Odhad kritického napětí pro porušení vrstevnatých kompozitních materiálů

Estimation of the critical stress for failure of layered composite materials

abstrakt

en

The contribution describes a study of the behaviour of a crack growing in a layered composite material and penetrating through an interface from one layer into a second one. Special attention is devoted to a crack touching the interface. Conditions for the stability of a crack terminating at the interface between two materials are analyzed. The problem is studied under the assumptions of linear-elastic fracture mechanics. A new tentative criterion of stability based on application of the strain energy density concept is formulated and applied to the problem. The criterion of stability formulated is based on application of the strain energy density concept as originally formulated by Sih for cracks in homogeneous materials.

Příspěvek zahrnuje studii chování trhliny rostoucí ve vrstevnatém kompositním materiálů a procházejícím přes rozhraní z jedné vrstvy do druhé. Speciální pozornost je věnována případu trhliny s vrcholem na rozhraní. Jsou analyzovány podmínky stability trhliny končící na rozhraní mezi dvěma elastickými materiály. Je použito kritérium založené na hodnotě faktoru hustoty deformační energie, původně odvozené Sihem.

The contribution describes a study of the behaviour of a crack growing in a layered composite material and penetrating through an interface from one layer into a second one. Special attention is devoted to a crack touching the interface. Conditions for the stability of a crack terminating at the interface between two materials are analyzed. The problem is studied under the assumptions of linear-elastic fracture mechanics. A new tentative criterion of stability based on application of the strain energy density concept is formulated and applied to the problem. The criterion of stability formulated is based on application of the strain energy density concept as originally formulated by Sih for cracks in homogeneous materials.

rozhraní, vrstevnaté materiály, stabilita trhliny, kritické napětí, keramické kompozity

interface, layered materials, crack stability, critical stress, ceramic composites

07.10.2008

Beijing Institute of Technology

Beijing, China

IWCMM18

103–103

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