Formability improvement in Ti–6Al–4 V sheet at room temperature by pulsating hydraulic bulging: experimental and numerical investigations

Ti–6Al–4 V sheets possess limited formability at room temperature due to low ductility with almost no strain hardening. Pressure pulsation during hydroforming may bring significant improvement as an alternative to the widespread solution hot forming. However, much uncertainty exists on the deformati...

Full description

Saved in:
Bibliographic Details
Published in:International journal of advanced manufacturing technology 2023-02, Vol.124 (7-8), p.2903-2918
Main Authors: Öztürk, Osman, Korkmaz, Habip G., Ataş, Gürkan, Aydin, Mevlüt, Türköz, Mevlüt, Toros, Serkan, Dilmeç, Murat, Livatyali, Haydar, Kotan, Hasan, Halkaci, H. Selçuk
Format: Article
Language:English
Subjects:
Bulging
CAE) and Design
Computer-Aided Engineering (CAD
Deformation effects
Deformation mechanisms
Elongation
Engineering
Finite element method
Formability
Fracture surfaces
Hot forming
Hydroforming
Industrial and Production Engineering
Mechanical Engineering
Media Management
Original Article
Pressure effects
Pulsation
Room temperature
Strain hardening
Stress relaxation
Surface analysis (chemical)
Thickness
Titanium
Vanadium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ti–6Al–4 V sheets possess limited formability at room temperature due to low ductility with almost no strain hardening. Pressure pulsation during hydroforming may bring significant improvement as an alternative to the widespread solution hot forming. However, much uncertainty exists on the deformation mechanism and effects of pulsating on difficult-to-form materials. In this study, the effect of pulsating pressure on the hydraulic bulge test was investigated to increase the limited formability of the Ti–6Al–4 V sheet at room temperature. Experimental results of thickness distribution and bulge height obtained from the bulge tests were compared with the finite element simulation results. The results show that the tests with pulsation allow a higher thickness reduction with a slightly more homogenous thickness distribution. Pulsation causes a delay in the material’s failure resulting in a 15.4% increase in the dome height with a 17% increased burst pressure compared to monotonic loading. The underlying microstructural phenomena of increased formability were elaborated using dislocation estimations, fracture surface analysis, and hardness. Test results suggest that pulsation improves formability by 47% in terms of maximum elongation due to stress relaxation.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-022-10693-3