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Lomové chování kompozitů s křehkou matricí vyztuženou vlákny
Chlup, Zdeněk ; Dlouhý, Ivo ; Boccaccini, A. R. ; Chawla, K. K.
A number of examples exist that indicate the potential for increasing the fracture resistance of brittle matrix by dispersing brittle fibres. For applications development the real composite constituents response during mechanical loading under presence of flaws appears to be important. Theoretical and experimental knowledge sampled on glass matrix composites reinforced by fibres is shortly summarised in the paper. Borosilicate glass with continuous Nicalon fibres and the same matrix containing the chopped carbon fibres as well as the ZrO2 particles (hybrid composite) have been in focus of interests. Chevron notch technique was mainly used for the fracture toughness evaluation. High fracture toughness level of both composites has been proved when testing the as received state. Damage introduced by thermal ageing and/or thermal cycling has been discussed based on fracture toughness values and fracture behaviour analyses
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Přenositelnost lomové houževnatosti z malých těles na tělesa standardních rozměrů
Dlouhý, Ivo ; Chlup, Zdeněk ; Kozák, Vladislav
The capability of pre-cracked Charpy type specimens for prediction of fracture toughness characteristics for standard (1T) bend specimens has been analysed. The toughness scaling model and the master curve methodology have been combined for these purposes. Cast low-carbon manganese steel cut from midthickness of thick plate was used as an experimental material being tested as a candidate material for container casks of spent nuclear fuel. The Dodds-Anderson toughness scaling model was applied for toughness data correction from small scale pre-cracked Charpy specimens. This approach was combined with master curve methodology for the fracture toughness - temperature diagram and loading rate effects predictions supplying good correlation of predicted data with real behaviour
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Lomové chování kompozitů s křehkou (skelnou) matricí
Dlouhý, Ivo ; Chlup, Zdeněk ; Boccaccini, A. R.
A number of examples exist that indicate the potential for increasing the toughness of brittle matrix by dispersing different reinforcements. For further development of these advanced materials the real material response during mechanical loading under presence of flaws appears to be important. Theoretical and experimental knowledge sampled on different kinds of brittle matrix composites is summarised in the paper. These include glass matrix with metallic particles, alumina platelets, continuous Nicalon fibres, both the chopped fibres and ZrO2 particles (hybrid composite). Almost all of these composites were tested in as received state but also after thermal exposition and/or thermal shocking applied according to supposed composite application. Chevron notch technique was mainly used for the fracture toughness evaluation. Damage will be explained on base of fracture micromechanism
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