Transverse yielding, creep and matrix flow past the fibers in metal matrix composites
Conference
·
OSTI ID:175124
- Univ. of California, Santa Barbara, CA (United States)
Metal matrix composites (MMC) reinforced by continuous fibers are used for engineering applications at both low and high temperature environments. Many structural components such as turbine rings or elements with joints may be subjected to nonuniform transverse stress states, such as in a circumferential ring subjected to radial turbine blade loads and centrifugal inertial loads. These components are circumiferentially reinforced and transverse stress gradients will develop in them. This will cause the matrix to yield, creep and perhaps to flow past the fibers. The fibers will be constrained by elastic straining and therefore, unless they break, they will be anchored in place relative to a matrix which can flow past. To maintain structural integrity, metal matrix composites must have reasonable transverse strength and transverse stiffness as well as good longitudinal properties. It is therefore essential to understand the overall mechanical behavior and to develop a set of mechanical constitutive equations -that adequately describe the material response of metal matrix composites in the transverse direction. In the present work, cell models are used to analyze the effect of stress gradients on the transverse behavior of the metal matrix composites. Systematic results are given for the influence of the fiber volume fraction, fiber arrangement and stress gradients. The yield surface in terms of mean stress and stress gradient is calculated from this analysis. It is found that the transverse limit strengths are sensitive to the transverse stress gradient across the cell. In addition, a constitutive relationship accounting for matrix plastic training, creep and matrix flow past the fibers is developed.
- OSTI ID:
- 175124
- Report Number(s):
- CONF-950686--
- Country of Publication:
- United States
- Language:
- English
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