An investigation of enhanced formability in AA5182-O Al during high-rate free-forming at room-temperature: Quantification of deformation history

Simulation of electrohydraulic free forming of DP600 sheets using a modified Rousselier damage model

“…Figure 2 shows uniaxial tension (UT), plane strain (PS) and biaxial tension (BT) specimen geometries used for numerical simulations. The pressure on the sheet specimens was modelled by as an exponentially decaying function of time proposed by Rohatgi et al [15]. The proposed Rousselier damage model and the modified JC hardening function were implemented in a user material subroutine (VUMAT) that was employed in three-dimensional dynamic explicit finite element simulation in ABAQUS.…”

“…Jenab et al [3,13] investigated the deformation and damage mechanisms in AA5182 and showed that ductile damage mechanisms were suppressed as a result of die impact during electrohydraulic die forming. Moreover, Rohatgi et al [14,15] used experimental and numerical methods to quantify the deformation behaviour of AA5182 and DP600 and analyse different strain paths a sheet material experienced when tested under EHFF and EHDF. On the other hand, Gillard et al [7] and Hassannejadasl et al [8] focused on the numerical simulation of EHF to predict loading mechanisms and deformation behaviour of sheet metal specimens using a combined Lagrangian-Eulerian finite element models in ABAQUS and LS-DYNA.…”

Investigation and numerical analysis of impulsive hydroforming of aluminum 6061-T6 tube

“…In order to verify accurate and valid results in high strain rate forming processes such as electrohydraulic forming, the structural model of material must be taken properly. Therefore Johnson-Cook (JC) structural model which considers those parameters (strain, strain rate, strain hardening and temperature) is applied to the analysis and its constants are derived from various and reliable papers [20][21][22] for Al6061-T6. Also the constants for Al5182-O are implemented from [23].…”

“…Also the constants for Al5182-O are implemented from [23]. The Table 1 Johnson-Cook structural model constants for Al6061-T6 [20][21][22] and for Al5182-O [23]. …”

“…First term in the above equation stands for work hardening response at the reference strain rate ( 0 = 1) and second and third terms relate to the effects of strain rate and temperature on the induced stress in the material, respectively [22]. Table 1 shows Johnson-Cook structural model constants for Al60601-T6 [20][21][22] and Al5182-O [23].…”