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RISS 인기검색어
- 검색키워드
- 저자 : Hongyuan Fang (검색결과 3 건)
- 무료
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Critical Velocities for High Speed Particle Deposition in Kinetic Spraying
Wu, Jingwei,Fang, Hongyuan,Yoon, Sanghoon,Lee, Changhee,Kim, HyungJun The Japan Institute of Metals 2006 Materials transactions Vol.47 No.7
<P>During kinetic spraying (or cold gas dynamic spraying), small solid particle can be deposited onto the substrate by a supersonic velocity impaction. A critical velocity of flying particle was found for the minimum deposition speed. Generally, it was thought that higher impact velocity caused higher deposition efficiency. However, some different phenomena were observed during spraying processing in laboratory.In this study, individual particle impact tests have been carried out to probe the effect of impact velocity. Instead of deposition efficiency (DE) of coatings, ratio of bonds, which was defined as the number fraction of attached particles to total impact particles (Craters + Bonds) in unit area of impact surface, was measured in our test. A maximum velocity for particle deposition was observed, because of which a high fraction of rebounded particles occurred at a high impact velocity. A model considering the adhesion and rebound energy was built up to estimate the particle/substrate interaction. The particle deposition behavior was a result of the competition between adhesion and rebound energies during the impact process. Only when the adhesion energy was higher than the rebound energy, the impacting particles could be attached onto the substrate.</P>
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Bending and free vibration analysis of laminated piezoelectric composite plates
Pengchong Zhang,Chengzhi Qi,Hongyuan Fang,Xu Sun 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.6
This paper provides a semi-analytical approach to investigate the variations of 3D displacement components, electric potential, stresses, electric displacements and transverse vibration frequencies in laminated piezoelectric composite plates based on the scaled boundary finite element method (SBFEM) and the precise integration algorithm (PIA). The proposed approach can analyze the static and dynamic responses of multilayered piezoelectric plates with any number of laminae, various geometrical shapes, boundary conditions, thickness-to-length ratios and stacking sequences. Only a longitudinal surface of the plate is discretized into 2D elements, which helps to improve the computational efficiency. Comparing with plate theories and other numerical methods, only three displacement components and the electric potential are set as the basic unknown variables and can be represented analytically through the transverse direction. The whole derivation is built upon the three dimensional key equations of elasticity for the piezoelectric materials and no assumptions on the plate kinematics have been taken. By virtue of the equilibrium equations, the constitutive relations and the introduced set of scaled boundary coordinates, three-dimensional governing partial differential equations are converted into the second order ordinary differential matrix equation. Furthermore, aided by the introduced internal nodal force, a first order ordinary differential equation is obtained with its general solution in the form of a matrix exponent. To further improve the accuracy of the matrix exponent in the SBFEM, the PIA is employed to make sure any desired accuracy of the mechanical and electric variables. By virtue of the kinetic energy technique, the global mass matrix of the composite plates constituted by piezoelectric laminae is constructed for the first time based on the SBFEM. Finally, comparisons with the exact solutions and available results are made to confirm the accuracy and effectiveness of the developed methodology. What’s more, the effect of boundary conditions, thickness-to-length ratios and stacking sequences of laminae on the distributions of natural frequencies, mechanical and electric fields in laminated piezoelectric composite plates is evaluated.
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NONDESTRUCTIVE MEASUREMENT SYSTEM FOR WELDING RESDIUAL STRESS BY ULTRASONIC METHOD
ZHANG Shiping,LI Ying,SUN Jinwei,FANG Hongyuan 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Residual stresses are one of the most important challenges to the safety of parts and structures. Considering the disadvantages of the traditional measurement of residual stress which are time-consuming, consumption, destruction, huge volume??Ultrasonic stress measurement installation is improved to meet the measurement of thin wall welded structure. The acoustical theory is introduced. Ultrasonic stress measurement experimental installation is designed. The longitudinal residual stress and transverse residual stress of twin wire welded plate are measured by the proposed system. The result of the ultrasonic method is verified by laser hologram interference hole-drilling method and finite element method. The measurement process by Ultrasonic method is not only nondestructive, but also real-time.
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