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Forming mechanism of ultrasonic vibration assisted compression

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Transactions of Nonferrous Metals Society of China 2015年第7期25卷 2352-2360页

作者：庄新村王家鹏郑欢赵震上海交通大学材料科学与工程学院塑性成形技术与装备研究院上海200030

To study the mechanism of ultrasonic vibration assisted forming,the static and vibration assisted compression tests of aluminum 1050 were carried out via a 25 kHz high-frequency ultrasonic vibration *** is found that vibration reduces the flow resistance and improves the surface *** force reduction level is proportional to the ultrasonic vibration *** using numerical simulation of static and vibration assisted compression tests,the deformation characteristics of material were *** the vibration,the friction between the materials and tools *** stress superposition and friction effects are found to be two major reasons for reducing the ***,the force reduction because of stress superposition and friction effects is still less than the actual force reduction from the tests,which suggests that softening effect may be one of the other reasons to reduce the force.

关键词： ultrasonic vibration compression stress superposition friction effect

Effects of ultrasonic vibration on solidification structure and properties of Mg-8Li-3Al alloy

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1241-1246页

作者：姚磊郝海季首华房灿峰张兴国大连理工大学材料科学与工程学院大连116024

ultrasonic vibration was introduced into the Mg-8Li-3A1 alloy melt during its solidification process. The microstructure, corrosion resistance and mechanical properties of the Mg-8Li-3A1 alloy under ultrasonic vibration were investigated. The experiment results show that the morphology of a phase is modified from coarse rosette-like structure to fine globular one with the application of ultrasonic vibration. The fine globular structure is obtained especially when the power is 170 W, and the refining effect also gets better with prolonging the ultrasonic treatment time. The corrosion resistance of the alloy with 170 W of ultrasonic vibration for 90 s is improved apparently compared with the alloy without ultrasonic vibration. The mechanical properties of alloys with ultrasonic vibration are also both improved apparently. The tensile strength and elongation of alloy improve by 9.5% and 45.7%, respectively, with 170 W of ultrasonic treatment for 90 s.

关键词： Mg-8Li-3A1 alloy ultrasonic vibration corrosion resistance

Design and Research of a New Type of ultrasonic vibration De-Gluing Device

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World Journal of Engineering and Technology 2021年第4期9卷 891-903页

作者： Zihao Liu Zhen Yin Jie Ying Peng Zhang College of Mechanical Engineering Suzhou University of Science and Technology Suzhou China

In this paper, a new type of ultrasonic vibration de-gluing device has been designed to remove the cured epoxy resin adhesive that overflowed from the aluminum alloy structural parts in the high-speed train carriages. At present, manual removal is used to remove the cured epoxy resin adhesive that overflows at the bonding site. This method has low removal efficiency and leads to poor surface quality of the parts. The new type of ultrasonic vibration de-gluing device can solve these problems. Modal analysis and harmonic response analysis are carried out on the ultrasonic vibration oscillator system in the ultrasonic vibration de-gluing device, and the reasonable structure parameters and resonance frequency of the ultrasonic vibration oscillator system are determined. Finally, the impedance test and de-gluing effect test are carried out on the prototype of the ultrasonic vibration de-gluing device to verify the feasibility and practicability of the new type of ultrasonic vibration de-gluing device. The results show that the ultrasonic vibration de-gluing device’s stable resonant operating frequency is 28,270 Hz, and the average error between the simulation and experimental results of the resonant operating frequency is less than 3%, which validates the simulation model.

关键词： ultrasonic vibration Epoxy Resin Adhesive Finite Element Analysis ultrasonic De-Gluing

Experimental Investigation on Finishing Technology by Magnetostrictive ultrasonic vibration of Magnetic Liquid

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Defence Technology（防务技术） 2010年第3期6卷 166-170页

作者：陈善飞顾邦明王正才王正良 Zhejiang Wanli University Ningbo Polytechnic

Magnetic liquid can produce alternative internal pressure under the alternative high-frequency gradient magnetic *** it has higher bulk modulus,the internal pressure results in its volume *** piezoelectric transducers,the ultrasonic wave generated by the vibration of magnetic liquids can be detected,which shows that the magnetic liquids have the magnetostrictive effect and can generate the ultrasonic vibration under the alternative magnetic gradient *** nonmagnetic abrasives and rust-proofing agents can be mixed into the magnetic liquids,under the alternative magnetic field,the abrasives held by magnetic liquids grind the surface of the workpieces,and thus,the finishing for the surface with complex shape,mold cavity and inner wall of tiny tubes can be realized.

关键词： materials synthesis and processing technology finishing magnetic liquid magnetostrictive ultrasonic vibration

Effects of ultrasonic vibration and Electromagnetic Stirring on the Dispersion of TiB2 Particles for AZ31Magnesium Alloy

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Effects of Ultrasonic Vibration and Electromagnetic Stirring...

