Combined Thermal And Bending Fatigue Of High Temperature Metal Matrix Composites Computational Simulation
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| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 26 |
| Release | : 2018-06-30 |
| Genre | : |
| ISBN | : 9781722103989 |
The nonlinear behavior of a high-temperature metal-matrix composite (HT-MMC) was simulated by using the metal matrix composite analyzer (METCAN) computer code. The simulation started with the fabrication process, proceeded to thermomechanical cyclic loading, and ended with the application of a monotonic load. Classical laminate theory and composite micromechanics and macromechanics are used in METCAN, along with a multifactor interaction model for the constituents behavior. The simulation of the stress-strain behavior from the macromechanical and the micromechanical points of view, as well as the initiation and final failure of the constituents and the plies in the composite, were examined in detail. It was shown that, when the fibers and the matrix were perfectly bonded, the fracture started in the matrix and then propagated with increasing load to the fibers. After the fibers fractured, the composite lost its capacity to carry additional load and fractured. Gotsis, Pascal K. Glenn Research Center RTOP 510-10-01...
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| Total Pages | : 28 |
| Release | : 1991 |
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| Author | : CC. Chamis |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 1996 |
| Genre | : Computational simulations |
| ISBN | : |
A generalized relatively new approach is described for the computational simulation of fatigue behavior of high temperature metal matrix composites (HT-MMCs). This theory is embedded in a specialty-purpose computer code. The effectiveness of the computer code to predict the fatigue behavior of HT-MMCs is demonstrated by applying it to a silicon-fiber/titanium-matrix HT-MMC. Comparative results are shown for mechanical fatigue, thermal fatigue, thermomechanical (in-phase and out-of-phase) fatigue, as well as the effects of oxidizing environments on fatigue life. These results show that the new approach reproduces available experimental data remarkably well.
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| Total Pages | : 702 |
| Release | : 1995 |
| Genre | : Aeronautics |
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| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 30 |
| Release | : 2018-08-16 |
| Genre | : |
| ISBN | : 9781725585409 |
A procedure was developed and is described which can be used to computationally simulate the cyclic behavior of high temperature metal matrix composites (HTMMC) and its degradation effects on the structural response. This procedure consists of HTMMC mechanics coupled with a multifactor interaction constituent material relationship and with an incremental iterative nonlinear analysis. The procedure is implemented in a computer code that can be used to computationally simulate the thermomechanical behavior of HTMMC starting from the fabrication process and proceeding through thermomechanical cycling, accounting for the interface/interphase region. Results show that combined thermal/mechanical cycling, the interphase, and in situ matrix properties have significant effects on the structural integrity of HTMMC. Chamis, C. C. and Murthy, P. L. N. and Hopkins, D. A. Glenn Research Center NASA-TM-102115, E-4888, NAS 1.15:102115 RTOP 505-63-11...
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| Total Pages | : 22 |
| Release | : 1991 |
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| Author | : Christos C. Chamis |
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| Total Pages | : |
| Release | : 1989 |
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| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 34 |
| Release | : 2018-06-24 |
| Genre | : |
| ISBN | : 9781721821488 |
The paper describes an effective formal method that can be used to simulate design properties for composites that is inclusive of all the effects that influence those properties. This effective simulation method is integrated computer codes that include composite micromechanics, composite macromechanics, laminate theory, structural analysis, and multi-factor interaction model. Demonstration of the method includes sample examples for static, thermal, and fracture reliability for a unidirectional metal matrix composite as well as rupture strength and fatigue strength for a high temperature super alloy. Typical results obtained for a unidirectional composite show that the thermal properties are more sensitive to internal local damage, the longitudinal properties degrade slowly with temperature, the transverse and shear properties degrade rapidly with temperature as do rupture strength and fatigue strength for super alloys. Chamis, Christos C. and Abumeri, Galib H. Glenn Research Center NASA/TM-2006-214111, E-15445
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| Total Pages | : 24 |
| Release | : 1990 |
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| Author | : Christos C. Chamis |
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| Total Pages | : 13 |
| Release | : 1989 |
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