By J. W. Dougill (auth.), A. M. Brandt, I. H. Marshall (eds.)
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4. DEVELOPMENT OF INTERNAL STRESSES In the formation of a composite high stresses originate at the interface as a consequence of the shrinkage of the matrix in the course of solidification and possible considerable difference in the coefficients of thermal expansion in the course of cooling from the solidification temperature, At the boundaries of the particles, most frequently in the enveloping (modified) layer, but also in the particles themselves, microfailures (microcracks) frequently originate (Fig.
10. A practical example of such a system is the PIC or the C/C/SiC ceramics. If we create, for example, in accordance with Fig. II, two systems with the same matrix volume in unit volume, once a non-porous PC and the other time a PIPC system by impregnation of the continuously porous PC, we shall introduce into the system in the latter case, apart from two mutually interspersed bearing structures, an additional number of interfaces. The new deformation and failure mechanisms of two mutually independent, chemically identical, but physically, morphologically and crystallographically different infrastructures are capable of absorbing a great quantity of energy.
X EQJ "- dried Io o G III . V >-c '0 C F E ~ H Fig. 1. only of the second solid phase and the fluid phase. We see that we find not an accidental, but a regularly variable change of all the physical characteristics. The first obvious similarity of the dependence of all these relationships on the volume representation of the individual phases (regardless of their type and geometrical form) lies in the fact that their changes are markedly different in three regions and that these regions are identical for all the observed characteristics.
Brittle Matrix Composites 1 by J. W. Dougill (auth.), A. M. Brandt, I. H. Marshall (eds.)