The authors hereof have studied how the thickness of 0.08% carbon cold-rolled sheet steel affects its properties. They experimented with tensioning such sheets and plotted the metal hardening curves. The paper presents comparative analysis of how the material thickness affects the coefficients approximating the hardening curves. A comparison of the hardening curves of control and annealed specimens is given. Experiments have identified the effects that the pre-accumulated plastic strain has on the material properties. It is revealed that lower thickness alters the force parameters of the process and affects the ultimate tensile strain. The paper formulates recommendations on using the estimates obtained by the software simulation of the deformation process. Hardening-curve coefficients approximation functions are proposed in order to predict how changing the thickness would affect the material properties.
The article is about a small-sized experimental-industrial profile-bending machine of new design intended for further researches, production of thin-walled profiles and use in educational process. The authors proposed to create the first stand with indenters extruding service grooves in tape to reduce losses for excess deformation and friction, as well as to simplify configuration and reduce the cost of tooling.
Commonly investigated problem on composite fabrication and forming for weight reduction in transportation and aerospace area is not completely cleared. The main difficulties on composites forming without building any defects caused new ways on process characterization due to the key parameters. In the paper two main problems were investigated, i.e. material fracture and material thinning during deep drawing. Through mechanical tests and numerical simulation the authors tried to couple the fracture with the technological boundary conditions of the deep drawing process and form a housing test part from a three-layer material.
The article describes the multi-layered deformable materials, which can reduce the noise level. Possibility of deformation of multi-layer billets, which provide a high noise protection and noise insulation, is estimated.
The accuracy of the simulation results of stamping processes of thin sheet material depends on the correct properties’ specification, namely stamping ability. Experiments have been carried out and the influence of the deformation speed on the hardening exponent during cold sheet metal forming was studied. It was found out, that strain changed 100 times can influence the strain grade of the hardening curve of about 10%. This regularity has been taken into consideration prior to the calculation in any CAE-software for material forming.
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