Determination of the flow stress of five AHSS sheet materials (DP 600, DP 780, DP 780-CR, DP 780-HY and TRIP 780) using the uniaxial tensile and the biaxial Viscous Pressure Bulge (VPB) tests

Constitutive flow behavior of IFAC-1 austenitic stainless steel depicting strain saturation over a wide range of strain rates and temperatures

“…The uniqueness of the behavior catches the imagination of researchers to explore the relationships between parameters that affect the behavior of the material. Though the flow behavior of a particular material depends on many factors such as thermo-mechanical history [31] defects present, defects generated [32], and state of stress [33], on a larger scale the flow behavior depends on deformation level (i.e. strain), rate of deformation (strain rate) and the temperature at which the material is deformed.…”

Overview on constitutive modeling for hydroforming with the existence of through-thickness normal stress

“…Compared with other methods in determining the flow stress curve, such as cruciform-biaxial, torsion, shear and moment-curvature, the bulge test is more reliable for diffuse necking regions. Nasser et al (2010) suggested another bulge formulation based on Hill90 anisotropic yield criterion to obtain the flow stress curves of five advanced high-strength steel (AHSS) sheet materials.…”

Reduction of Induced Central Damage in Cold Extrusion of Dual-Phase Steel DP800 Using Double-Pass Dies

“…Die design has to be optimal in order to increase the tool life and to produce products of the required quality; however, studies about other related topics such as the optimization of multi-axis high-speed milling are also becoming very important when dies of complex shape have to be manufactured [3], as well as the improvement in finishing operations of forming tools, as in the work of López de Lacalle et al [4], especially focused in the machining of AHSS. Dual-Phase steels (DP) are one interesting group of AHSS, whose microstructure is mainly composed of soft ferrite, with islands of hard martensite dispersed throughout [5]. Thus, the strength level of these steels is related to the amount of martensite in the microstructure.…”