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金属粉末激光烧结温度场的三维有限元模拟 被引量:10
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作者 郭华锋 周建忠 胡增荣 《工具技术》 北大核心 2006年第11期13-18,共6页
综合考虑热传导、热辐射和热对流及变热物性参数,基于ANSYS平台建立了连续移动的三维瞬态金属粉末直接激光烧结温度场的有限元模型;利用APDL参数化设计语言实现热源移动,利用焓处理相变潜热的影响,对水雾化铁粉的烧结成型温度场进行了模... 综合考虑热传导、热辐射和热对流及变热物性参数,基于ANSYS平台建立了连续移动的三维瞬态金属粉末直接激光烧结温度场的有限元模型;利用APDL参数化设计语言实现热源移动,利用焓处理相变潜热的影响,对水雾化铁粉的烧结成型温度场进行了模拟,系统分析了激光熔池的加热和冷却规律及温度场随时间的变化规律。模拟结果表明:随着时间的增加,由于热积累效应使得激光熔池的温度越来越高;彗星状温度云图的最高温度并不在激光光斑中心而是稍微滞后;模拟结果显示烧结过程中将产生液相,这与先前的实验结果吻合较好。 展开更多
关键词 DMLS 瞬态温度场 相变潜热 有限无模拟
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Combined method for fast 3-D finite element modeling of nondestructive testing signal 被引量:1
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作者 林鹤云 《Journal of Southeast University(English Edition)》 EI CAS 2004年第2期195-199,共5页
A combined method for the fast 3-D finite element modeling of defect responses in nondestructive testing of electromagnetics is presented. The method consists of three numerical techniques: zoom-in technique, differen... A combined method for the fast 3-D finite element modeling of defect responses in nondestructive testing of electromagnetics is presented. The method consists of three numerical techniques: zoom-in technique, difference field technique and iterative solution technique. Utilizing the zoom-in technique, the computational zone focuses on a relatively small domain around the defect. Employing the difference field technique, the axisymmetrical field solution corresponding to the case with no defect can be used to simplify the mesh generation and obtain the modeling results quickly. Using the iterative solution technique, the matrix equation system in the 3-D finite element modeling of nondestructive probe signals can easily be solved. The sample calculation shows that the presented method is highly effective and can consequently save significant computer resources. 展开更多
关键词 Electromagnetic fields Finite element method Iterative methods Probes
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Elastic-plastic properties of thin film on elastic-plastic substrates characterized by nanoindentation test 被引量:3
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作者 蒋丽梅 周益春 黄勇力 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第12期2345-2349,共5页
To characterize the elastic-plastic properties of thin film materials on elastic-plastic substrates,a simple theory model was proposed,which included three steps:dimensionless analysis,finite element modeling and data... To characterize the elastic-plastic properties of thin film materials on elastic-plastic substrates,a simple theory model was proposed,which included three steps:dimensionless analysis,finite element modeling and data fitting.The dimensionless analysis was applied to deriving two preliminary nondimensional relationships of the material properties,and finite element modeling and data fitting were carried out to establish their explicit forms.Numerical indentation tests were carried out to examine the effectiveness of the proposed model and the good agreement shows that the proposed theory model can be applied in practice. 展开更多
关键词 elastic-plastic thin film nanoindentation test dimensionless analysis finite element analysis
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Finite element simulation of wireless structural vibration control with photostrictive actuators 被引量:9
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作者 ZHENG ShiJie 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期709-716,共8页
A recently emerging family of smart materials,photostrictive materials,exhibit large photostriction under uniform illumination of high-energy light.This photostriction mechanism arises from a superposition phenomenon ... A recently emerging family of smart materials,photostrictive materials,exhibit large photostriction under uniform illumination of high-energy light.This photostriction mechanism arises from a superposition phenomenon of photovoltaic and converse piezoelectric effects.A photostrictive type of opto-electromechanical actuator activated by high-energy lights can introduce actuation and control effects without hard-wired connections.The control light intensity applied to the actuator is proportional to the transverse velocity at a positioned point,which is measured by a laser vibrometer.In this paper,photostrictive films are numerically analyzed to evaluate their use as wireless actuators for future remote vibration control of flexible structures.A novel opto-electromechanical solid shell finite element formulation is developed for accurate analysis of the multiple physics effects of photovoltaic,pyroelectric and thermal expansion of photostrictive materials.Available experimental data and analytical solutions have been used to verify the present finite element results.The simulation in this study demonstrates that the present formulation is very reliable,accurate and also computationally efficient and that the use of photostrictive actuators can provide good controllability of structural vibration. 展开更多
关键词 photostrictive actuators finite element wireless structural vibration control
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