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Large Thrust trans-scale Precision Positioning Stage Based on Inertial Stick-Slip Driving

transactions of Nanjing University of Aeronautics and Astronautics 2015年第2期32卷 204-209页

作者：李宗伟钟博文王振华金子祺孙立宁陈林森 College of Mechanical and Electrical Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou Industry Park Postdoctor Station SVG Digitoptics Co.Ltd

For the smaller thrust,it is difficult to achieve 3Dtrans-scale precision positioning based on previous stick-slip driving.A large thrust trans-scale precision positioning stage is studied based on the inertial stick-slip *** process of the movement is divided into two steps,i.e.,the″sliding″phase and the″stickness″*** the whole process,the kinematics model of the inertial stick-slip driving is established,and it reveals some factors affecting the velocity of inertial stick-slip ***,a simulation of movement is preformed by Matlab-Simulink software,and the whole process of the inertial stick-slip driving is *** one experimental prototype is designed,the back and forth velocity is ***,the simulation verifies the accuracy of the kinematics model.

关键词： PZT actuator inertial stick-slip driving trans-scale precision positioning

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Fundamental strengthening mechanisms of ordered gradient nanotwinned metals

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Nano Research 2023年第11期16卷 12430-12437页

作者： Zhao Cheng Lei Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Ordered structures with functional units offer the potential for enhanced performance in metallic *** these structures,gradient nanotwinned(GNT)microstructures demonstrate excellent *** paper provides a comprehensive review of the current state-of-the-art studies on GNT structures,encompassing various aspects such as design strategies,mechanical properties characterization,spatially gradient strain evolution analysis,and the significant role of geometrically necessary dislocations(GNDs).The primary objective is to systematically unravel the fundamental strengthening mechanisms by gaining an in-depth understanding of the deformation behavior of nanotwinned *** this work,we aim to contribute to the broader field of materials science by consolidating knowledge and providing insights for the development of novel metallic materials with enhanced properties and tailored performance characteristics.

关键词： metallic material ordered design nanotwin units trans-scale strengthening mechanisms

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Scatter of fatigue data owing to material microscopic effects

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Science China(Physics,Mechanics & Astronomy) 2014年第1期57卷 90-97页

作者： TANG XueSong Department of Mechanics School of Civil Engineering and Architecture Changsha University of Science and Technology

A common phenomenon of fatigue test data reported in the open literature such as S-N curves exhibits the scatter of points for a group of same specimens under the same loading *** reason is well known that the microstructure is different from specimen to specimen even in the same ***,a fatigue failure process is a multi-scale problem so that a fatigue failure model should have the ability to take the microscopic effect into account.A physically-based trans-scale crack model is established and the analytical solution is obtained by coupling the micro-and *** is the trans-scale stress intensity factor as well as the trans-scale strain energy density(SED)*** taking this trans-scale SEDF as a key controlling parameter for the fatigue crack propagation from micro-to macro-scale,a trans-scale fatigue crack growth model is proposed in this work which can reflect the microscopic effect and scale transition in a fatigue *** fatigue test data of aluminum alloy LY12 plate specimens is chosen to check the *** S-N experimental curves for cyclic stress ratio R=0.02 and R=0.6 are *** scattering test data points and two S-N curves for both R=0.02 and R=0.6 are exactly re-produced by application of the proposed *** is demonstrated that the proposed model is able to reflect the multiscaling effect in a fatigue *** result also shows that the microscopic effect has a pronounced influence on the fatigue life of specimens.

关键词： fracture mechanics fatigue crack growth multiscaling effect S-N curve microscopic effect trans-scale

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