Inelastic deformation of metal matrix-composites. Part 1: Plasticity and damage mechanisms. Final Report

Technical Report · Sun Mar 01 04:00:00 EST 1992

OSTI ID:7070714

Majumdar, B S; Newaz, G M

The deformation mechanisms of a Ti 15-3/SCS6 (SiC fiber) metal matrix composite (MMC) were investigated using a combination of mechanical measurements and microstructural analysis. The objectives were to evaluate the contributions of plasticity and damage to the overall inelastic response, and to confirm the mechanisms by rigorous microstructural evaluations. The results of room temperature experiments performed on 0 degree and 90 degree systems primarily are reported in this report. Results of experiments performed on other laminate systems and at high temperatures will be provided in a forthcoming report. Inelastic deformation of the 0 degree MMC (fibers parallel to load direction) was dominated by the plasticity of the matrix. In contrast, inelastic deformations of the 90 degree composite (fibers perpendicular to loading direction) occurred by both damage and plasticity. The predictions of a continuum elastic plastic model were compared with experimental data. The model was adequate for predicting the 0 degree response; however, it was inadequate for predicting the 90 degree response largely because it neglected damage. The importance of validating constitutive models using a combination of mechanical measurements and microstructural analysis is pointed out. The deformation mechanisms, and the likely sequence of events associated with the inelastic deformation of MMCs, are indicated in this paper.

• Research Organization: Battelle, Columbus, OH (United States)
• OSTI ID: 7070714
• Report Number(s): N-92-22284; NASA-CR--189095; NAS--1.26:189095; CNN: NAS3-26053
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
AMBIENT TEMPERATURE
CARBIDES
CARBON COMPOUNDS
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CRACK PROPAGATION
CRYSTAL STRUCTURE
DAMAGE
DEFORMATION
EVALUATION
FIBERS
MATERIALS
MATERIALS TESTING
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PLASTICITY
POISSON RATIO
SILICON CARBIDES
SILICON COMPOUNDS
TESTING
TITANIUM ALLOYS
TITANIUM BASE ALLOYS