms can be summarized in three macroscopic damage classifications (Mackin et al., 1995): Class I damage is the development of a single matrix crack bridged by fibers; Class II damage involves the development of multiple cracks in the matrix; and Class III damage involves the development of a shear damage zone. The operative damage mechanism depends upon the composite constituent properties, while the extent of stress redistribution depends upon the damage mechanism.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"1 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":"122637857","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
Microstructure and Residual Stresses in FGMs fgm的微观结构和残余应力
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0651
A. Zavaliangos
{"title":"Microstructure and Residual Stresses in FGMs","authors":"A. Zavaliangos","doi":"10.1115/imece1997-0651","DOIUrl":"https://doi.org/10.1115/imece1997-0651","url":null,"abstract":"\u0000 In this work we present preliminary results on the development of residual stresses due to differential thermal expansion and unloading from hydrostatic pressure that typically occur during the powder metallurgical processing of FGMs. Attention is focused in microstructures where the fractions of the two phases are equal.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"38 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":"122850698","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
Self-Healing Composites Using Embedded Microspheres 使用嵌入微球的自修复复合材料
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0673
D. Jung, A. Hegeman, N. Sottos, P. Geubelle, S. White
{"title":"Self-Healing Composites Using Embedded Microspheres","authors":"D. Jung, A. Hegeman, N. Sottos, P. Geubelle, S. White","doi":"10.1115/imece1997-0673","DOIUrl":"https://doi.org/10.1115/imece1997-0673","url":null,"abstract":"\u0000 A self-repairing polyester matrix composite material is described which utilizes embedded polyoxymethylene urea (PMU) microspheres to store a crack filling agent to be released into the crack and rebond the crack faces. The developed repair mechanism uses naturally occurring functional sites in the polyester matrix network to trigger the repair action. The repair agent is mostly composed of styrene monomers and high molecular weight polystyrene. Microscopic observations of the microsphere/crack interaction are presented. Of particular interest is the process with which the microspheres break and release their content when encountered by a crack. The effects of the microspheres on the stiffness and toughness of the polyester resin are also studied. Using standard tensile samples, the composite elastic modulus has been found to decrease with the volume fraction of microspheres, while the fracture toughness of tapered double cantilever beam (TDCB) specimens is shown to reach a maximum value at approximately 10% volume fraction. Examinations of the fracture surfaces show tails extending from the microspheres, indicating crack pinning and crack front bowing as the primary toughening mechanisms. An enhanced level of adhesion between the microsphere and matrix has been found to decrease the composite fracture toughness and increase the incidence of sphere breakage on the fracture surface.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"91 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":"129575616","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
Raman Investigation and Mechanical Behavior of Zirconia 氧化锆的拉曼研究与力学行为
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0697
G. Gogotsi
{"title":"Raman Investigation and Mechanical Behavior of Zirconia","authors":"G. Gogotsi","doi":"10.1115/imece1997-0697","DOIUrl":"https://doi.org/10.1115/imece1997-0697","url":null,"abstract":"\u0000 Raman microprobe analysis was performed of partially-stabilized ZrO2 ceramics and single crystals using the samples which were preliminary indented with a Vickers indenter at room temperature or subjected to bending at low temperatures. The addition of ferric oxide into Y-PSZ ceramics was found to intensify martensitic phase transformation in it and to enhance its fracture toughness. For single crystals the tetragonal-to-monoclinic phase transformation was found possible at fracture. It was established that inelastic Mg-PSZ ceramics at −50°...−60°C becomes in fact elastic but no relevant changes in Raman spectra were observed. A conclusion was made that further investigations are required to specify the known micromechanisms which govern the behavior of ZrO2 materials under loading.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"53 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":"124078907","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
Failure Mechanism of Metallization Layer of a Multichip Module Substrate 多芯片模块基板金属化层失效机理研究
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0703
Mansur Rastani
