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        Research on the Effect of Flow Stress Calculation on Aluminum Alloy Sheet Deformation Behavior Based on Warm Bulging Test

        Gaoshen Cai,Lihui Lang,Kangning Liu,Sergei Alexandrov,Dongxing Zhang,Xiying Yang,Chan Guo 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.2

        Confirmation of material properties is an important research area for determining metals deformation behavior. In order to research the effect of flow stress calculation on aluminum alloy sheet deformation behavior,warm sheet bulging test was carried out to obtain bulging height - pressure curves with different bulging heightsand diameters in this study. Based on the bulging parts profile data measured by three coordinate measuringmachine, the least square circle fitting radius were fitted. Existing theoretical models for radius of curvatureand thickness were compared and best models were selected to obtain more accurate stress - strain curves bycalculating the bulging flow stress. Combination model was used to calculate the bulging height - pressurecurves obtained by bulging test and the stress-strain curves with different temperatures and pressure rates wereobtained. A monotonous increasing function was resulted which is of great significance in the area of formabilityand deformation behavior of warm sheet hydroforming.

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        Study on Thermodynamic Behavior, Microstructure and Mechanical Properties of Thin-Walled Parts by Selective Laser Melting

        Biao Hu,Gaoshen Cai,Jinlian Deng,Kai Peng,Bingxu Wang 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1

        To investigate the thermodynamic behavior of thin-walled parts fabricated by selective laser melting, an indirect sequentiallycoupled thermal–mechanical numerical modeling was developed. The three-dimensional Gaussian attenuation bodyheat source model and thermophysical parameters varying with temperature were considered. To validate the numericalmodel, the thin-walled part was manufactured by selective laser melting, and the experiment results were compared with thesimulation results. It is found that the variation trend of residual stress in simulation and experiment is in good agreement. Moreover, The microstructure and mechanical properties of the thin-walled parts were analyzed. The simulation resultsshow that the thermal conductivity and the heat accumulation have a critical influence on the evolution of the molten pooland cooling rate. The thermal stress along the laser scanning direction is larger than the other two directions, and the highstressarea is mainly distributed in the middle position of the part and the joint of the part and the substrate. Besides that, theX-component of stress of the top layer gradually decreases as the deposition layer increases. The experiment results showthat the microstructure of thin-walled parts is mainly composed of acicular martensite under the action of complex thermalcycle. The fracture mode of thin-walled parts show a typical quasi-brittle fracture.

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