Strain, strain rate and velocity fields determination at very high cutting speed

List, Gautier; Sutter, Guy; Bi, Xue Feng; Molinari, A.; Bouthiche, Abdenbi

doi:10.1016/j.jmatprotec.2012.11.021

Cited by 42 publications

(21 citation statements)

References 16 publications

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“…In a cutting operation, strain rates are important, their estimation by analytical and experimental methods is of the order of 10 3 s 1 -10 5 s 1 [18,19]. When the strain rate increases, the flow stress also increases leading to the generation of heat due to plastic deformation.…”

Section: Materials Constitutive and Damage Lawsmentioning

confidence: 99%

Experimental and numerical study of laser-assisted machining of Ti6Al4V titanium alloy

Ayed

Germain

Salem³

et al. 2014

Finite Elements in Analysis and Design

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Laser-assisted machining combines several experimental parameters such as cutting speed, feed rate, depth of cut, laser power and distance between tool rake face and the laser beam axis. The optimization of these parameters is necessary to ensure the efficiency of assistance and to increase productivity. This paper focuses on the understanding of the physical phenomena during laser-assisted machining, and on optimising this process. This contribution is based on an experimental and a numerical study. The experimentalpart highlights the effects of the laser power as well as the distance between the tool rake face and the axis of the laser beam. As for the numerical part, it was performed on the ABAQUS/Explicit software. The proposed model improves the understanding of the physical phenomena of chip formation and the cutting force reduction when machining with laser assistance. In addition, this model allows a better optimization of laser and cutting parameters.Numerical findings generally corroborate experimental results and can lead to some other information difficult to catch experimentally.The main contention in the paper is that the distance between the axis of the laser beam and the tool rake face is the most important parameter that controls the reduction of the cutting force. This cutting force reduction can exceed 50%.

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Section: Materials Constitutive and Damage Lawsmentioning

confidence: 99%

Experimental and numerical study of laser-assisted machining of Ti6Al4V titanium alloy

Ayed

Germain

Salem³

et al. 2014

Finite Elements in Analysis and Design

View full text Add to dashboard Cite

show abstract

“…In order to determine the strains inside the work material, different markings have been applied to the surfaces prepared for observation: paint [20], grids [11,21,22], lines [14], or directly via microstructural observation after etching [12,13,15]. The laser-induced fluorescence (LIF) technique is currently being employed for PIV in the field of fluid mechanics [23].…”

Section: Introductionmentioning

confidence: 99%

Kinematic Field Measurements During Orthogonal Cutting Tests via DIC with Double-frame Camera and Pulsed Laser Lighting

et al. 2017

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The measurement of machined-part strain fields induced by the cutting process remains a challenge because of the presence of highly intensive and localised strains. In this study, a high-speed double-frame imaging device with pulsed laser lighting is used in order to obtain sharp and highly resolved images during orthogonal cutting tests performed in an aluminium alloy. The displacement fields are then measured using a global Q4-digital-image-correlation (DIC) method and several strategies, facilitating calculation of the total displacements due to the cut, along with the residual strains in the machined part. Numerical procedures are developed to manage the removed material that disturbs the DIC. An automatic primary shear angle detection procedure using DIC is also proposed. Five different markings, which are produced via chemical etching and micro blasting, are applied to the observed surfaces. Their effects on the kinematic fields and the uncertainties are then studied. Three surface parameters are proposed as indicators for determining the surface preparation suitability for the DIC. The repeatability of the kinematic fields induced during the cutting process is studied, because of the ease with which testing can be performed. Finally, the plastically deformed layer engendered by the cutting process is measured using the calculated residual strains.

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“…Nevertheless, at such cutting speed, the capture apparatus is only able to render 1.5 images per segment and thus only provides a glance at a more complex process. More recently, [29] proposed a method to replace the grids using flow line shape analysis. Four lines were drawn parallel to the cutting direction on the side of the workpiece using a mechanical scratching method.…”

Section: Introductionmentioning

confidence: 99%

Sub-Millimeter Measurement of Finite Strains at Cutting Tool Tip Vicinity

et al. 2014

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The present paper details a simple and effective experimental procedure dedicated to strain measurement during orthogonal cutting operations. It relies on the use of high frame-rate camera and optical microscopy. A numerical post-procedure is also proposed in order to allow particle tracking from Digital Image Correlation (DIC). Therefore strain accumulation within finite strains framework is achieved. The significant magnitude of the calculated strains is partially due to a singular side effect that leads to local material disjunction. The strain localization in the Adiabatic Shear Band (ASB) exhibits different strain paths at various locations along this band and a non-linear evolution of the strain accumulation. A focus is made on the formation mechanisms of serrated chips obtained from Ti6Al4V titanium alloy. The side observation performed during this work allow to proposed three possible scenarios to explain this very phenomenon.

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Strain, strain rate and velocity fields determination at very high cutting speed

Cited by 42 publications

References 16 publications

Experimental and numerical study of laser-assisted machining of Ti6Al4V titanium alloy

Experimental and numerical study of laser-assisted machining of Ti6Al4V titanium alloy

Kinematic Field Measurements During Orthogonal Cutting Tests via DIC with Double-frame Camera and Pulsed Laser Lighting

Sub-Millimeter Measurement of Finite Strains at Cutting Tool Tip Vicinity

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