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Journal of Composites Technology & Research最新文献

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Refinements to the Mixed-Mode Bending Test for Delamination Toughness 分层韧性混合模弯曲试验的改进
Journal of Composites Technology & Research Pub Date : 2000-09-01 DOI: 10.1520/CTR10961J
R. R. James
{"title":"Refinements to the Mixed-Mode Bending Test for Delamination Toughness","authors":"R. R. James","doi":"10.1520/CTR10961J","DOIUrl":"https://doi.org/10.1520/CTR10961J","url":null,"abstract":"The mixed-mode bending (MMB) test for delamination toughness was first introduced in 1988. This simple test is a combination of the standard Mode I (opening) test and a Mode II (sliding) test. This MMB test has become widely used in the United States and around the world for mixed-mode toughness measurements. Because of the widespread use of this test method, it is being considered for standardization by ASTM Committee D30. This paper discusses several improvements to the original test method. The improvements to the MMB test procedure include an improved method for calculating toughness from the measured test quantities, a more accurate way of setting the mixed-mode ratio to be tested, and the inclusion of a new alignment criterion for improved consistency in measured values.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"38 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89798707","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: 68
Fatigue Life Methodology for Bonded Composite Skin/Stringer Configurations 粘结复合材料蒙皮/弦结构的疲劳寿命方法
Journal of Composites Technology & Research Pub Date : 2000-09-01 DOI: 10.1520/CTR10561J
Ronald Krueger
{"title":"Fatigue Life Methodology for Bonded Composite Skin/Stringer Configurations","authors":"Ronald Krueger","doi":"10.1520/CTR10561J","DOIUrl":"https://doi.org/10.1520/CTR10561J","url":null,"abstract":"A methodology is presented for determining the fatigue life of bonded composite skin/stringer structures based on delamination fatigue characterization data and geometric nonlinear finite element analyses. Results were compared to fatigue tests on stringer flange/skin specimens to verify the approach.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"20 1","pages":"308-331"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85175758","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: 74
A New Compression Test Fixture for Unnotched or Notched Thin Composite Laminates 一种新型无缺口或缺口薄复合材料层压试验夹具
Journal of Composites Technology & Research Pub Date : 2000-07-01 DOI: 10.1520/CTR10633J
Jason D. Bardis, K. Kedward, J. Bish, T. Tsotsis
{"title":"A New Compression Test Fixture for Unnotched or Notched Thin Composite Laminates","authors":"Jason D. Bardis, K. Kedward, J. Bish, T. Tsotsis","doi":"10.1520/CTR10633J","DOIUrl":"https://doi.org/10.1520/CTR10633J","url":null,"abstract":"A new compression fixture suitable for testing relatively thin composite laminates with or without holes or notches is described and evaluated. This UCSB fixture comprises several features of detail that are different from those of the existing fixtures, such as the large, well-established Supplies of Advanced Composite Materials Association (SACMA) fixture. Both a description and a rationale for such features are included together with compressive strength data for notched and unnotched carbon fiber reinforced polymer matrix composite (PMC) laminates obtained using the UCSB fixture. Comparisons drawn between open hole compression (OHC) strengths for quasi-isotropic specimens tested with the UCSB fixture and with the SACMA fixture are shown to produce equivalent values. The series of experiments on OHC strength discussed herein indicated that the maximum strength values were grouped within 6% of the highest value for each test group.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"22 1","pages":"136-145"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85314763","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: 7
Scaling of First-Ply Failure and Strength in [+ϑ n /−ϑ/−ϑ n /90/90 2n ] s Laminates: Experiments and Predictions [+°n /−°n /−°n /90/90 2n] s层压板第一层破坏和强度的标度:实验和预测
Journal of Composites Technology & Research Pub Date : 2000-07-01 DOI: 10.1520/CTR10635J
J. Lavoie, J. Morton
{"title":"Scaling of First-Ply Failure and Strength in [+ϑ n /−ϑ/−ϑ n /90/90 2n ] s Laminates: Experiments and Predictions","authors":"J. Lavoie, J. Morton","doi":"10.1520/CTR10635J","DOIUrl":"https://doi.org/10.1520/CTR10635J","url":null,"abstract":"An experimental investigation of first-ply failure and strength was conducted on ply-level scaled carbon/epoxy composite laminates having a stacking sequence of [+ϑn/−ϑ/−ϑn/90/902n]s where the constraint ply angle, ϑ, was varied from 0 to 75°, and where the constraint ply angle, ϑ, was varied from 0 to 75°, and n varied from 1 to 4. First-ply failure was shown to depend on the level of constraint and the scale factor, n. The strain energy release rate for matrix microcracking was computed from first-ply failure data of the [02/902]s laminate. Then, first-ply failure for all other layups was predicted using a numerical model that accounted for both constraint and size. Tensile strength was predicted using a strain energy release rate model for delamination of surface angle plies. A delamination energy value for each ply angle was calculated from the thinnest (n = 1) laminates to predict strength of the other sizes.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"14 1","pages":"153-160"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75813115","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
