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| 1 | Design and Mechanical Characterization of an S-Based TPMS Hollow Isotropic Cellular Structure显示文摘Cellular structures are regarded as excellent candidates for lightweight-design,load-bearing,and energy-absorbing applications.In this paper,a novel S-based TPMS hollow isotropic cellular structure is proposed with both superior load-bearing and energy-absorbing performances.The hollow cellular structure is designed with Boolean operation based on the Fischer-Koch(S)implicit triply periodic minimal surfaces(TPMS)with different level parameters.The anisotropy and effective elasticity properties of cellular structures are evaluated with the numerical homogenization method.The finite element method is further conducted to analyze the static mechanical performance of hollow cellular structure considering the size effect.The compression experiments are finally carried out to reveal the compression properties and energy-absorption characteristics.Numerical results of the Zener ratio proved that the S-based hollow cellular structure tends to be isotropic,even better than the sheet-based Gyroid TPMS.Compared with the solid counterpart,the S-based hollow cellular structure has a higher elastic modulus,better load-bearing and energy absorption characteristics. | Junjian Fu Pengfei Sun Yixian Du Lei Tian Qihua Tian Xiangman Zhou | 2022 | Computer Modeling in Engineering & Sciences2022，，5： | 0 |
| 2 | A review on magnesium alloys for application of degradable fracturing tools显示文摘The vulnerable corrosion resistance of Mg alloys is regarded as one of the main disadvantages restricting their application,while it can be used as an extraordinary specialty in some particular fields,such as petroleum exploitation and medicine.In recent years,many Mg alloys with high corrosion rate and high strength have been developed for fracturing temporary plugging tools in the oil exploitation.This review briefly introduces the performance requirements of the degradable fracturing tools classified into mechanical and corrosion properties.Recent progress on corrosion behavior of degradable Mg-Al,Mg-Zn,Mg-RE alloys and Mg matrix composites is then summarized and discussed.Finally,the factors influencing the degradation rate of Mg alloys are analyzed and divided into secondary phase,texture,dislocation,grain size and surface film.From the summary,it can be found that addition of Ni or Cu to the degradable Mg alloys is a common and effective method to enhance the degradation rate due to increasing the amount of secondary phases and deteriorating the corrosion product layers.For the as-extruded degradable Mg alloys,grain size,texture and dislocation are the key factors affecting the corrosion rate under different processing conditions.We expect this review is helpful for those who are working on developing Mg-based functional materials with superior degradation rate. | Jian Sun Wenbo Du Junjian Fu Ke Liu Shubo Li Zhaohui Wang Hongxing Liang | 2022 | Journal of Magnesium and Alloys2022，10，10： | 0 |
| 3 | Calibration and verification of streaked optical pyrometer system used for laser-induced shock experiments显示文摘Although the streaked optical pyrometer(SOP)system has been widely adopted in shock temperature measurements,its reliability has always been of concern.Here,two calibrated Planckian radiators with different color temperatures were used to calibrate and verify the SOP system by comparing the two calibration standards using both multi-channel and single-channel methods.A high-color-temperature standard lamp and a multi-channel filter were specifically designed for the measurement system.To verify the reliability of the SOP system,the relative deviation between the measured data and the standard value of less than 5%was calibrated out,which demonstrates the reliability of the SOP system.Furthermore,a method to analyze the uncertainty and sensitivity of the SOP system is proposed.A series of laserinduced shock experiments were conducted at the‘Shenguang-Ⅱ’laser facility to verify the reliability of the SOP system for temperature measurements at tens of thousands of kelvin.The measured temperature of the quartz in our experiments agreed fairly well with previous works,which serves as evidence for the reliability of the SOP system. | Zhiyu He Guo Jia Fan Zhang Xiuguang Huang Zhiheng Fang Jiaqing Dong Hua Shu Junjian Ye Zhiyong Xie Yuchun Tu Qili Zhang Erfu Guo Wenbing Pei Sizu Fu | 2019 | High Power Laser Science and Engineering2019，7，3： | 0 |
| 4 | An Innovative Finite Element Geometric Modeling of Single-Layer Multi-Bead WAAMed Part显示文摘Finite element (FE) coupled thermal-mechanical analysis is widely used to predict the deformation and residualstress of wire arc additive manufacturing (WAAM) parts. In this study, an innovative single-layermulti-bead profilegeometric modeling method through the isosceles trapezoid function is proposed to build the FE model of theWAAMprocess. Firstly, a straight-line model for overlapping beads based on the parabola function was establishedto calculate the optimal center distance. Then, the isosceles trapezoid-based profile was employed to replace theparabola profiles of the parabola-based overlapping model to establish an innovative isosceles trapezoid-basedmulti-bead overlapping geometric model. The rationality of the isosceles trapezoid-based overlapping model wasconfirmed by comparing the geometric deviation and the heat dissipation performance index of the two overlappingmodels. In addition, the FE-coupled thermal-mechanical analysis, as well as a comparative experiment of thesingle-layer eight-bead deposition process show that the simulation results of the above two models agree with theexperimental results. At the same time, the proposed isosceles trapezoid-based overlappingmodels are all straightlineprofiles, which can be divided into high-quality FE elements. It can improve the modeling efficiency andshorten the simulation calculation time. The innovative modeling method proposed in this study can provide anefficient and high-precision geometricmodelingmethod forWAAMpart FE coupled thermal-mechanical analysis. | Xiangman Zhou Jingping Qin Zichuan Fu Min Wang Youlu Yuan Junjian Fu Haiou Zhang Seyed Reza Elmi Hosseini | 2024 | Computer Modeling in Engineering & Sciences2024，138，3： | 0 |
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