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Cited by 3 publications
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多场调控金属激光增材制造研究现状与展望（特邀）
Significance Laser additive manufacturing (LAM) technology uses a focused highenergy laser beam as the heat source to achieve integrated forming of complex metal components, avoiding the complex postprocessing steps of traditional processing techniques and achieving high forming efficiency, which makes it have broad application prospects in aerospace, automotive, medical and other fields. The metal additive manufacturing process based on laser and powder mainly includes two types: selective laser melting (SLM) and laser directed energy deposition (LDED). LAM has been widely used in the forming of various metal materials, including aluminum alloys, titanium alloys, copper alloys, nickelbased superalloys, magnesium alloys, steel, and so on.Due to the current widespread use of Gaussian laser in laser additive manufacturing technology, the peak intensity generated in the focusing area is very high. When laser interacts with metal powder, the widthtodepth ratio of the melt pool is small and there are large temperature gradient and cooling rate. The instability caused by complex melt flow dynamics and the accumulation of repeated heating and cooling cycles are prone to keyholes, splashing, spheroidization, residual stress, cracks, and anisotropic microstructures, which seriously affect the strength, toughness, and fatigue resistance of formed components in turn. Modifying the alloy composition 1002306 -23 特邀综述 第 51 卷 第 10 期/2024 年 5 月/中国激光 or adding strengthening phase particles can effectively eliminate the cracks and anisotropic columnar crystal structure in metal samples.
多场调控金属激光增材制造研究现状与展望（特邀）
Significance Laser additive manufacturing (LAM) technology uses a focused highenergy laser beam as the heat source to achieve integrated forming of complex metal components, avoiding the complex postprocessing steps of traditional processing techniques and achieving high forming efficiency, which makes it have broad application prospects in aerospace, automotive, medical and other fields. The metal additive manufacturing process based on laser and powder mainly includes two types: selective laser melting (SLM) and laser directed energy deposition (LDED). LAM has been widely used in the forming of various metal materials, including aluminum alloys, titanium alloys, copper alloys, nickelbased superalloys, magnesium alloys, steel, and so on.Due to the current widespread use of Gaussian laser in laser additive manufacturing technology, the peak intensity generated in the focusing area is very high. When laser interacts with metal powder, the widthtodepth ratio of the melt pool is small and there are large temperature gradient and cooling rate. The instability caused by complex melt flow dynamics and the accumulation of repeated heating and cooling cycles are prone to keyholes, splashing, spheroidization, residual stress, cracks, and anisotropic microstructures, which seriously affect the strength, toughness, and fatigue resistance of formed components in turn. Modifying the alloy composition 1002306 -23 特邀综述 第 51 卷 第 10 期/2024 年 5 月/中国激光 or adding strengthening phase particles can effectively eliminate the cracks and anisotropic columnar crystal structure in metal samples.
基于胞元堆叠的拉伸‐扭转耦合变形结构设计与增材制造验证（特邀）
Objective Morphing aircrafts can change their shape according to different flying environment and conditions, which makes their aerodynamic efficiency much better than traditional aircrafts. In order to achieve multidimensional deformation, mechanical metamaterials that exhibit designable morphing capability have been widely studied. Particularly, structures with coupled tensiontsist characteristics are necessary in case that attacking angle should be changed to adjust the aerodynamic load distribution on the wing surface. Therefore, this study proposes a novel metamaterial structure that can exhibit coupled tension -twist deformation, which significantly increases the twisting angle of a cross section under axial loading. The methodology of this study can provide valuable guideline for the future design of morphing aircrafts.Methods Models of the metamaterial cell structure were built using beam elements. Two types of beam structures with different coupled tension-twist properties were designed by cell stacking. The stiffness and coupled tension-shear deformation of the cells were studied by finite element analysis (FEA). After the cells were stacked, the coupled tension-shear deformation of the cells transformed into coupled tension-twist deformation of the beam structures. The deformation capabilities of the beams and related parameters were then investigated. Finally, samples of different lengths of two types of beams were prepared by selective laser sintering (SLS) of PA12 material for experimental verification. Samples were loaded by hanging weights on the free end, and the other end was fixed by an industrial bench vice. The twist angle was measured indirectly using a laser sensor. Results and DiscussionsThe beams were designed with the ability to exhibit coupled tension -twist deformation with a twist angle higher than 15°. Results show that the twist angle of the four cells combination cantilever beam is significantly greater than that of the two cells combination cantilever beam. Under a tensile load of 46.69 N, the twist angles of the aforementioned beams are 0.667° and 0.479°, respectively, with the results being consistent with the FEA. In addition, weights of the four and two cells combination cantilever beams are 319.94 and 311.32 g, respectively. This means that with 2.77% greater weight, the value of the coupled tension-twist parameter increases by 42.97%. The twist angle for the cantilever beams is shown to increase linearly with the number of stacked cells, which enables a larger twisting angle if needed.Conclusions In this study, a novel mechanical metastructure with coupled tension -twist deformation capability is proposed. The metastructures can transform the coupled tension -shear deformation of unit cells into coupled tension -twist deformation of beams by cell stacking, which can significantly improve section twist angle under axial loads. The proposed designing method is verified by finite element modeling and experimental testing of beam samples.
RGO/Fe3O4/PLA复合吸波剂组合及分布方式对角锥吸波性能的影响
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