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  • 1
    facet.materialart.
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    A model for predicting high-temperature fatigue failure of a W/Cu composite (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The material studied, a tungsten-fiber-reinforced, copper-matrix composite, is a candidate material for rocket nozzle liner applications. It was shown that at high temperatures, fatigue cracks initiate and propagate inside the copper matrix through a process of initiation, growth, and coalescence of grain boundary cavities. The ductile tungsten fibers neck and rupture locally after the surrounding matrix fails, and complete failure of the composite then ensues. A simple fatigue life prediction model is presented for the tungsten/copper composite system.
    Keywords: COMPOSITE MATERIALS
    Type: Structural Integrity and Durability of Reusable Space Propulsion Systems; p 207-218
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Tensile and fatigue behavior of tungsten/copper composites (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Work on W/Cu unidirectional composites was initiated to study the behavior of this ductile-ductile composite system under thermomechanical fatigue and to examine the applicability of fatigue-life prediction methods for thermomechanical fatigue of this metal matrix composite. The first step was to characterize the tensile behavior of four ply, 10 vol. percent W/Cu plates at room and elevated temperatures. Fatigue tests were conducted in load control on 0 degree specimens at 260 C. The maximum cyclic stress was varied but the minimum cyclic stress was kept constant. All tests were performed in vacuum. The strain at failure increased with increasing maximum cyclic stress.
    Keywords: COMPOSITE MATERIALS
    Type: Structural Integrity and Durability of Reusable Space Propulsion Systems; p 25-31
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    High temperature fatigue behavior of tungsten copper composites (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present study investigates the high-temperature fatigue behavior of a 9-v/o tungsten fiber-reinforced copper matrix composite. Load-controlled isothermal fatigue at 260 and 560 C and thermomechanical fatigue (TMF) experiments, both in-phase and out-of-phase between 260 and 560 C, were performed. The stress-strain response under all conditions displayed considerable inelasticity. Strain ratchetting was observed during all the fatigue experiments. For the isothermal fatigue and in-phase TMF tests, the ratchetting was always in a tensile direction, continuing until failure. The ratchetting during the out-of-phase TMF test shifted from a tensile to a compressive direction. For all cases, the fatigue lives were found to be controlled by the damage of the copper matrix. On a stress basis, TMF loading substantially reduced lives relative to isothermal cycling.
    Keywords: COMPOSITE MATERIALS
    Type: TMS Fall Meeting; Oct 01, 1989 - Oct 05, 1989; Indianapolis, IN; United States
    Format: text
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    NASA TECHNICAL REPORTS
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