[PDF] Top 20 Investigation of the Formability Enhancement of DP600 Steel Sheets in Electrohydraulic Die Forming

... Wood (1967) concluded that the increase in formability mainly resulted from the fact that the material’s constitutive behaviour changes at high strain rate. The increasing rate of strain hardening has a positive ... See full document

... the formability of dual phase ...The DP600 manufacturer generally does not conduct internal formability experiments and instead provides its customers with the theoretical FLC because it is normally ... See full document

... in forming speed will give better ...warm forming experiments on AA7xxx- series channel sections at two different initial blank temperatures (187 and 253°C) with room temperature ...during forming, ... See full document

... the die formed samples in ...quasi-static forming limit, which was attributed to inertia in the plastic flow instability, as described by Drucker ...sheet formability enhancement at ... See full document

... A common method used for the determination of material flow stress is the application of compression test. At a low strain rate and deformation, the precise flow stress can be obtained. However, at large deformation, the ... See full document

... using the natural patterns of microstructures [9, 14]. Ososkov et al [15] measured the local strain partitioning in a DP600 steel during the uniform plastic deformation stage of tensile tests by using both ... See full document

... The relation of the data derived from the standard tensile test to the necessary input parameters is examined and a method for accommodating some specifics of α-titanium plasticity in the Barlat 1989 material model is ... See full document

... particular forming process as a separate chapter. The present investigation has been undertaken with a view to study the effect of friction on deformation characteristics of sintered preform under flow ... See full document

... The effect of the skin-pass strain on the final formability of the sheets was studied in set B. For this reason, different amounts of cold reduction were applied using a laboratory rolling machine on 40 cm ... See full document

... temperature of tool surface at the center of upper die (or punch) was chosen as shown in Fig. 12. Figure 12(a) shows the tool temperature histories for both thicknesses during the cycle. The maximum temperatures ... See full document

... depth range of 0.5 to 1mm (levels 1 to 4 in Table 1). By increasing the vertical step, the axial force of the tool increases and a deeper micro valley will occur on the surface of the mild steel sheet. Moreover, ... See full document

... The formability of tempered Cu alloy sheets depends pri- marily on non-uniform elongation, because of low n ...bend formability to take the place of n has been ... See full document

... 2 of materials[2]. This goal can be achieved by the propagation of high-intensity vibration into the sheet metal that influences the microstructural and mechanical properties [3]. Generally, volume effect and surface ... See full document

... When a materials property of cast iron is examined, it is important that the relation among tensile strength, elongation and hardness is clarified. Generally, the tensile strength increases with increasing the hardness ... See full document

... It is well known, for modified material to have polymeric properties it is necessary to create a polymer framework in substance space, which is possible with a critical concentration of forming structure. If the ... See full document

... required forming force during the operation and hypothesize that this is due at least in part to lubricant entering through gaps between the workpiece and die which are created due to the difference in ... See full document

... The used surface to surface contact algorithm was automatic to define the interfaces between the surfaces of the tooling and the sheet. This algorithm is based on the penalty method. Coulomb friction model with a ... See full document

... preliminary investigation violations, timely elimination of which could help to avoid new investigation of judicial ...preliminary investigation, which, due to the notorious specifics of trial ... See full document

... the formability of ...hydraulic forming was investigated by means of experimental and computational ...Electro-hydraulic forming tests were carried out on sheet specimens using 34, 40 and 45 ◦ ... See full document

... into die cavity the blank is subjected to different type of ...the steel blank into ductile fracture much faster ...the die opening under the drawing limit without failure ...And forming limit ... See full document