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By S. T. Mileiko

The most goal of this publication is to aid engineers and others comprehend what sort of constitution presents the mandatory houses, and the way to acquire the proper composite constitution.

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M 1/2 and values 10 to 20 M P a - m 1/2 for PSZ and tetragonal zirconia polycrystals [44, 91]. However, the toughening effect disappears at the temperature at which tetragonal phase becomes stable and this is a main drawback of the transformation toughening mechanism. 1), the crack can be pinned by larger particles of the second phase in the ceramic matrix [353] provided the particles are sufficiently strong and they are strongly bonded to the matrix. Microcracking If the second phase particles are bonded to the matrix weakly they can debond under stressing.

Any general requirement to an 300 ' 'o' 200 :\' o . . o ' . . . . . : . 0 \ 0 0 0 100 0 0 500 l ! t I J I000 I I i ! I I 1500 c~. I / ! 0 0 I I 2000 MPa I I _ ' J 2500 Fig. 14. Fracture toughness versus strength for steels. After compilation given in [336]. Ch. 3 160 29 Structural materials I , , , , I , , , r I , , , ' oo ~ 120 "o'~~o ~o o o o o o o c~ o o@o ~ 8o o \ 4o 0 75o o o ! t i o I I I I I l I000 o o o ] o i 1250 o. / I i _ I 1500 MPa Fig. 15. Fracture toughness versus strength for titanium alloys.

To conclude, we have to point out one more advantage of a wider usage of nonmetallic substances. John Bernal was the first to emphasize that when we are using nitrides, carbides, etc. we are consuming chemical elements which are not so rare on Earth as metals used for structural alloys. Actually, changes in environmental problems which would arise as a result of a wide use of composites based on ceramics, have not been discussed yet. The time for such a discussion is still remaining. This Page Intentionally Left Blank Chapter II FIBRES AND FIBROUS COMPOSITES Before going into the discussion of mechanical behaviour of fibrous composites which shall be done in Part II, we give here a short description of the materials to be considered in detail further on.

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