Modeling Response and Strength of MMC Under Compressive Loading.
Final rept. 1 Feb 93-31 Jan 95,
BATTELLE MEMORIAL INST COLUMBUS OH
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During this period, extensive research was conducted to study the inelastic deformation of MMCs under monotonic loading for both transverse and longitudinal laminae. Results showed that unidirectional MMC deformation response is strongly controlled by matrix plasticity. this is followed by local instability due to region.fiber buckling and failure of the lamina is due to fiber fracture in this local region. For transverse MMCs, plastic deformation in the matrix is associated with extensive fiber-matrix debonding followed by fiber radial fracture. During this period, research was conducted to develop strength models for MMCs based on failure mechanisms. Both longitudinal and transverse proportional limits onset of nonlinearity could be predicted based on properties of the constituents and information about the failure mode that contributes to nonlinear response. Investigation was also carried out to determine the nature of local damage in MMCs with holes under pure compression. These failure modes were studied carefully and it was shown that the Hinckey-Von Mises failure criteria could be effectively used to predict the location of the damage initiation site. Also, during this period, some preliminary experiments were conducted for reversed fatigue loading of lingitudinal MMC. this was accomplished with extra effort on the part of the principal investigator within the second year.
- Laminates and Composite Materials