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- 저자 : Huapu Sha (검색결과 2 건)
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Tao Zhang,Huapu Sha,Lei Li,Hai Gong 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.1
Superplastic forming/ diffusion bonding (SPF/DB) is a key technology for preparation of light-weight and integrated multilayer structures as superplastic deformation and diffusion joints can be achieved in one heat cycle. However, groove defects and inhomogeneous sheets thickness distribution usually appear during SPF/DB, which decreases the mechanical properties of multi-layer structures. In this study, numerical models of four-layer honeycomb and hollow blade structure are established and the effects of forming parameters (thickness ratio, strain rate, DB distance and width) on groove defect and thickness distribution are analyzed. The results show that groove defect for honeycomb structure can be eliminated under proper thickness ratio between face sheet to core sheet. The groove defect decreases with increasing DB distance and decreasing DB width. Insufficient deformation of vertical stiffener is the main problem for hollow blade structure and it can be improved by adjustment of the sheets thickness and the strain rate. Experiments are conducted on the basis of optimized parameters from simulation and agree with results from FEM. This study provides guidance for parameters selection for manufacturing of Ti–6Al–4V multi-layer structure.
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Study on flexible two-axis roll-bending process for component with non-circular section
Tao Zhang,Huapu Sha,Shihong Lu,Chao Du,Peng Chen 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9
Two-axis roll-bending technology, with the advantages of small curvature radius, short straight section and high efficiency, is widely used in fields of aerospace and automobile. By adjusting indentation depth in two-axis roll-bending process, different curvature radius of circular and elliptic component can be formed. Roll-bending experiments and numerical simulations for component with circular and elliptic section are conducted. The results show that the forming curvature radius of circular component and its deviation both decrease with ascending indentation depth. The relationship between forming curvature radius and indentation depth is polynomial fitted. On this basis, ellipse parameter equation is established and different curvature radius at different position of the ellipse is achieved by adjustment of indentation depth. The relationship between indentation depth and forming time is obtained for elliptic component. Elliptic components with different sizes are formed. The stress distribution is uniform after roll-bending process and it increases with ascending indentation depth.
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