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Non-frictional jamming of inclusions - an ignored toughening effect

: Weiß, H.-J.


Journal of the European Ceramic Society 10 (1992), Nr.3, S.161-165 : Abb.,Lit.
ISSN: 0955-2219
Fraunhofer IWS ()
Bruchzähigkeit; ceramic; composite material; crack bridging; Einlagerung; fracture toughness; inclusion; Keramik; reinforcement; Rißüberbrückung; Verbundwerkstoff; Verstärkung

The load carried by inclined platelets bridging a crack is approximately calculated in the absence of bonding and friction in order to separate the effect of non-frictional jamming from that of frictional load transfer. This is done by means of a simple model where the strain field is essentially reduced to uniaxial compression of certain matrix regions. The work of opening the crack against the jamming force provides a contribution to the fracture toughness of the composite. The estimate shows that this contribution may be of practical interest for ceramics.