Influence of volumetric fiber content on some matrix damage factors during thermal cycling of tungsten-EI 765 composite

Technical Report · Fri Nov 30 23:00:00 EST 1984

OSTI ID:5618794

Yeremenko, V I

A composite consisting of the chrome-nickel alloy EI 765 plus unidirectional high-purity tungsten fibers was studied. The heating and cooling rates were the same holding time at the maximum temperature varied from 0 to 10 hours. The composite was constantly loaded with a tensile stress of 300 MPa in all cases. Damage rates were calculated on the basis of a deformation model of accumulation of damage. During heating and cooling, creep and plastic deformation of the matrix change significantly in narrow temperature intervals. In the area of reduced plasticity, static damage is slight and not dangerous. Increasing holding time at the maximum temperature causes an increase in almost all types of damage to the matrix, particularly static damage due to creep. Durability of the matrix material increases with increasing distance from the phase boundary with the fibers. Composites with a small volumetric fraction of fibers show a particularly great difference in durability in these areas.

• Research Organization: Joint Publications Research Service, Arlington, VA (USA)
• OSTI ID: 5618794
• Report Number(s): N-85-19097
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360303* -- Composite Materials-- Mechanical Properties-- (-1987)
360304 -- Composite Materials-- Physical Properties-- (-1987)
ALLOYS
CHROMIUM ALLOYS
COMPOSITE MATERIALS
COOLING
DAMAGE
ELEMENTS
FIBERS
HEATING
MATERIALS
METALS
NICKEL ALLOYS
STRESSES
THERMAL STRESSES
TRANSITION ELEMENTS
TUNGSTEN