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In this paper, the plastic flow curve of commercially pure titanium sheet (CP Ti) has been evaluated using Tensile test and Hydraulic bulge test. The plastic flow curve known as hardening curve is a key on factor needed in conducting finite element analysis for the forming process of sheet material. However, several sheet forming processes lead to the large plastic deformation of which the plastic strain is over the maximum uniform elongation of uniaxial tensile test, for instance, clinch forming, hydroforming, stamping and deep drawing. Therefore, we have performed tensile and a hydraulic bulge test for CP Ti sheet. We also have used and evaluated three method that convert from hydraulic bulge flow curve to tensile flow curve. The measured true flow curve from the hydraulic bulge test can be fitted well by the hardening equation known as Kim-Tuan model.
To investigate the effect of material and precess variables on stamping formability of sheet materials, simulations for the cup drawing and the Yoshida buckling test were carried out using ABAQUS, commercial nonlinear finite element analysis code. The various factor effects on stamping formability of sheet materials were analyzed by the designed process according to Taguch's orthogonal array experiment. Cup drawing simulation showed that local neckling was very sensitive to plastic anisotropy parameter of sheet material and friction coefficient between sheet and tool interface. Simulations for the Yoshida buckling test have clarified that buckling behaviour of sheet material was mostly susceptible to yield stress and sheet thickness mostly. However, plastic anisotropy parameter and strain hardening coefficient affect moderately buckling behaviour of steel sheets after the buckling initiation.
In this study, an information transmission device for an Adaptive Cruise Control System has been designed to provide a driver with the system. The driver car, and other cars. A Simulator experiment has been carried out to investigate the effectiveness of the device by measuring headway-time and standard deviation of lateral position. The study shows that the drivers keep longer distance with preceding cars when the information is provided by the device.