Estimativas Numéricas Do Trabalho Plástico Até a Iniciação Da Fratura Por Rasgamento

Marques, Luiz Fernando Nazaré; Cota, Eduardo Enes; Castro, Jaime Tupiassú Pinho de; Martha, Luiz Fernando; Meggiolaro, Marco Antônio

doi:10.5151/1516-392x-31637

Cited by 1 publication

(2 citation statements)

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“…Similar results were obtained on 2024 aluminum alloy, 27 on Q370qE steel, 28 and on API 5L X80 high strength pipeline steel. 29 The transition in the plastic zone between the surface and the bulk was found to depend on parameters such as the specimen thickness and the maximum load. 30 The previous techniques cannot provide direct experimental data on the behaviour within the bulk of the material.…”

Section: Introductionmentioning

confidence: 98%

“…Given the very high computational cost of 3D FEM simulations, accurate tridimensional results on fatigue cracks have only be developed in the last 10 years or so. 26,27,29,30 Thorough validation of 3D FEM results is still lacking since most 3D simulations have either not been experimentally validated [44][45][46][47][48][49] or the validation has been based on limited surface information. 22,[26][27][28]50 On the other hand, synchrotron X-ray radiation has been used to infer some crack properties in the bulk 35,37,38,51,52 but no direct measurement of the crack tip plastic zone has yet been achieved.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of the crack tip plastic zone in fatigue via synchrotron X‐ray diffraction

Carrera

Cruces

Kelleher

et al. 2022

Fatigue Fract Eng Mat Struct

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This paper describes a new methodology for characterising the plastic zone ahead of a fatigue crack. This methodology is applied to a set of experimental data obtained by synchrotron X-ray diffraction on a bainitic steel compact tension specimen. The methodology is based on generating the equivalent Von Mises strain field from the X-ray experimental elastic strain maps. Based on the material response, a threshold is then applied on the equivalent strain maps to identify the size and shape of the plastic zone. The experimental plastic zone lies between the plane strain and plane stress Westergaard's bounds but closer to the plane strain theoretical prediction confirming that the volume analyzed is predominantly subjected to plane strain conditions. However, the observed plastic zone has a somewhat flatter shape, extending further from the crack plane but less extended in the crack growing direction.

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