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• W2085440237 abstract "The potential of crack deflection and crack bridging as competing toughening mechanisms is reviewed. Available measurement techniques take a crucial role where it is required to distinguish between toughening increments associated with crack tip processes and crack wake processes near the crack tip. Particular emphasis is placed on measurements of the crack opening displacement. It is concluded that crack deflection has only small potential as a toughening mechanism compared to crack bridging, but is required to activate crack closure stresses associated with bridging ligaments. This simple realization defines a window of microstructural parameters in which crack deflection is active and where crack bridging parameters can be optimized. Rißablenkung und Rißüberbrückung werden als konkurrierende bruchzähigkeitserhöhende Mechanismen untersucht. Eine Schlüsselrolle nehmen dabei die derzeit verfügbaren Meßmethoden ein. Diese dienen vor allem zur Ermittlung von Bruchzähigkeits-steigerungen, die auf Prozesse an der Rißspitze und den Rißflanken nahe der Rißspitze zurückgeführt werden können. Besonders wichtig sind dabei Messungen der Rißöffnung. Die Ergebnisse zeigen, daß Rißablenkung im Vergleich zur Rißüberbrückung nur ein kleines Potential zur Erhöhung der Bruchzähigkeit besitzt—aber entscheidend für die Bildung von Schließspannungen ist. Die Gefügeparameter müssen deshalb so eingestellt werden, daß Rißablenkung möglich ist. Dann kann der Effekt der Rißüberbrückung optimiert werden. Cet article examine le potentiel respectif de la déviation et du pontage des fissures en tant que mécanisms concurrents permettant d'augmenter la ténacité. Les techniques de mesures disponibles jouent un rôle crucial pour différencier l'augmentation de la ténacité associée à la propagation de la fissure proprement dite des mécanismes survenant dans le sillage de celle-ci. Nous concluons que la déviation de fissure joue un rôle mineur par rapport au pontage des fissures, mais cela demande d'induire des contraintes visant à refermer la fissure grâce aux éléments de pontage. Cette simple étude permet la définition d'une gamme de paramètres microstructuraux pour laquelle la déviation des fissures joue un rôle actif et où le pontage de ces dernières peut être optimisé." @default.
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• W2085440237 date "1992-01-01" @default.
• W2085440237 modified "2023-10-07" @default.
• W2085440237 title "Interaction between crack deflection and crack bridging" @default.
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• W2085440237 doi "https://doi.org/10.1016/0955-2219(92)90027-b" @default.
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