{"title":"Failure Mechanism of Metallization Layer of a Multichip Module Substrate","authors":"Mansur Rastani","doi":"10.1115/imece1997-0703","DOIUrl":"https://doi.org/10.1115/imece1997-0703","url":null,"abstract":"\u0000 The work described in this paper concentrates primarily on the multichip module type D. In MCM-D technologies, the interlayer vias have been identified as potential failure sites due to fatigue caused by temperature cycling and the CTE mismatch between the dielectric and metal layers. The selected model for this study uses an MCM-D structure, implementing aluminum-silicon (Al-Si) metallization layers separated by a silicon dioxide (SiO2) interlayer dielectric.\u0000 A 3-D finite element analysis has performed on the model to determine the effect of accelerated temperature cycling and thermal shock. The resulting non-linear, elasto-plastic stress-strain response was obtained, under the von-Mises yield criterion, using PATRAN code. The fatigue life of the via was then estimated and compared with the experimental results.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"12 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":"128022342","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
Crack Initiation in Notched Unidirectional Graphite/Epoxy Composites 缺口单向石墨/环氧复合材料的裂纹萌生
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0668
C. Chow, Fan Yang, H. E. Fang
{"title":"Crack Initiation in Notched Unidirectional Graphite/Epoxy Composites","authors":"C. Chow, Fan Yang, H. E. Fang","doi":"10.1115/imece1997-0668","DOIUrl":"https://doi.org/10.1115/imece1997-0668","url":null,"abstract":"\u0000 The paper describes an investigation examining damage responses and failure characteristics of unidirectional graphite/epoxy composites containing a central circular hole subjected to off-axis uniaxial tension. A recently developed damage mechanics model is extended to determine the progressive damage process around the hole and the effect of such damage on the in-plane behaviors and final failure of the notched composites. The generalized stress and strain constitutive equations and the relationship between the damage variable and material properties are briefly outlined first. The anisotropic mechanical behavior of the composites is investigated by using a nonlinear finite element procedure incorporated with the damage-coupled constitutive equations. As the failure of fiber reinforced composite materials may basically be either fiber dominated or matrix dominated, separate damage criteria are proposed to capture fiber failure and matrix or fiber/matrix interaction failure in unidirectional composites. The damage model is validated by comparing the numerical prediction and experimental data obtained from a Moiré interferometry technique. Preliminary results indicate that the proposed damage model provides an effective alternative method to study progressive failure behavior in unidirectional composites.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"100 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":"131568461","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
Novel Processes for Fabricating Ceramic Composites and Future Outlook for Markets and Applications 陶瓷复合材料的新工艺及其市场应用前景
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0681
L. Sheppard
{"title":"Novel Processes for Fabricating Ceramic Composites and Future Outlook for Markets and Applications","authors":"L. Sheppard","doi":"10.1115/imece1997-0681","DOIUrl":"https://doi.org/10.1115/imece1997-0681","url":null,"abstract":"\u0000 Ceramic matrix composites (CMCs) can be broken down into two major classes: discontinuously reinforced and continuously reinforced. Discontinuously reinforced CMCs consist of a matrix phase (typically alumina or silicon nitride) to which a reinforcing phase (such as silicon carbide particles, platelets or whiskers) is added. This type of CMC is in the early stage of commercialization in applications where wear is a major issue such as cutting tools and extrusion dies.\u0000 Continuous fiber reinforced CMCs consist of an array of continuous ceramic fibers, either uniaxially arrayed, multi-axially arrayed, or woven as a cloth, that are embedded in a ceramic or glass matrix. This type of CMC is currently at the pre-commercial development/application demonstration stage for applications where high temperatures and high stresses occur. Such applications include gas turbine components and heat exchangers.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"23 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":"131243565","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
Damage in Ceramic Matrix Composites With Arbitrary Microstructures 具有任意微结构的陶瓷基复合材料中的损伤
Composites and Functionally Graded Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0698
V. Bulsara, R. Talreja, J. Qu
{"title":"Damage in Ceramic Matrix Composites With Arbitrary Microstructures","authors":"V. Bulsara, R. Talreja, J. Qu","doi":"10.1115/imece1997-0698","DOIUrl":"https://doi.org/10.1115/imece1997-0698","url":null,"abstract":"\u0000 It has been well-recognized that the fiber spatial distribution in a continuous fiber-reinforced (CFR) composite has a significant effect on the transverse behavior of the composite. In this study, quantitative microscopy in conjunction with finite element analysis are used to study the effects of fiber distribution on damage initiation in a unidirectional composite under a uniaxial loading transverse to the fibers.","PeriodicalId":104058,"journal":{"name":"Composites and Functionally Graded Materials","volume":"125 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":"130248156","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
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