The non-isothermal hot deep drawing of AA5083 aluminum alloy

Abstract

The present work is focused on the hot deep drawing process for cylindrical 5083 aluminum alloy parts, by superimposing a thermal gradient between the blank center-flange region. The imprtance of application of forming processes at elevated temperatures, in improving the formability, has increasingly attracted attention in recent years. As a case study, the experimental and numerical tests were performed at three speeds (60, 200 and 378 mm min−1) from room temperature (RT) up to 0.9 melting point, inspired by the advent of extraordinary superplastic behavior of AA5083 in hot condition. In particular, the focus was on the effects of forming speed on punch load, thickness distribution, and earing behavior. Finite element simulations were run in order to investigate the limiting drawing ratio and temperature gradient. The tests highlight that by increasing the temperature, the number and the position of the ears are constant, while the height of ears decreases. Furthermore, limiting drawing ratio equal to 2.84 is reached at 550 °C.

Electrically-assisted mechanical clinching of AA6061-T6 aluminum to galvanized DP590 steel: effect of geometrical features on material flow and mechanical strength

“…The uniaxial tensile tests were performed according to ASTM E08 standard, using a universal testing machine model STM-50 equipped with a load cell at a constant speed of 1 mm/s. An elastic-plastic behavior was described using the stress-strain data up to maximum uniform strain to fit the Hollomon constitutive equation (2).…”

“…where s Y is the yield stress of the material with the lower mechanical strength. As depicted in Figure 8, Coulomb friction tests were performed at each condition to find the right Coulomb coefficients for the tool-sheet interface to insert in the FE model [2]. The friction coefficients (m) for the tool-sheet interface reported in Table 4, were calculated using Coulomb friction law.…”

“…However, aluminum alloys are not completely replaceable with steels due to challenges such as cost, performance, and joining problems. Therefore, the hybrid use of aluminum alloys and high strength steel alloys has become an inevitable trend for fabricating lightweight assemblies made in aluminum to steel (Al/St) [1,2].…”

Enhancement of the tensile shear strength for joining low-ductility aluminium to high-strength steel by using electrically-assisted mechanical clinching (EAMC)

“…Coulomb friction tests were performed at each condition to find the right friction coefficients as was recently explained with details by Barimani-Varandi. 1 The extracted friction coefficients (m) for the tool contact are presented in Table 4. The friction coefficients for the sheet-sheet interface were calculated 0.50 and 0.55, respectively for the MC and EAMC.…”

“…The hybrid use of aluminium to steel (Al/St) sheets has become an inevitable trend for fabricating lightweight assemblies (www.A2Mac1.com). 1,2 These lightweight assemblies are challenging for joining by conventional resistance spot welding, friction stir spot welding, and self-piercing riveting. Joining of dissimilar thicknesses with different properties, for example, melting point, thermal conductivity, density, Young's modulus, and intermetallic formed compounds require the use of the mechanical clinching (MC) process.…”