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- 저자 : Zihao Jiang (검색결과 3 건)
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Zihao Jiang,Yayun Li,Hang Luo,Baogang Zhou,Yilong Liang,Yu Liang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12
The present work investigated the effect of the boundary orientation of melt pool on the mechanical properties and fracturepath in selective-laser-melted AlSi10Mg alloy. The acquired data are beneficial for understanding the influence of themicrostructure on mechanical properties. During the alloy’s selective laser melting (SLM), the melt pool boundary wasalmost parallel with the scanning direction, and the grains grew along the building direction. When the load-bearing facewas perpendicular to the melt pool boundary, the crack propagation path deflected towards coarse melt pool of the melt poolboundary, reducing the probability of directly crossing the fine melt pool. Otherwise, the cracks would mainly propagatealong the melt pool boundary. In the tensile deformation process, coarse melt pool (CMP) was subjected to higher localstrain than fine melt pool (FMP) and heat-affected zone (HAZ), and the crack propagated or deflected along the CMP inthe melt pool boundary. Therefore, the anisotropy of mechanical properties in SLM AlSi10Mg was mainly ascribed to theCMP density on the load-bearing face. As a weak area, the high proportion of CMP significantly reduced the strength andplasticity of the alloy.
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Zihao Wu,Zhenzhong Chen,Ge Chen,Xiaoke Li,Chen Jiang,Xuehui Gan,Haobo Qiu,Liang Gao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
Time-variant reliability-based design optimization (T-RBDO) issues are probabilistic design problems that assess the dependability of the design across time. The engineering situation is most closely resembled by it. The approaches to resolving T-RBDO problems, nevertheless, are convoluted and time-consuming. In this paper, an effective strategy for solving RBDO issues are extended to resolving TRBDO problems in order to increase efficiency. To solve T-RBDO challenges, the time-variant probabilistic feasible region (T-PFR) approach, which is based on the PFR method for resolving RBDO issues, was presented. The idea of the equivalent inverse most probable point (EIMPP) is put out in this methodology. Based on the EIMPP, the probabilistic feasible region is likewise developed for time-variant constraints. The effective tactic of the proposed method is to identify the non-active time-variant constraints using the probabilistic feasible region and to forego conducting time reliability analysis on them. Three mathematics and two engineering issues demonstrate that the suggested solution is viable and effective.
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Zihao Wu,Zhenzhong Chen,Ge Chen,Xiaoke Li,Chen Jiang,Xuehui Gan,Haobo Qiu,Liang Gao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.9
An effective method for reliability-based design optimization (RBDO) problems taking uncertainties into account is the probabilistic feasible region (PFR) approach. The PFR approach is built around the fixed nature of the standard deviation in general RBDO problems. Therefore, the accuracy of the PFR approach will be affected when dealing with RBDO problems with varying standard deviation. To improve the accuracy of PFR method in solving the RBDO problems with varying standard deviation, a novel probabilistic feasible region strategy considering varying standard deviations (PFR-vstd) approach is suggested in this paper. In place of the initial probabilistic feasible region in standard normal space, a new probabilistic feasible region is established in original design space in this novel approach. The results of four applications demonstrate the high accuracy and sufficient efficiency of PFR-vstd method. The findings demonstrate that PFR-vstd method is capable of accurately resolving RBDO problems with varying standard deviation.
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