Elastic-plastic finite element analyses of an unidirectional, 9 vol percent tungsten fiber reinforced copper matrix composite

Technical Report · Wed Sep 01 00:00:00 EDT 1993

OSTI ID:5438018

Sanfeliz, J G

Micromechanical modeling via elastic-plastic finite element analyses were performed to investigate the effects that the residual stresses and the degree of matrix work hardening (i.e., cold-worked, annealed) have upon the behavior of a 9 vol percent, unidirectional W/Cu composite, undergoing tensile loading. The inclusion of the residual stress-containing state as well as the simulated matrix material conditions proved to be significant since the Cu matrix material exhibited plastic deformation, which affected the subsequent tensile response of the composite system. The stresses generated during cooldown to room temperature from the manufacturing temperature were more of a factor on the annealed-matrix composite, since they induced the softened matrix to plastically flow. This event limited the total load-carrying capacity of this matrix-dominated, ductile-ductile type material system. Plastic deformation of the hardened-matrix composite during the thermal cooldown stage was not considerable, therefore, the composite was able to sustain a higher stress before showing any appreciable matrix plasticity. The predicted room temperature, stress-strain response, and deformation stages under both material conditions represented upper and lower bounds characteristic of the composite's tensile behavior. The initial deformation stage for the hardened material condition showed negligible matrix plastic deformation while for the annealed state, its initial deformation stage showed extensive matrix plasticity. Both material conditions exhibited a final deformation stage where the fiber and matrix were straining plastically. The predicted stress-strain results were compared to the experimental, room temperature, tensile stress-strain curve generated from this particular composite system.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 5438018
• Report Number(s): N-94-14719; NASA-TM-106304; E-8045; NAS-1.15:106304; CNN: RTOP 510-01-50
• Resource Relation: Other Information: Original contains color illustrations
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MATRIX MATERIALS
TENSILE PROPERTIES
REINFORCED MATERIALS
COPPER BASE ALLOYS
FIBERS
FINITE ELEMENT METHOD
PLASTICITY
TUNGSTEN
ALLOYS
CALCULATION METHODS
COPPER ALLOYS
ELEMENTS
MATERIALS
MECHANICAL PROPERTIES
METALS
NUMERICAL SOLUTION
TRANSITION ELEMENTS
360603* - Materials- Properties