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2016 | OriginalPaper | Buchkapitel

Transition from Flat to Slant Fracture in Ductile Materials

verfasst von : William F. Hickey, Krishnaswamy Ravi-Chandar

Erschienen in: Recent Trends in Fracture and Damage Mechanics

Verlag: Springer International Publishing

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Abstract

We investigate ductile fracture in an aluminum alloy which exhibits an interesting switch in mode from flat fracture to slant fracture. While this transition is typically considered to be triggered by a change in crack tip constraint with specimen thickness, we explore this transition in rolled sheet material simply by controlling the strain hardening behavior of the material. Specifically, experiments are performed on two different heat-treatments of the same alloy, resulting in two materials that differ only in their strain-hardening behavior. Based on an examination of the microscopic and macroscopic strain evolution, we conclude that the transition arises because of strain localization that precedes fracture.

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Fußnoten
1
DIC breaks down very close to the crack tip, partly due to degradation of the paint and partly from image distortion that occurs due to large curvatures near the crack tip; nevertheless, it is possible to measure strains as close as 160 μm near the crack tip.
 
2
Here theta refers to crack tip polar coordinates, and θ = 0 is the line of symmetry.
 
3
The angle ϕ is defined relative to the crack front along the thickness direction.
 
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Metadaten
Titel
Transition from Flat to Slant Fracture in Ductile Materials
verfasst von
William F. Hickey
Krishnaswamy Ravi-Chandar
Copyright-Jahr
2016
DOI
https://doi.org/10.1007/978-3-319-21467-2_9

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