Download or read book Ceramic Life Prediction Methodology Final Report written by L. R. Swank and published by . This book was released on 1986 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Life Prediction Methodology for Ceramic Components of Advanced Heat Engines Phase 1 written by and published by . This book was released on 1995 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emphasis of this program is to develop and demonstrate ceramics life prediction methods, including fast fracture, stress rupture, creep, oxidation, and nondestructive evaluation. Significant advancements were made in these methods and their predictive capabilities successfully demonstrated.
Download or read book Life Prediction Methodologies and Data for Ceramic Materials written by S. F. Duffy and published by ASTM International. This book was released on 1994 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cleaver for President of the United States of America written by and published by . This book was released on 1968 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Toughened Ceramics Life Prediction Final Technical Report written by and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research was to understand the room temperature and high temperature behavior of brittle materials such as in situ toughened ceramics, glasses and intermetallics as the basis for developing life prediction and test methodologies. A major objective was to understand the relationship between microstructure and mechanical behavior within the bounds of a limited number of materials. A second major objective was to determine the behavior as a function of time and temperature. Specifically, the room temperature and elevated strength and reliability, the fracture toughness, slow crack growth and the creep behavior. These results will provide input for parallel materials development and design methodology programs. Resultant design codes will be verified. A summary of the accomplishments that occurred under this program is given.
Download or read book Life Prediction Methodology for Ceramic Components of Advanced Vehicular Heat Engines Volume 3 Appendices 3 4 5 6 and 7 Final Report written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The appendices contain: dynamic fatigue testing of MOR specimens in air at Allison from 1000 to 1400 C; dynamic fatigue testing of MOR specimens in air and Ar at ORNL from 1000-1400 C; dynamic fatigue testing of button-head tensile specimens in air at Southern Research Institute; tensile creep curves for dogbone specimens tested at the National Institute of Science and Technology; and oxidation behavior of PY-6 Si nitride between 1000-1400 C in air.
Download or read book Ceramic Life Prediction Methodology written by and published by . This book was released on 1986 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this program was to establish a method for predicting the lifetime reliability of structural ceramic materials in high temperature applications. Fast fracture and stress rupture data were collected on two materials, a sintered silicon nitride and a lithium-aluminum-silicate. The fast fracture data was presented graphically in the form of Weibull plots of percent failed versus failure stress. Stress rupture results were presented in tabular form. Photo micrographs were presented to illustrate the fracture surfaces of fast fracture and stress rupture failures. A program of specimen development was conducted. The objective of the program was to develop processing techniques to make it possible to fabricate integral shaft spin disks suitable for hot spin testing as stress rupture specimens. The hot spin disk stress rupture results were to be used to correlate experimental time dependent failure results with analytical time dependent failure results.
Download or read book Ceramic Life Prediction Methodology Analytical Assessment of Selected Component Data written by L. R. Swank and published by . This book was released on 1982 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete set of thermal conditions, mechanical loads, geometry as well as thermal, elastic, fast fracture, and time dependent material properties was furnished by AMMRC for the hub of a gas turbine disc. A finite element computer model was prepared for the disc from this data. The temperature and stress distributions, the fast fracture and the time dependent reliabilities were calculated. The results were presented in iso-stress and iso-thermal plots and in graphical data. (Author).
Download or read book Life Prediction Methodology for Ceramic Components of Advanced Vehicular Heat Engines Volume 1 Final Report written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the major challenges involved in the use of ceramic materials is ensuring adequate strength and durability. This activity has developed methodology which can be used during the design phase to predict the structural behavior of ceramic components. The effort involved the characterization of injection molded and hot isostatic pressed (HIPed) PY-6 silicon nitride, the development of nondestructive evaluation (NDE) technology, and the development of analytical life prediction methodology. Four failure modes are addressed: fast fracture, slow crack growth, creep, and oxidation. The techniques deal with failures initiating at the surface as well as internal to the component. The life prediction methodology for fast fracture and slow crack growth have been verified using a variety of confirmatory tests. The verification tests were conducted at room and elevated temperatures up to a maximum of 1371[degrees]C. The tests involved (1) flat circular disks subjected to bending stresses and (2) high speed rotating spin disks. Reasonable correlation was achieved for a variety of test conditions and failure mechanisms. The predictions associated with surface failures proved to be optimistic, requiring re-evaluation of the components' initial fast fracture strengths. Correlation was achieved for the spin disks which failed in fast fracture from internal flaws. Time dependent elevated temperature slow crack growth spin disk failures were also successfully predicted.
