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Haar wavelet discretization method for free vibration study of laminated composite beam under generalized boundary conditions

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Journal of Ocean Engineering and Science 2021年第1期6卷 1-11页

作者： Sung-Ryol So Hoyong Yun yongho ri Ryongsik O Yong-Il Yun Institute of Advanced Science Kim Il Sung UniversityPyongyangDemocratic People’s Republic of Korea Institute of Science Kimchaek University of TechnologyPyongyangDemocratic People’s Republic of Korea Department of Engineering Machine Pyongyang University of Mechanical EngineeringPyongyangDemocratic People’s Republic of Korea Department of Transport Mechanical Engineering Pyongyang University of Mechanical EngineeringPyongyangDemocratic People’s Republic of Korea

Investigation on vibration of laminated composite beam(LCB)is an important issue owing to its wide use as fundamental *** the present work,we study the free vibration of arbitrarily LCB with generalized elastic boundary condition(BC)by using Haar wavelet discretization method(HWDM).Timoshenko beam theory is utilized to model the free vibration of *** LCB is first split into several segments,and then the displacement for each segment is obtained from the Haar wavelet series and their ***’s principle is applied to construct governing equations and the artificial spring boundary technique is adopted to obtain the general elastic boundary and continuity conditions at two ends of *** vibration characteristics of beam with different fiber orientations and lamina numbers is investigated and its displacements are compared with those in previous *** results are shown graphically and demonstrate the validation of our method.

关键词： Laminated beam Haar wavelet discretization method Elastic boundary condition Free vibration Artificial spring boundary technique

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Effect of rheo-diecast process on the mechanical properties of A390 alloy by serpentine channel

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International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1177-1186页

作者： Kunhyok ri Wei-min Mao Zhi-kai Zheng Myongsik Kim yongho Sin School of Materials Science and Engineering University of Science and Technology Beijing School of Material Engineering Pyongyang Machinery University

In this paper, the effects of rheo-diecast process parameters and T6 heat treatment on the microstructure and mechanical properties of the rheo-diecasting（RDC） semi-solid A390 alloy prepared through pure copper serpentine channel were investigated. The results indicate that the mechanical properties of the RDC samples change with the pouring temperature and injection pressure. In this case, a lower pouring temperature results in better tensile strength and elongation of the RDC A390 alloy; however, the tensile strength and elongation decrease when the pouring temperature decreases to 660°C. Higher injection pressures result in the improved mechanical properties of the RDC A390 alloy. To some extent, T6 heat treatment improves the tensile strength and ductility of the RDC A390 alloy compared to those of the non-heat treated alloy. However, when the pouring temperature and injection pressure are greater than 670°C and 70 MPa, respectively, the mechanical properties are sharply diminished.

关键词： aluminum alloys diecasting rheo-casting microstructure mechanical properties

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