On the Characterization of Fracture Loci in Thin-Walled Tube Forming

Magrinho, J.P.; Silva, M.B.; Martins, Paulo

doi:10.1007/978-3-030-75381-8_9

Cited by 5 publications

(3 citation statements)

References 19 publications

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Section: Resultsmentioning

confidence: 99%

“…The fracture strains at the onset of cracking cannot be directly obtained from these last measurements because inhomogeneous deformation makes their values extremely sensitive to the location of the selected measured points at the crack neighbourhood. 16 As a result of this, the authors decided to combine the information obtained from DIC with the measurements of the specimen thicknesses t f along the cracks to obtain the 'gauge length' strains. The methodology consisted in first obtaining the thickness strain at fracture e 3f by means of,…”

Section: Fracture Strainsmentioning

confidence: 99%

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Revisiting the ring hoop test in additively manufactured metal tubes

Pragana

Bragança

Martins

2021

The Journal of Strain Analysis for Engineering Design

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This paper is focussed on the mechanical and formability characterisation of wire-arc additive manufactured (WAAM) AISI 316-L stainless-steel tubes. The methodology to be presented involved carrying out tension and ring hoop tension tests on specimens extracted from the tube longitudinal, transverse and inclined directions. The force evolutions, acquired from the load cells, and the strain measurements, retrieved from digital image correlation and from thickness measurements along the cracks, allowed obtaining the stress-strain curves, the strain paths and the onset of failure by fracture for the three different tube directions. Special attention was paid to the ring hoop test, which was revisited to determine the appropriateness of using ring specimens with one or two dumbbell geometries. The originality of using the ring hoop tension test in WAAM tubes with strong anisotropic behaviour allowed obtaining strain loading paths that range from plane strain to pure shear deformation conditions. Resort to commercial AISI 316-L stainless-steel tubes during the presentation is included for reference purposes.

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Section: Resultsmentioning

confidence: 99%

Section: Fracture Strainsmentioning

confidence: 99%

Revisiting the ring hoop test in additively manufactured metal tubes

Pragana

Bragança

Martins

2021

The Journal of Strain Analysis for Engineering Design

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“…from uniaxial tension towards equi-biaxial strain with strain ratios (𝛽𝛽) between -1/2 and 1. Very recently, Magrinho et al [4] evaluated the mode II fracture loci, i.e. the shear FFL or SFFL for tubes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Conventional and Incremental Forming of Thin-Walled Tube

Suntaxi

Centeno

Rosa-Sainz

et al. 2022

KEM

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This study presents a numerical analysis of the tube expansion process by conventional tube-end forming versus single point incremental forming (SPIF) using DEFORM. The work includes the assessment of the strain paths within the principal strain space of these processes with respect to the formability limits as well as their evaluation within the equivalent strain versus stress triaxiality space. The results obtained demonstrated that the mechanics of tube flaring process in conventional and incremental forming are substantially different. This analysis of formability in the light of the accumulated equivalent strain and the average stress triaxiality allowed a better understanding of the differences between both processes in terms of the fracture limit strains.

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