An approximate method is developed for comparing various fiber configurations in a composite structure with the objective of achieving optimal resistance to creep failure. The class of composite structures addressed has a single family of long or continuous strong fibers embedded in a creeping matrix material, e.g., a polymer, metal, etc. Thus, the structure is locally transversely isotropic with the fiber orientation generally varying throughout the structure. The proposed method, intended as an early design tool, is based on an upper bound on creep rupture time and an associated representative failure stress. The latter is evaluated and compared for different fiber configurations, thereby identifying that with optimal creep rupture resistance. This approach allows a substantial saving in computational time by avoiding a detailed analysis of the actual failure process. Application is made to a fiber-reinforced thick-walled cylindrical pressure vessel.
Optimal Fiber Orientation in Locally Transversely Isotropic Creeping Structures
Contributed by the Applied Mechanics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF APPLIED MECHANICS. Manuscript received by the ASME Applied Mechanics Division, Jan. 12, 1999; final revision, Aug. 1, 2000. Associate Editor: I. M. Daniel. Discussion on the paper should be addressed to the Editor, Professor Lewis T. Wheeler, Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4792, and will be accepted until four months after final publication of the paper itself in the ASME JOURNAL OF APPLIED MECHANICS.
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Robinson , D. N., and Binienda, W. K. (August 1, 2000). "Optimal Fiber Orientation in Locally Transversely Isotropic Creeping Structures ." ASME. J. Appl. Mech. March 2001; 68(2): 213–217. https://doi.org/10.1115/1.1354623
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