Cylindrical Indentation of Orthotropic Laminates on Elastic Foundations 弹性地基上正交各向异性层压板的圆柱压痕
Journal of Composites Technology & Research Pub Date : 2000-07-01 DOI: 10.1520/CTR10632J
C. Chen
{"title":"Cylindrical Indentation of Orthotropic Laminates on Elastic Foundations","authors":"C. Chen","doi":"10.1520/CTR10632J","DOIUrl":"https://doi.org/10.1520/CTR10632J","url":null,"abstract":"Problems of cylindrical indentation of orthotropic laminated beams on an elastic foundation are studied. Exact solution methods are developed to assess the displacement field for both the simply supported and clamped-ended cases. A numerical iteration algorithm is established to detect the contact length and the associated contact stresses for a prescribed contact load. The induced interlaminar shear stresses through the thickness and the amount of indentation are evaluated subsequently. The objective is to investigate the effects of span, indentor size, end support conditions, and foundation stiffness on the local field responses and load-indentation relationships. The results show that the effects of indentor size and foundation stiffness are significant. A sharp indentor or stiff foundation tends to localize the contact phenomenon, regardless of the span and the end support conditions. On the other hand, the effects of both the boundary condition and span may be prominent if a blunt indentor and a relatively soft foundation are employed.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"101 1","pages":"127-135"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82489717","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
Evaluation of Four Composite Shear Test Methods by Digital Speckle Strain Mapping and Fractographic Analysis 数字散斑应变映射及断口分析对四种复合剪切试验方法的评价
Journal of Composites Technology & Research Pub Date : 2000-07-01 DOI: 10.1520/CTR10636J
L. Melin, J. Neumeister, Kaj Pettersson, Hans Johansson, L. Asp
{"title":"Evaluation of Four Composite Shear Test Methods by Digital Speckle Strain Mapping and Fractographic Analysis","authors":"L. Melin, J. Neumeister, Kaj Pettersson, Hans Johansson, L. Asp","doi":"10.1520/CTR10636J","DOIUrl":"https://doi.org/10.1520/CTR10636J","url":null,"abstract":"Four methods to determine composite interlaminar shear strength (ILSS) are evaluated. In particular, the recently devised inclined double-notch shear test (IDNS) is compared with three existing and ...","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"9 1","pages":"161-172"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80919247","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: 37
Mechanism-Based Modeling of Long-Term Degradation 基于机制的长期退化模型
Journal of Composites Technology & Research Pub Date : 2000-07-01 DOI: 10.1520/CTR10634J
H. McManus, Bj Foch, R. Cunningham
{"title":"Mechanism-Based Modeling of Long-Term Degradation","authors":"H. McManus, Bj Foch, R. Cunningham","doi":"10.1520/CTR10634J","DOIUrl":"https://doi.org/10.1520/CTR10634J","url":null,"abstract":"The use of composites in high-temperature, long-lifetime applications requires a basic understanding of composite degradation mechanisms, advances in analytical capabilities, and accurate accelerated and scaled tests. To advance all of these goals, models are proposed based on a variety of fundamental material mechanisms. Thermal, oxygen, and moisture diffusion, chemical reactions, composite micromechanics, modified laminated plate theory, and fracture mechanics based damage models are used. All models are designed to stay as simple and fundamental as possible. All are coupled, so that interactions between various effects are modeled implicitly. Ongoing efforts at MIT are reviewed here, with some reference to other work, but no attempt is made to do a comprehensive review. Mechanism-based models are yielding an understanding of the mechanisms behind observed degradation phenomena, helping to design accelerated tests, and are the first steps toward a predictive capability.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"134 1","pages":"146-152"},"PeriodicalIF":0.0,"publicationDate":"2000-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86824793","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: 35
Dynamic Elastic Modulus and Vibrational Damping in Nicalon SiCxOy Fiber/Borosilicate Glass Composites: Effects of Thermal Cycling Nicalon SiCxOy纤维/硼硅玻璃复合材料的动态弹性模量和振动阻尼:热循环的影响
Journal of Composites Technology & Research Pub Date : 2000-04-01 DOI: 10.1520/CTR10629J
