Characterization of slip lines in single edge notched tension specimens

Gerven, Filip Van; Waele, Wim De; Rosado, Diego Belato

doi:10.21825/scad.v6i3.1128

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…Notably, this simplification influences the outcome given the finite and non-linear nature of occurring deformations; strain bands would have a slightly different shape when considered within a moving grid. 33 Output has been analyzed at different moments during the test, allowing to characterize the evolution of strain concentration as a function of applied crack driving force (CTOD).…”

Section: Evaluation Of Defect Interaction Based On Strain Concentratimentioning

confidence: 99%

A strain-based approach to study interaction between non-coplanar through-thickness edge notches

Samadian

Hertelé

2018

The Journal of Strain Analysis for Engineering Design

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Structural integrity assessment procedures to assess the effect of interaction between multiple adjacent flaws normally consist of two stages. First, alignment rules categorize non-coplanar flaws as aligned or non-aligned. Second, combination rules classify aligned flaws as interacting or non-interacting. Although these criteria are applied to different failure modes like brittle fracture, elastic-plastic fracture and plastic collapse, most of them were developed based on linear elastic fracture mechanics for the sake of simplicity. However, there are very limited references available for the technical background of these criteria. This lack of justifying backgrounds becomes more critical when applying these procedures to any other failure modes other than brittle fracture. This article studies the interaction between non-coplanar edge notches in scenarios of large deformation. Hereto, strain patterns are studied through full-field deformation measurements utilizing both experimental and numerical tools. Digital image correlation is used to measure strain during experiments and to verify the finite element analyses. The results show that in addition to the crack driving force, which represents a local response of notches, the global strain distribution within the specimen in terms of strain patterns can be used to probe the interaction between non-coplanar flaws. The authors suggest a novel criterion based on the trajectory of maximum equivalent strain to distinguish between aligned and non-aligned flaws. This study is based on doubleedge notched tension specimens and gives a fundamental insight into flaw interaction in failure modes other than brittle fracture.

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Section: Evaluation Of Defect Interaction Based On Strain Concentratimentioning

confidence: 99%

A strain-based approach to study interaction between non-coplanar through-thickness edge notches

Samadian

Hertelé

2018

The Journal of Strain Analysis for Engineering Design

Self Cite

View full text Add to dashboard Cite

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Hydride induced embrittlement and fracture of non-hardening metals under hydrogen chemical equilibrium

Varias

2024

International Journal of Solids and Structures

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Experimental and numerical slip line analysis of welded single-edge notched tension specimens

Hertelé

Gerven

Naib

et al. 2016

Procedia Structural Integrity

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Flaw assessments assume homogeneous material properties, but welds are heterogeneous. A procedure to account for heterogeneity effects on crack driving force (developed at Ghent University and Limerick University) requires strength properties along slip lines originating from the defect tip. For uniaxial tension loading, these lines are assumed straight and oriented 45° to the axis of loading. The presented paper investigates the soundness of this assumption. Clamped single-edge notched tension tests and simulations have been performed on base metal and welded specimens. Extensive deformation analyses reveal the evolution of slip line trajectories as the specimen deforms. Observed slip lines in base metal specimens are initially close to the assumed 45° trajectories, but deviate towards the notch section as deformation is increased. The change in angle is roughly linear as a function of crack tip opening displacement. Deformation analyses of the welded specimens reveal that hard regions can serve as barriers, causing slip lines to deviate from linearity and split into different branches. The implications of these observations on the flaw assessment of heterogeneous welds are investigated in ongoing work

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Characterization of slip lines in single edge notched tension specimens

Cited by 3 publications

References 6 publications

A strain-based approach to study interaction between non-coplanar through-thickness edge notches

A strain-based approach to study interaction between non-coplanar through-thickness edge notches

Hydride induced embrittlement and fracture of non-hardening metals under hydrogen chemical equilibrium

Experimental and numerical slip line analysis of welded single-edge notched tension specimens

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