Determination of Material Constitutive Laws for Inconel 718 Superalloy Under Different Strain Rates and Working Temperatures

Lui

et al. 2021

JMMP

The present study proposes an integrated prediction model for both shearing and ploughing constants for the peripheral milling of Inconel 718 by using a preidentified mean normal friction coefficient. An equation is presented for the identification of normal mean friction angle of oblique cutting in milling. A simplified oblique cutting model is adopted for obtaining the shear strain and shearing constants for a tool of given helix angle, radial rake angle, and honed edge radius. The shearing and ploughing constants predicted from analytical model using the Merchant’s shear angle formula and the shear flow stress from the selected Johnson–Cook material law are shown to be consistent with the experimental results. The experimentally identified normal friction angles and shearing and edge ploughing constants for the Inconel 718 milling process are demonstrated to have approximately constant values irrespective of the average chip thickness. Moreover, the predicted forces obtained in milling aged Inconel 718 alloy are in good agreement with the experimental force measurements reported in the literature. Without considering the thermal–mechanical coupling effect in the material law, the presented model is demonstrated to work well for milling of both annealed and aged Inconel 718.

Section: Comparison Of Predicted and Identified Cutting Constantsmentioning

confidence: 99%

Prediction of Shearing and Ploughing Constants in Milling of Inconel 718

Lui

et al. 2021

JMMP

Eksploatacja i Niezawodność – Maintenance and Reliability

“…The methodology of the determination of thermal conductivity and diffusivity using the LF method is described in Ref. [6]. In contrast, the diffusivity of pure aluminium decreases but its values are ten times higher than for a titanium alloy.…”

Section: Measurement and Visualization Techniquesmentioning

confidence: 99%

Investigation of the tribological performance of AlTiN coated cutting tools in the machining of Ti6Al4V titanium alloy in terms of demanded tool life

Grzesik¹,

Niesłony²,

Habrat³

2019

Proceedings of the Institution of Mechanical Engineers, Part E:

“…16 Also, the model takes account of different extents of thermomechanical settings stipulated by the metal removal process, besides the model is adequately capable of continuous chip modeling and continues to be recognized in the literature. 17,18 Grzesik et al 19 chose JC constitutive model to examine the cutting forces and temperatures through the machining of Inconel 718 alloy. The authors revealed a high degree of similarity between the predicted and the experimental values.…”

Section: Introductionmentioning

confidence: 99%

Investigations on machining characteristics and chip morphology in turning Al-Mn (AM) alloy using finite element simulation

Dutta

Narala

2021

Finite element analysis has become an indispensable tool, often used in research and development, to provide valuable insights into the process. The studies in the metal cutting area mostly employ the Finite element method (FEM) due to its ability to highlight the physics involved in chip formation and the range of force generated in the cutting zone. The study involves investigations by adopting the Johnson-Cook (JC) constitutive model with energy-based damage criteria to simulate the turning of a fabricated AM (Mg alloy: 7 wt%Al-0.9 wt%Mn) alloy. For the FEM, the JC and Damage model constants are calculated using inverse identification methodology. The results obtained on the cutting force (Fc), cutting temperature (Tc), and chip-thickness (tc) at different combinations of turning parameters were analyzed and compared with the experimental values. The Predicted data was in line with the experimental data, and a variation of mostly less than 12% was observed. Thus, establishing the efficacy of inverse identification method. Further, the obtained results exhibit the significant influence of turning parameters on Fc(N), Tc(°C), and tc(mm) and enunciates crucial facts related to the AM alloy's machinability.