A. Wolfenden, D. Anthony, K. Chawla, A. Boccaccini
{"title":"Dynamic Elastic Modulus and Vibrational Damping in Nicalon SiCxOy Fiber/Borosilicate Glass Composites: Effects of Thermal Cycling","authors":"A. Wolfenden, D. Anthony, K. Chawla, A. Boccaccini","doi":"10.1520/CTR10629J","DOIUrl":"https://doi.org/10.1520/CTR10629J","url":null,"abstract":"Measurements of dynamic elastic modulus and vibrational damping were made at room temperature for DURAN (a borosilicate glass) and SiCxOy Nicalon™/DURAN (a glass matrix composite). Both sets of materials had been thermal cycled to 500 and 700°C which are below and above the glass transition temperature (Tg = 530°C), respectively. The piezoelectric ultrasonic composite oscillator technique (PUCOT) was used to determine the values of the Young’s modulus and damping. Archimedes’ method was used to find the density of the specimens, and the impulse excitation technique was used to find the flexural modulus. Microstructural examinations were made on selected specimens. The experimental results showed that thermal cycling of the composites below Tg had no distinguishable effect on the density, dynamic Young’s modulus or flexural modulus values; however, an increase in damping of 56% was observed. For thermal cycling above Tg, the density decreased by about 0.5%, the Young’s modulus decreased by 8%, the flexural modulus decreased by 15% and the damping increased by 608%. The simultaneous decrease of elastic modulus and density, and increase of damping in the composites with increasing thermal cycling temperature were analyzed in terms of microstructural degradation due to thermal effects on the matrix, fibers and interfaces.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"22 1","pages":"76-81"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91068566","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
A Two Dimensional Rule-of-Mixtures Micromechanics Model for Woven Fabric Composites 机织复合材料二维混合规律细观力学模型
Journal of Composites Technology & Research Pub Date : 2000-04-01 DOI: 10.1520/CTR10627J
Xin-Lin Gao, S. Mall
{"title":"A Two Dimensional Rule-of-Mixtures Micromechanics Model for Woven Fabric Composites","authors":"Xin-Lin Gao, S. Mall","doi":"10.1520/CTR10627J","DOIUrl":"https://doi.org/10.1520/CTR10627J","url":null,"abstract":"A two-dimensional rule-of-mixtures micromechanics model is presented for planar woven fabric-reinforced composites subjected to in-plane biaxial normal loads. The impregnated warp/fill yarns are treated as orthotropic materials and the interyarn matrix as an isotropic material. The undulations of both warp and fill yarns in two orthogonal directions are considered, and the temperature effects are included. A set of iso-strain conditions, together with the symmetry and periodicity requirements, are employed. The resulting formulation of the present model is simple and more explicit than those of several existing analytical models. This model can deal with different weave patterns, undulation shapes and constituent materials and hence may be viewed as a generic approach. Sample calculations are provided for plain weave, 5-harness and 8-harness satin weave woven composites to demonstrate applications of the present model and to compare with other known results.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"85 1","pages":"60-70"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78220148","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: 18
Numerically Based Compliance Calibration for Steel Frame Assisted Tension Specimen 基于数值的钢架辅助拉伸试样柔度校正
Journal of Composites Technology & Research Pub Date : 2000-04-01 DOI: 10.1520/CTR10631J
S. Yotte, J. Quenisset
{"title":"Numerically Based Compliance Calibration for Steel Frame Assisted Tension Specimen","authors":"S. Yotte, J. Quenisset","doi":"10.1520/CTR10631J","DOIUrl":"https://doi.org/10.1520/CTR10631J","url":null,"abstract":"Recently, a new procedure has been proposed for testing the toughness of thin materials. The test procedure consists of glueing a metal frame onto each specimen face and applying load to the metal frame. This procedure is designed to avoid a Brinel effect on the specimen. Since the characterization of the material toughness requires a compliance function, a finite element calculation is performed in order to evaluate the influence of various material parameters. The deviation of the compliance with the Young’s moduli of the frame and tested materials, and also with the shear modulus, G, is studied. The resulting relationships are used to obtain a definition of the compliance function which takes into account the notch length and a stiffness representative of the tested materials and the glued frame. Comparison between calculated compliances and experimental data exhibits a good agreement.","PeriodicalId":15514,"journal":{"name":"Journal of Composites Technology & Research","volume":"43 1","pages":"91-101"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81734653","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
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