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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 11 (1975), S. 409-429 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On applique la méthode d'analyse par lignes aux équations d'équilibre élastique de Navier-Cauchy pour calculer la distribution des déplacements dans divers corps comportant des fissures. L'application de la méthode à ces équations conduit à des couples d'équations différentielles ordinaires, dont les solutions sont obtenues pour des séries de lignes disposées dans une région discrète. Lorsqu'il n'est pas possible de découpler les équations et leurs conditions aux limites, le recours à une procédure d'approximation successive permet de trouver une solution analytique aux équations différentielles ordinaires. Les résultats obtenus montrent les possibilités remarquables de l'emploi de la méthode pour l'analyse tridimensionnelle de solides à géométrie finie, et suggèrent des extensions possibles à l'étude du comportement des matériaux non linéaires.
    Notes: Abstract The line method of analysis is applied to the Navier-Cauchy equations of elastic equilibrium to calculate the displacement distributions in various bodies containing cracks. The application of this method to these equations leads to coupled sets of simultaneous ordinary differential equations whose solutions are obtained along sets of lines in a discretized region. When decoupling the equations and their boundary conditions is not possible, the use of a successive approximation procedure permits the analytical solution of the resulting ordinary differential equations. The results obtained show a considerable potential for using this method in the three-dimensional analysis of finite geometry solids and suggest a possible extension of this technique to nonlinear material behavior.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1989-03-01
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Wiley on behalf of American Ceramic Society.
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  • 3
    Publication Date: 2011-12-09
    Description: The mechanical behavior of continuous fiber reinforced SiC/RBSN composites with strong and weak interface characteristics is evaluated. Both catastrophic and noncatastrophic failures are observed in tensile specimens. Effects of fiber/matrix interface debonding (splitting) parallel to the fibers are discussed. Micromechanical models incorporating residual stresses to calculate the critical matrix cracking strength, ultimate strength and work of pull-out are reviewed and used to predict composite response. Experimental results are compared to analytical predictions.
    Keywords: COMPOSITE MATERIALS
    Type: In: Mechanics of composites at elevated and cryogenic temperatures; Proceedings of the Symposium, ASME Applied Mechanics Conference, Columbus, OH, June 16-19, 1991 (A93-32451 12-39); p. 217-229.
    Format: text
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  • 4
    Publication Date: 2011-08-24
    Description: Nicalon silicon carbide 3D yarn with silicon carbide matrix composites made through a chemical vapor infiltration (CVI) process were investigated under tensile and flexural loading at 23, 1200 and 1550 C in air. The effectiveness of a chemical vapor deposition (CVD) SiC surface coating was also evaluated in severe oxidizing environment. Acoustic emission sensors and in situ optical microscopy were used at room temperature to monitor the failure mechanisms. It is shown that the level of tensile stress at which nonlinear behavior begins is not drastically reduced at 1200 and 1550 C when composites were protected by a SiC surface coating. Extensive fiber pull-out was observed only in the 1550 C specimen. Similar behaviors were also found in flexural specimens.
    Keywords: COMPOSITE MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 13; 7-8,
    Format: text
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  • 5
    Publication Date: 2011-08-23
    Description: Strength of three continuous fiber-reinforced ceramic composites, including SiC/CAS-11, SiC/MAS-5 and SiC/SiC, was determined as a function of test rate in air at 1100 - 1200 C. All three composite materials exhibited a strong dependency of strength on test rate, similar to the behavior observed in many advanced monolithic ceramics at elevated temperatures. The application of the preloading technique as well as the prediction of life from one loading configuration (constant stress-rate) to another (constant stress loading) suggested that the overall macroscopic failure mechanism of the composites would be the one governed by a power-law tyw of damage evolution/accumulation, analogous to slow crack growth commonly observed in advanced monolithic ceramics. It was further found that constant stress-rate testing could be used as an alternative to life prediction test methodology even for the composite materials at least for the short range of lifetime.
    Keywords: Nonmetallic Materials
    Type: Ceramic Engineering and Science Proceedings; Volume 22; 597-606
    Format: text
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  • 6
    Publication Date: 2011-08-24
    Description: One of the primary pacing items for realizing the full potential of ceramic-based structural components is the development of new design methods and protocols. The focus here is on low temperature, fast-fracture analysis of monolithic, whisker-toughened, laminated, and woven ceramic composites. A number of design models and criteria are highlighted. Public domain computer algorithms, which aid engineers in predicting the fast-fracture reliability of structural components, are mentioned. Emphasis is not placed on evaluating the models, but instead is focused on the issues relevant to the current state of the art.
    Keywords: COMPOSITE MATERIALS
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  • 7
    Publication Date: 2011-08-23
    Description: The slow crack growth parameters of a hot-pressed silicon nitride were determined at 1200 and 1300 C in air by statically, dynamically and cyclicly loading bend specimens. The fatigue parameters were estimated using the recently developed CARES/Life computer code. Good agreement exists between the flexural results. However, fatigue susceptibility under static uniaxial tensile loading, reported elsewhere, was greater than in flexure. Cyclic flexural loading resulted in the lowest apparent flexural fatigue susceptibility.
    Keywords: Metals and Metallic Materials
    Type: Ceramic Engineering and Science Proceedings; Volume 15; 597-604
    Format: text
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  • 8
    Publication Date: 2011-08-19
    Description: NASA-Lewis has developed a public-domain computer program, designated 'Ceramic Analysis and Reliability Evaluation of Structures' (CARES) for calculating the fast-fracture reliability of macroscopically isotropic ceramic components subjected to the complex thermomechanical loadings typical of heat engines. The design methodology employed by CARES encompasses linear elastic fracture mechanics theory, extreme value statistics, and material microstructures; component integrity is conceived as a function of the entire field solution of the stresses, rather than being based solely on the most highly stressed point.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: American Ceramic Society Bulletin (ISSN 0002-7812); 68; 2064-207
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  • 9
    Publication Date: 2011-08-19
    Description: The dynamic fatigue behavior of 30 vol pct SiC whisker-reinforced silicon nitride was determined in flexure as a function of temperature from 1100 to 1300 C in an air environment. The fatigue susceptibility parameter n decreased from 88.1 to 20.1 with increasing temperature from 1100 to 1300 C. A transition in the dynamic fatigue curve occurred at a lowest stressing rate of 2 MPa/min at a temperature of 1300 C, resulting in a considerably lower value of n = 5.8. This transition was primarily due to creep that was enhanced by a combination of high temperature and very slow deformation rate. The fatigue resistance of natural flaws at 1100 C was found to be greater than that of artificial flaws produced by indentation.
    Keywords: COMPOSITE MATERIALS
    Type: Ceramic Engineering and Science Proceedings (ISSN 0196-6219); 12; 1524-153
    Format: text
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  • 10
    Publication Date: 2011-08-19
    Description: A structural ceramic analysis and reliability evaluation code has recently been developed encompassing volume and surface flaw induced fracture, modeled by the two-parameter Weibull probability density function. A segment of the software involves computing the Weibull polydimensional stress state crack density coefficient from uniaxial stress experimental fracture data. The relationship of the polydimensional stress coefficient to the uniaxial stress coefficient is derived for a shear-insensitive material with a random surface flaw population.
    Keywords: STRUCTURAL MECHANICS
    Type: American Ceramic Society, Communications (ISSN 0002-7820); 72; 506
    Format: text
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