Orthogonal micro-cutting modeling of the Ti17 titanium alloy using the crystal plasticity theory

Ayed, Yessine; Robert, Camille; Germain, Guénaël; Ammar, Amine

doi:10.1016/j.finel.2017.08.002

Cited by 21 publications

(4 citation statements)

References 54 publications

(67 reference statements)

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“…The machined surface in Figure 8g had more obvious plowing, bulging, and sticky chip, which adversely affected the quality of the machined surface. The sticky chips on the machined surface in Figure 8h appeared in a larger area due to the increased friction, extrusion between tool-chip and tool-workpiece, and increased heat generated by cutting [14], which intensified chip adhesion. The sticky chip on the machined surface reduced at 1800 mm/min (Figure 8i).…”

Section: Surface Morphology At Different Cutting Speedsmentioning

confidence: 99%

“…Zhao M et al [13] prefabricated four AA7075 aluminum alloys, investigated the influence of crystal orientation on the grinding force, and established a micro-grinding force prediction model. Ayed Y et al [14] performed a cutting simulation on Ti17 and investigated the effect of crystal orientation on chip formation and cutting force evolution. In addition, the cutting process was a complex thermal-force coupling process, accompanied by a high strain rate of plastic deformation and tool wear.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of the High-Speed Machinability of 7050 Aluminum Alloy Based on Different Prefabricated Crystal Orientations

Ni,

Lu,

Wang

et al. 2023

Lubricants

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This study investigated the high-speed cutting performance of 7050 aluminum alloy with prefabricated crystal orientations under dry-cutting conditions. Three specimens with different crystal orientations were prefabricated using pre-deformations of 10, 15, and 20%, and the effects of cutting parameters on cutting force, surface morphology, and tool wear were analyzed. The results showed that the three-dimensional cutting force initially increased and then decreased with the increase in cutting speed. In addition, the three-dimensional cutting force increased with the increase in cutting depth and feed rate. Under the same cutting parameters, the three-dimensional cutting force of 7050 aluminum alloy was in the following order: 20% pre-deformation > 10% pre-deformation > 15% pre-deformation. During high-speed cutting, different degrees of plowing, bulging, and sticky chips appeared on the machined surface, and the surface morphology of the 15% pre-deformed 7050 aluminum alloy was better than that of the other two pre-deformed 7050 aluminum alloys. During the high-speed cutting process, tool wear mainly occurred in the forms of collapse edge, adhesion, flaking, and breakage, and wear mechanisms were usually adhesive, diffusion, and oxidation wears. Under the same cutting parameters, the tool wear of the 15% pre-deformed 7050 aluminum alloy was lighter.

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Section: Surface Morphology At Different Cutting Speedsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation of the High-Speed Machinability of 7050 Aluminum Alloy Based on Different Prefabricated Crystal Orientations

Ni,

Lu,

Wang

et al. 2023

Lubricants

View full text Add to dashboard Cite

show abstract

“…A crystal plasticity based model was applied to describe the individual behavior of the HCP α and the BCC β phases. Ayed et al [3] extended the above approach by suggesting a 3D modelling of the grains by Voronoi cells. According to the authors, a notable change in the β-grains orientations was observed during cutting process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of cutting forces and chip formation during precision cutting of Ti42Nb titanium alloy produced by laser-based powder bed fusion

Boubaker

Le-Coz

Moufki

et al. 2023

Int J Adv Manuf Technol

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Ti-Nb alloys are high-profile candidates for the biomedical applications. However, because of poor surface integrity (i.e. residual stress and surface roughness), Ti-Nb implantable medical devices need to be machined in order to obtain functional surfaces finish. In this work, experimental and numerical investigations are conducted to study the micro-cutting response of Ti42Nb titanium alloy produced by laser-based powder bed fusion. Experimental micro-cutting tests are carried out using precision turning lathe. Trials are performed with two cutting velocities of 60 m/min and 120 m/min and different feed rates, varying from 5 to 40 µm/rev. For the numerical study, a porous crystal plasticity-based model is proposed to address the impact of anisotropy and microstructure heterogeneities of the polycrystalline material. The crystal plasticity-based model is identified using strain-stress curves obtained from compression tests performed under two strain rates and a wide range of temperatures. Numerical micro-cutting simulations are performed in order to gain insight into the impact of microstructural features (i.e. crystallographic orientation and grain size) on the machinability of the alloy. According to the results, the effect of the strain rates and the temperature on the thermomechanical behavior of the Ti42Nb titanium alloy produced by laser-based powder bed fusion is correctly depicted. The model captured the strain localization on adiabatic shear band during compression tests. According to the micro-cutting simulations, the local variables such as temperature, damage and plastic deformation are strongly impacted by the crystallographic orientations and the grain size. In addition, depending on the crystallographic orientations, the chip morphology changes form continues, slightly segmented to largely segmented.

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“…Many numerical models have been developed to study fracture for polycrystalline materials ( [4], [5], [6]). Recently, the phase field model has proven to be a powerful tool to simulate complex cracking phenomena ( [7], [8]).…”

Section: Introductionmentioning

confidence: 99%

Unified phase field model to simulate both intergranular and transgranular failure in polycrystalline aggregates

Riad

Bardel²,

Réthoré

2021

Finite Elements in Analysis and Design

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In this work we develop a new phase field method for modeling fracture in polycrystalline materials. Many studies addressed this problem by combining cohesive models at the grain boundaries and damage models for the bulk. In this paper, a unified formulation is proposed in the phase field framework. Anisotropic failure is considered within the grain. Each of the preferential failure direction is associated with a damage variable. An additional damage variable is dedicated to the grain boundaries which are considered of finite thickness. Furthermore the value of the fracture energy at the grain boundaries is set depending on the local misorientation. The obtained model allows modeling competition and interactions between intergranular and transgranular fracture. The proposed model is illustrated through several numerical examples including crack initiation and propagation in polycrystalline aggregates.

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Orthogonal micro-cutting modeling of the Ti17 titanium alloy using the crystal plasticity theory

Cited by 21 publications

References 54 publications

An Investigation of the High-Speed Machinability of 7050 Aluminum Alloy Based on Different Prefabricated Crystal Orientations

An Investigation of the High-Speed Machinability of 7050 Aluminum Alloy Based on Different Prefabricated Crystal Orientations

Experimental and numerical investigations of cutting forces and chip formation during precision cutting of Ti42Nb titanium alloy produced by laser-based powder bed fusion

Unified phase field model to simulate both intergranular and transgranular failure in polycrystalline aggregates

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