Kinematic fields measurement during Ti-6Al-4V chip formation using new high-speed imaging system
Article dans une revue avec comité de lecture
Author
Date
2023-01Journal
The International Journal of Advanced Manufacturing TechnologyAbstract
Orthogonal cutting on Ti-6Al-4V produces segmented chips which results from localized deformation within the Primary Shear Zone (PSZ). For in situ visualization of the material flow during Ti-6Al-4V chip formation, a new high-speed optical system is proposed. Difficulties arise from the submillimetric size of the cutting zone. Therefore, a dedicated optical system with coaxial illumination is designed allowing for local scale analysis of chip formation. In this paper, the cutting forces were measured highlighting the unsteady nature of Ti-6Al-4V chip segmentation. For kinematic fields measurement, a novel method of Digital Image Correlation (DIC) technique is applied on the recorded images from the cutting zone. It allows for the identification of the localized deformation bands. Then, the level of the cumulative strain fields reached in the PSZ was presented and analyzed. The effect of the rake angle on the strain fields was studied. Using a 0∘ rake angle, the segment chip was found to be more subjected to deformation than in the case using 15∘. Accuracy of the measured strain fields was discussed function of the main source of errors. In addition, the chip morphology and microstructure were investigated with a scanning electron microscopy (SEM). It shows crack opening along the PSZ and high material failure near the tool-chip interface which explains the difficulties of DIC application in the context of kinematic fields measurement during orthogonal cutting. Finally, correlation between the measured strain fields and the mean value of the chip segment width was made.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Communication avec acteThe determination of all the 6 mechanical actions of cutting processes is very interesting for modeling of milling, turning and drilling in order to optimize the geometric parameters, kinematic, improve the quality of the ...
-
Communication avec acteLIU, Hongguang; CHERIF, Mehdi; CALAMAZ, Madalina; ELIAS-BIREMBAUX, Hélène L.; ROSSI, Frederic; POULACHON, Gerard; AYED, Yessine (Elsevier BV, 2023)This paper presents a novel 3D numerical model of drilling CFRP to evaluate the degradation of mechanical properties in the hole surfaces. It can be used to determine the change of functional performance induced by accumulated ...
-
Article dans une revue avec comité de lectureALONSO, Unai; CALAMAZ, Madalina; IRIONDO, Edurne; GIROT, Franck (Society of Manufacturing Engineers, 2019)Hybrid stacks made of carbon reinforced plastic (CFRP) and Ti-6Al-4 V alloy (Ti) are often drilled together to reduce positional errors, enhance tight tolerances and minimize machining time. However, this is a complex task ...
-
Article dans une revue avec comité de lectureThis paper aims to establish the wear mechanisms of coated and uncoated tungsten carbide drills when drilling carbon fibre reinforced plastics (CFRP)/aluminium alloy (Al) stacks. During the drilling experiments, thrust ...
-
Article dans une revue avec comité de lectureIn the present study, the titanium alloy ‘Ti–6Al–4V’ is orthogonally machined without cutting fluid. During experiments, the cemented carbide tools were rigidly mounted on the tool holder with rake angles of 0°, 15° and ...