第七届冶金与材料电磁过程国际会议（EPM2012）

作者： FANG Can-feng WANG Lao-hu MENG Ling-gang HAO Hai ZHANG Ai-min ZHANG Xing-guo School of Materials Science and Engineering.Dalian University of Technology

In-situ TiB/AZ31 composites were prepared by utilizing the SHS reaction of Al-Ti-B system in the molten magnesium,and the effects of external physical fields on the dispersion of TiB particles were *** results show that high-energy ultrasonic vibration could effectively break up the particle clusters and make the TiB particles uniformly distributed in the melt of TiB/AZ31 *** compound field(high-energy ultrasonic field coupling with electromagnetic field) could not only distribute the TiB particles into the matrix uniformly,but also make the grains of α-Mg fine and uniform further than the ultrasonic field *** average grain size of as-cast TiB/AZ31 composites was reduced from 173 μm to 94 μm.

关键词： TiB2/AZ31 magnesium matrix composites ultrasonic vibration electromagnetic field compound field

Piezo-Powered Micro-Dissection System with ultrasonic vibration

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Piezo-Powered Micro-Dissection System with Ultrasonic Vibrat...

第三十届中国控制会议

作者： CHEN Liguo~1,LIU Yaxin~2,SUN Lining~1 1.Robotics and Microsystems Center,Soochow University,Suzhou 215021,P.R.China 2.State Key Laboratory of Robotics and System,Harbin Institute of Technology,Harbin 150001,P.R.China

＜正＞in biomedical areas,Micro-dissection technology plays an important role for Cancer Genomics,through which pure population of targeted cells can be procured from tissue sections for subsequent *** this paper,a novel Piezo-powered Micro-dissection system using ultrasonic vibration was ***,the Piezo-powered Micro-dissection principle and system construction will be introduced *** the key component of the system,piezo-powered micro-dissection tool,is proposed in *** micro-dissection tool could vibrate with the frequency scope from 0.5k to40K and the amplitude scope from 0 to 2μ***,a variety of experiments about bio-micro-dissection on liver tissue slice were carried out,and the experiments show the feasibility of the micro-dissection method with ultrasonic *** new micro-dissection method can be adopted in the bio-micro-manipulation field and it can also significantly promote the development of Biomedical Engineering.

关键词： Micro-dissection ultrasonic vibration Piezo-powered

INVESTIGATION AND SIMULATION OF ultrasonic vibration ELECTRICAL DISCHARGE MILLING IN GAS

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INVESTIGATION AND SIMULATION OF ULTRASONIC VIBRATION ELECTRI...

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： SU Shupeng, ZHANG Qinhe*, ZHANG Qibu, ZHANG Jianhua School of Mechanical Engineering, Shandong University, Jingshi Road 73, Jinan 250061, China

ultrasonic vibration Electrical Discharge Machining (UEDM) in gas, an evolution of EDM in gas, is well established for producing complex 3D shaped cavities efficiently and shows great potential for ap

关键词： EDM gas medium ultrasonic vibration milling NN.

Improving the stability and performance of Sn-based perovskite solar cells by ultrasonic substrate vibration post treatment

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Improving the stability and performance of Sn-based perovski...

第五届新型太阳能电池学术研讨会

作者： Yihe Miao Morteza Eslamian University of Michigan-Shanghai Jiao Tong University Joint Institute

Lead halide perovskite solar cells(PSCs) show highly competitive power conversion efficiency among new generation solar cells. However, there is a concern about their environmental toxicity, which may hamper their practical utilization. As an alternative,less-toxic tin(Sn)-based PSCs have been proposed as a substitute for the Pb-based ***, pure Sn-based PSCs suffer from extreme instability and poor reproducibility, due to heterogeneous Sn perovskite layer, and the easy oxidation of Sn to ***, we propose to utilize ultrasonic substrate vibration post treatment(SVPT) imposed on the wet film of the perovskite layer, to improve the performance and stability of the Sn-based perovskite active layer. The SVPT has worked well on Pb-based *** ongoing results show that the SVPT method contributes to obtaining highly oriented and homogenous growing FASnI grains(Fig. 1), resulting from reduced number of grain boundaries and suppressed tin *** addition, we observed that the SVPT results in improved absorbance of the perovskite layer.

关键词： Sn-based perovskite solar cells lead-free perovskite solar cells ultrasonic vibration

Comparative analysis of single-crater parameters in ultrasonic-assisted and unassisted micro-EDM of Ti6Al4V using discharge plasma imaging

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Nanotechnology and Precision Engineering 2024年第2期7卷 11-24页

作者： Sohaib Raza Chandrakant Nirala Department of Mechanical Engineering Indian Institute of Technology RoparPunjab 140001India

ultrasonic-assisted micro-electro-discharge machining(EDM)has the potential to enhance processing responses such as material removal rate(MRR)and surface *** understand the reasons for this enhancement,the physical mechanisms responsible for the individual discharges and the craters that they form need to be *** work examines features of craters formed by single discharges at various parameter values in both conventional and ultrasonic-assistedEDM of ***-speed imaging of the plasma channel is performed,and data on the individual discharges are captured in real-time.A 2D axisymmetric model using finite element software is established to model crater *** the basis of simulation and experimental results,a comparative study is then carried out to examine the effects of ultrasonic vibrational assistance on crater *** every set ofEDM parameters,the crater diameter and depth from a single discharge are found to be higher in ultrasonic-assistedEDM than in conventional*** improved crater geometry and the reduced bulge formation at the crater edges are attributed to the increased melt pool velocity and temperature predicted by the model.

关键词： ultrasonic vibration Discharge crater Plasma diameter Single discharge