Finite element analysis of the plastic deformation zone and working load in equal channel angular extrusion

Effect of Severe Plastic Deformation on the Properties and Structural Developments of high purity Al and Al-Cu-Mg-Zr Aluminium Alloy

“…Reported by authors (Beyerlein et al, 2004); (Stoica et al, 2005) this low level is characterizing by straining way in deformation zone which is more bending as plastic flowing. Mutual comparison of shearing strain angles obtained from experiment and numerical simulation reference to high conformity of results.…”

“…A higher mesh density offers increased accuracy and resolution of geometry, on the other the time required for the computer to solve the problem increases as number of nodes increases. An optimal meshing density has to be chosen according to the geometry and size of object according in (Kvačkaj et al, 2007); (Kočiško et al, 2009); (Li et al, 2004) specimen with diameter d 0 = 10 mm has been decided using 20 elements along the width. Hence, the specimen with diameter d 0 = 10 mm and length l 0 = 80 mm was meshed with 3000 elements, that's to say 28 elements on the specimen diameter, as shown in Fig.…”

“…Some difference was observed only in 1/5 bottom sample part where preferable deformation is bending. The ECAP channel filling by processing material has influence on distribution of effective plastic deformation, which depends on: contact friction, stress -strain (σ-ε) curves characterizing deformed material and geometrical definition of ECAP die (Li et al, 2004). For numerical simulation of 1 st ECAP pass geometrical definition of channels was as follow: Φ = 90°, R = 0 mm and r = 0 mm.…”

“…In the past decade, the research focused on to strengthen Al alloys without any ageing treatment, via SPD (Kvačkaj et al, 2010 b). The finite element method (FEM) is a proven and reliable technique for analyzing various forming processes (Kvačkaj et al, 2007); (Kočiško et al, 2009); (Li et al, 2004); (Leo et al, 2007); (Cerri et al, 2009), (Figueiredo et al, 2006); (Mahallawy et al, 2010); (Yoon & Kim, 2008), in order to analyze the global and local deformation response of the workpiece with 4 nonlinear conditions of boundary, loading and material properties, to compare the effects of various parameters, and to search for optimum process conditions for a given material (Kim, 2001). The unique mechanical properties of the ECAPed material are directly affected by plastic deformation.…”

Effect of die shape on the metal flow pattern during direct extrusion process

“…The strain inhomogeneity decreases with the increasing of the fillet radius of the die and the lowest one was obtained for the fillet radius of r f = 3.0 mm. The strain distribution and other important variables that influence material structure, such as hydrostatic stress, are strongly dependent on the geometry of the extrusion dies [26][27][28][29] . This correlation between die fillet radius and the flow uniformity is also confirmed by the results of calculation of other process parameters like velocity, shown in figure 6, and hydrostatic pressure, shown in figure 9.…”