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Study on Theory and Application of the Energy Method used for Analyzing Compressive Instability in Sheet Forming

厦门大学学报（自然科学版） 2002年第S1期41卷 126-127页

作者： XIOng Zhi-qing 1, XIE Lan-sheng 2 (1. dep.r.ment of mechanical engineer.ng, Nanjing Institute of Techno logy, Nanjing 210013, China 2. College of mechanical and Electrical engineer.ng, Nanjing univ.r.ity of aer onautics and Astronautics, Nanjing 210016, China)

It is pointed out that there was serious weakness w he n using the energy method for studying compressive plastic instability in sheet forming in the past. Where applying the deduced instability strengths to relativ e engineer.ng analysis, theoretical solutions were away from practices. Its basi c reason is that simplified process in mathematical analysis of elastic bending energy was completely applied to that of plastic bending energy. Where the cambe r expressed by function of displacement normal to a plate was approximated to re alistic deflective camber, the displacement of deflected plate to compressed dir ection was neglected. With the aid of the improved instability strengths, the pr edictions on both critical buckling dimension of blank in cup deep-drawing with out blankholder through cylindrical die or conical die and the minimum blankhold er pressure to prevent buckling under constant load are universally in agreement with both experimental results and experiential data. On the bases of above-mentioned improvement, the approximate expressions for bo th the curvature and the twist used in equation of the energy of elastic bending are also ameliorated. Thus the obtained general equations for both the energy a nd the work done by internal force in plastic bending of a plate are more precis e than before. In the analyses of plastic buckling of shell with bending moment, the effect of bending moment is considered through the work done by simulative bending for ce. The method proposed in this paper can not only simplify analyses but also ge t practical result.

关键词： sheet forming deep-drawing buckling energy me thod

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DC dielectrophoresis separation of marine algae and particles in a microfluidic chip

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Science China Chemistry 2012年第4期55卷 524-530页

作者： SOng YongXin1, YAng JianDong1, SHI XiaoFei4. JIAng Hai3, WU YanBin1, PEng ran1, WAng Qi5, GOng Ning2, PAN XinXiang1, SUN YeQing2 & LI DongQing1,31dep.r.ment of marine engineer.ng, Dalian maritime univ.r.ity, Dalian 116026, China 2Institute of Environmental Systems Biology, Dalian maritime univ.r.ity, Dalian 116026, China 3dep.r.ment of mechanical and Mechatronics engineer.ng, univ.r.ity of Waterloo, Waterloo, ON, N2L 3G1, Canada 4.ollege of Information Science and Technology, Dalian maritime univ.r.ity, Dalian 116026, China 5dep.r.ment of respiratory Medicine, the Second Hospital Affiliated to Dalian Medical univ.r.ity, Dalian 116026, China 1. dep.r.ment of marine engineer.ng Dalian Maritime University Dalian 116026 China4. College of Information Science and Technology Dalian Maritime University Dalian 116026 China3. Department of Mechanical and Mechatronics Engineering University of Waterloo Waterloo ON N2L 3G1 Canada5. Department of Respiratory Medicine the Second Hospital Affiliated to Dalian Medical University Dalian 116026 China2. Institute of Environmental Systems Biology Dalian Maritime University Dalian 116026 China

This paper reports a microfluidic method of continuous separation of marine algae and particles by DC dielectrophoresis. The locally non-uniform electric field is generated by an insulating PDMS triangle hurdle fabricated within a PDMS microchannel. Both the particles and algae are subject to negative dep forces at the hurdle where the gradient of local electric-field strength is the strongest. The dep force acting on the particle or the algae depends on particles' or algae's volume, shape and dielectric properties. Thus the moving particles and algae will be repelled to different streamlines when passing the hurdle. In this way, combined with the electroosmotic flow, continuous separation of algae of two different sizes, and continuous separation of polystyrene particles and algae with similar volume but different shape were achieved. This first demonstration of DC dep separation of polystyrene particles and algae with similar sizes illustrates the great influence of dielectric properties on particle separation and potentials for sample pretreat{4..

关键词： DC dielectrophoresis – marine algae – particle – microfluidic chip – permittivity difference

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基体材料力学性能对316L不锈钢颗粒沉积行为的影响

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金属学报 2016年第12期52卷 1610-1618页

作者：马广璐崔新宇沈艳芳 Nuria CINCA Josep M.GUILEmaNY 熊天英中国科学院金属研究所沈阳110016 Thermal spray center (CPT) University of Barcelona

研究了基体材料的力学性能对冷喷涂316L不锈钢单颗粒沉积行为的影响.结果表明,除硬度之外,弹性模量和Poisson比也会影响颗粒的沉积行为.这是由于基体性质对颗粒/基体的能量分配和结合机制造成了影响.其中,沉积颗粒的变形行为与颗粒吸收... 详细信息

研究了基体材料的力学性能对冷喷涂316L不锈钢单颗粒沉积行为的影响.结果表明,除硬度之外,弹性模量和Poisson比也会影响颗粒的沉积行为.这是由于基体性质对颗粒/基体的能量分配和结合机制造成了影响.其中,沉积颗粒的变形行为与颗粒吸收的能量有关,而沉积效率与基体吸收的能量及结合机制有关.根据沉积颗粒的变形行为,将基体分为2类:颗粒几乎不变形,此时基体的硬度和弹性模量皆低于颗粒材料,颗粒与基体的结合主要是机械咬合,推导出可用于推断相同颗粒在基体上沉积趋势的参数E_(para),并以AZ91镁合金为基体进行验证;颗粒发生强烈变形,此时基体的硬度或弹性模量高于颗粒材料,结合机制更为复杂,此时增加颗粒/基体新鲜表面接触面积有利于提高沉积效率.

关键词： 316L不锈钢基体力学性能沉积行为

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