Download or read book Life Prediction Methodology for Ceramic Components of Advanced Heat Engines Phase 1 written by and published by . This book was released on 1995 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the following appendices: ceramic test specimen drawings and schematics, mixed-mode and biaxial stress fracture of structural ceramics for advanced vehicular heat engines (U. Utah), mode I/mode II fracture toughness and tension/torsion fracture strength of NT154 Si nitride (Brown U.), summary of strength test results and fractography, fractography photographs, derivations of statistical models, Weibull strength plots for fast fracture test specimens, and size functions.
Download or read book Methodology for Ceramic Life Prediction and Related Proof Testing written by R. K. Govila and published by . This book was released on 1978 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This program consists of a basic study using two potential high temperature ceramic materials, namely, hot pressed silicon nitride NC132 (Norton) and hot pressed silicon nitride made with 3.5 wt. percent MgO (Ford material) to determine the statistical and time dependent strength characteristics related to the presence of subcritical crack growth. The data will be used to correlate analytical ceramic life prediction and possibly verify with experimental results obtained from simple tensile stress rupture tests. (Author).
Download or read book Ceramic Life Prediction Methodology Hot Spin Disc Life Program written by R. R. Baker and published by . This book was released on 1982 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: A rotating disc was designed to fail due to time dependent mechanisms. Several discs were fabricated and a previously existing test rig was developed to test the discs at the design conditions. A successful calibration test was conducted at the design condition of 2300 deg F rim temperature and 50,000 rpm. The disc failed after eight and one-half hours of steady state testing indicating that the design was successful, since the failure was due to a time dependent mechanism. (Author).
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Properties and Performance of Ceramic Composite Components written by and published by . This book was released on 1998 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the Fossil Energy Advanced Research and Technology Development (AR and TD) Materials Program is to conduct research and development on materials for longer-term fossil energy applications as well as for generic needs of various fossil fuel technologies. The research program of the Materials Response Group at Virginia Tech addresses the need for reliable and durable structural ceramic composites to perform in high temperature environments. The research effort provides an experimental and analytical basis for the transition from properties of materials to performance of actual component structures. Phases 1 and 2 of the present program focused on the development of test capabilities, initial studies of component mechanical response under various conditions and the development of a life prediction methodology. These efforts have been described in previous reports. This report summarizes the major tasks completed under Phases 3 and 4 of the project. Overall, the authors have made significant progress in a broad spectrum of tasks in this program. Their efforts have encompassed component evaluation, assessment of new SiC-based composites with improved high-temperature potential, development of oxide coating materials for SiC, and the extension and development of new models for predicting the durability of composite components under specific operating conditions for various CMC applications. Each of these areas of work is an important area for achieving the ultimate goal of usable SiC-based composites in high-temperature corrosive environments typical of fossil energy applications.
Download or read book Computational Life Prediction Methodology for Mechanical Systems Using Dynamic Simulation Finite Element Analysis and Fatigue Life Prediction Methods written by Woon Kyung Baek and published by . This book was released on 1990 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Methodology to Predict Creep Life for Advanced Ceramics Using Continuum Damage Mechanics written by J. Chuang and published by . This book was released on 1994 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A methodology is proposed to estimate creep rupture life for advanced ceramics such as continuous fiber reinforced ceramic matrix composites (CFCMC). Based on the premise that the damage pattern takes the form of a heterogeneous distribution of grain boundary cavities in the majority of creep life, a damage parameter is incorporated in various creep strain rate equations. The resulting constitutive equations for creep strain and accumulated damage are cast in terms of stress, and other affinities. It is pointed out that these affinities can be derived from a scalar creep potential in nonequilibrium thermodynamics. The evolutionary laws are formulated based on many micro-mechanical models. The time-dependent reliability or hazard rate for a Sic is then established by damage mechanics with Weibull analysis. A unit cell model is presented for predicting life of a uni-directional CFCMC subjected to a constant far-field stress. A system of coupled first order ordinary differential equations is derived from which the evolution of creep damage can be solved giving the rupture life. It is shown that the stress dependence on the lifetime is very sensitive to the type of damage mechanisms active at the microstructural level.
