Prof. Ji Wang, Ningbo University, China
Title: A Quantitative Characterization and Assessment of Surface Roughness of Components from the Measurement of Wave Velocities
Abstracts:The surface of materials of commonly used components of various functions is processed with many technologies and subjected to change under the attack of many factors in service such as corrosion, friction, and impact. With safety and reliability concerns, it is always beneficial to have the surface and immediate vicinity characterized with the use of mechanical properties and other factors such as bonding rigidity and surface roughness. Among many techniques for the measurement and assessment, methods based on nondestructive testing technology such as acoustic waves are always preferred for the advantages such as in-situ, fast, and noncontact features. To improve such measurement, we consider a component with a rougher surface for the acoustic wave properties about changes in material properties. By calculating the velocity of surface acoustic waves with the consideration of material properties and surface roughness, more accurate properties of the surface layer are obtained to enable accurate estimation as part of the characterization and assessment procedure. Further improvement will be the consideration of the grading materials. It is believed such analysis will lead to possible novel approaches for the assessment of the surface of components of various functions. Such a method can be used for the measurement of the visible and nonvisible material surface with known properties for an enhanced assessment of the component to satisfy engineering applications’ needs
Experience: Professor Wang has been working on acoustic waves and high-frequency vibrations of elastic and piezoelectric solids for resonator design and analysis with several US and Chinese patents, over 200 journal papers, and frequent invited, keynote, and plenary presentations at major conferences around the world. He has been a board member, advisor, and consultant to many leading companies in the acoustic wave device industry. Professor Wang has been a member of many international conference committees and currently serving the IEEE UFFC Technical Program Committees of the Frequency Control and Ultrasonics Symposia, the IEEE MTT-S, and the IEC TC-49. He is also the founding chair of the Committee on Mechanics of Electronic and Magnetic Devices, CSTAM, and the SPAWDA. Profess Wang was the editor-in-chief of Structural Longevity and a member of editorial boards of several international journals
Prof. Kun Li,Chongqing University,China
Title: Additive manufacturing and intelligent processing control of advanced metal materials
Abstracts: As an important branch in the field of 3D printing, metals additive manufacturing, has demonstrated great value and broad application in strategic emerging industries such as aerospace like turbo engine and blades, transportation like bearings, new energy and medical structures. The research progress has been made through several decades combined with the lab research. It has changed the traditional manufacturing methods and provided new ideas for the direct manufacturing of complex metal structures and functional parts, liberating the freedom of designers and making new product forms emerge, which shows very considerable prospects in the fields of innovative product development, biomedicine and energy.
Experience: Distinguished Professor of "Hongshen Young Scholars", PhD supervisor, overseas talents. Obtained Bachelor degree from Jilin University, obtained Philosophy degree from Tsinghua University. In February 2017, he went to the University of Texas at El Paso for postdoctoral research and served as Prof. Lawrence E. Murr (The pioneer in additive manufacturing in the US) and R.D.K. Misra's PhD student co-supervisor. The scientific research achievements won the University of Texas Researcher Award 2018. In April 2019, he served as a senior researcher in the Department of Mechanical Engineering and Materials Science, University of Pittsburgh. In August 2020, he was hired as a "Hongshen Young Scholar" Distinguished professor and doctoral supervisor of Chongqing University, engaged in teaching and research work. Mainly engaged on additive manufacturing, intelligent 3D net forming, high-performance materials and phase change, and material computing. He has published more than 40 papers in famous journals and conferences such as "Additive Manufacturing", "Journal of Materials Science and Technology", "Materials Science and Engineering: A", and "Journal of Nuclear Materials". Served as the reviewer of famous journals in the fields of "Acta Materialia", "Materials Research Letters", "International Journal of Plasticity" and other fields.
Prof. Yumin Cheng,Shanghai University,China
Title: The Improved Element-Free Galerkin Method Using the Interpolating Functions for Swelling Problems of Polymer Gels
Abstracts: In this paper, the interpolating moving least-squares (IMLS) method based on a nonsingular weight function is used to construct the approximation function, the weak form of the problem of inhomogeneous swelling of polymer gels is used to obtain the final discretized equations, and penalty method is applied to impose the displacement boundary condition, then an improved element-free Galerkin (IEFG) method for the problem of the inhomogeneous swelling of polymer gels is presented. Some examples of inhomogeneous swelling of polymer gels solved with the IEFG method in this paper are given. The accuracy of the numerical solutions of the IEFG method are discussed by using different weight functions, penalty factor, scale parameter of influence domain, node distribution and step number. Numerical results of the IEFG method for inhomogeneous swelling of polymer gels show that this method has great precision, and it can solve large deformation problems of polymer gels effectively.
Experience: Dr. Yumin Cheng is Professor of Shanghai Institute of Applied Mathematics and Mechanics and Shanghai University. He has published more than 250 papers with more than 5300 citations. His h-index in scopus.com is 47. He has been honored with Fellow of The International Association of Applied Mechanics (IAAM), Fellow of International Association of Advanced materials and VEBLEO Fellow awards. He is an Executive Committee member of IAAM and Chairman of Committee of IAAM Standards and Codes. He has been Lead Guest Editor of the Special Issues of Mathematics, Mathematical Problems in Engineering and CMES-Computer Modeling in Engineering & Sciences, and he is Associate Editor of the International Journal of Computers, Editor and Member of the Editorial Board of the International Journal of Applied Mechanics, and Member of the Editorial Board of Mathematics, International Journal of Computational Materials Science and Engineering, Journal of Computational Engineering, International Journal of Applied & Experimental Mathematics, and International Journal of Mathematical Physics and Video Proceedings of Advanced Materials.
Assoc. Prof. Cunxian Wang,Northwestern Polytechnical University,China
Title: On dynamic behavior of high lock bolted joints: testing, analysis and predicting
Abstracts: A bidirectional synchronous dynamic loading technique based on electromagnetic split Hopkinson tensile bar (ESHTB) system was employed to investigate the dynamic behavior and failure of high lock bolted joints. Force-displacement curves over wide ranges of loading speed (5×10−6 m/s to 15 m/s) and loading state (tension, shear and three kinds of tension-shear coupling) were obtained by combining with results obtained from quasi-static tests. An obvious elevation of failure load levels when changing the loading state from shear to tension or improving the loading speed was observed. Meanwhile, such strengthening effect of loading state on failure loads presented positive correlation with the loading speed. Detailed analysis for effect of loading state on mechanical behavior of bolted joints was conducted by applying von Mises yield criterion together with failure load analysis. Moreover, on this base, the influence of loading speed on failure loads was reasonably defined by applying a relation equal to the different strain rate effect between shear and tension for bolt material. Finally, a failure criterion considering coupling effect of loading speed and loading state on failure load of bolted joint was proposed. Prediction results showed a good agreement with the experimental results, indicating the determination of failure loads for bolted joints under different loading states over a wide range of loading speeds can be achieved.
Experience: Mainly engaged in the research work of mechanical behavior test and analysis of aviation materials and structures under impact load, with the main research direction of structural impact response and failure. The main scientific research achievements include dynamic mechanics and failure behavior of aviation rivet/bolt connection structures, high-speed impact response of composite structures, dynamic constitutive model of metal materials and failure parameter acquisition methods, etc., which provide much-needed testing and research means for dynamic impact test and numerical simulation in the fields of national defense and civil aviation.
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