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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Zhang, Qingling Jin, Miao Guo, Baofeng Li, Qun School of Mechanical Engineering Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao066004 China

ISBN: (纸本)9783030753801

The cyclic softening/hardening, ratcheting effect, and Bauschinger effect usually occur in the body structure of large mechanical equipment under cyclic loading. This manuscript focuses on Q235 steel commonly used in the welded frame of large mechanical equipment. The experiments were carried out with mean stress varying from −60 to 60 MPa and stress amplitude varying from 300 to 340 MPa, respectively, and the mechanical responses were analyzed comprehensively. The experimental results show that Q235 steel exhibits cyclic softening characteristics at positive mean stress and cyclic hardening characteristics at negative mean stress. The larger the stress amplitude or the absolute value of the mean stress, the greater the absolute value of ratcheting strain. At the same stress amplitude, when the absolute value of the mean stress is equal, the Bauschinger coefficient is almost equal. Based on the experimental results, the evolution formula of ratcheting strain is established by a phenomenological method. © 2021, The Minerals, Metals & Materials Society.

关键词： Loading

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Auto-establishing simulation parallel manipulators with linear legs and auto-solving their workspaces by utilizing CAD variation geometry

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International Journal of Computers and Applications 2017年第4期39卷 220-233页

作者： Lu, Yi Bi, Cuicui Ye, Nijia Bo, Hu College of Mechanical Engineering Yanshan University Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of National Education Yanshan University QinhuangdaoHebei China Hebei Hanguang Industry CO. LTD Hebei China

A new approach of CAD variation geometry is proposed for automatically establishing the simulation mechanisms of parallel manipulators (PMs) with linear legs, and automatically solving their forward displacements, workspaces, and Euler angles. First, the basic concepts and techniques of the CAD variation geometry are described. Second, a program is developed by utilizing new approach. In the developed software, an interface is constructed for inputting given parameters and outputting solved results of data and graphs, several sub-programs are compiled for automatically establishing various simulation mechanisms, solving the forward displacements, and solving/ displaying reachable workspaces and Euler angles of various PMs. Third, the three novel and five existing different PMs are illustrated. When the given parameters of the PMs into the interface are inputted, their simulation mechanisms are established automatically. The displacements, the reachable workspaces, and the Euler angles are solved automatically. Finally, the solved results of the developed software are verified by that of the analytic solutions of several existing PMs and the simulation solutions of several novel PMs. © 2017 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Geometry

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Design and Analysis of a Novel Ring Truss Deployable Antenna Mechanism 16th

Design and Analysis of a Novel Ring Truss Deployable Antenna...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Han, Bo Yuan, Zhantu Zhou, Yuanzhi Liu, Feng Yao, Jiantao Zhao, Yongsheng Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao066004 China

ISBN: (纸本)9789819965038

With the development of astronautics, satellite antenna as an important communication equipment has also gradually developed to large scale. In this paper, a novel ring truss deployable antenna mechanism is proposed. The mechanism has three layers of installation points with height differences between them, which can be used to ensure that all the installation points will be distributed on the profile of the cable network, and this characteristic ensures the mechanism can be utilized to the maximum. Then the degrees of freedom (DOF) and kinematics of the ring truss deployable mechanism are analyzed using screw theory, where the analysis shows that the DOF of the overall ring truss deployable mechanism is equal to one. Following that, the dynamics model about the mechanism unit is established using the second type of Lagrange equations. Based on this dynamic model, the effect of torsion spring stiffness on the deployment process is discussed and the conclusion is verified by simulation. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Trusses

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Processing and simulation of thin-walled shell with inner ribs formed by inner spinning technology

Processing and simulation of thin-walled shell with inner ri...

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International Conference on Industrial, Mechanical and Manufacturing science, ICIMMS 2014

作者： Wang, Zhenjie Guo, Baofeng Ma, Shicheng Education Ministry Key Laboratory of Advanced Forging and Stamping Science and Technology College of Mechanical Engineering Yanshan University QinhuangdaoHebei China Special Material and Technic Institution of Aerospace Beijing China

ISBN: (纸本)9781138026568

The formation of a thin-walled shell structure with inner ribs by inner spinning technology was simulated using the finite element simulation softwareABAQUS. The spinning force and deformation condition were calculated and analyzed in this simulation. Results indicate that a thin-walled cylindrical shell with uniform deformation can be obtained using the inner spinning process with good forming effect. For all the regions, the radial load was found to be greater than the axial load, with the radial load in the range of 0–270 kN. The skin and the back frame sections experience load peaks, which is in the expansion capacity of −200mm for the skin section. The peak load in the rear frame section is stable in a 15mm stroke, which then gradually decreases to zero. The forming load in the front frame increases with the increase in the feed load of the spinning wheel, leading to the possibility of fracture in this region. The axial spinning load is rather small in the range of 0–47 kN. Based on the simulated values of these parameters, we demonstrated the formation of good quality 2A12 aluminum alloy products using the inner spinning technology. © 2015 Taylor & Francis Group, London.

关键词： Deformation

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Comparative study on forming limit prediction of AA7075-T6 sheet with M−K model and Lou−Huh criterion

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1463-1477页

作者： Guo-jiang DONG Zhi-wei CHEN Zhuo-yun YANG Bo-cheng FAN Hebei Key Laboratory of Special Delivery Equipment Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education of China Yanshan UniversityQinhuangdao 066004China

In order to effectively predict the fracture of AA7075-T6 sheet, the forming limit curves of AA7075-T6 high-strength sheet were drawn according to Morciniak Kuczyski (M K) model and Lou Huh criterion, respectively. The errors between the predicted values of the two theoretical prediction models and experimental values were calculated by error analysis. The forming limit curves were verified by the punch stretch test to evaluate the prediction accuracy of M K model and Lou Huh criterion. The error analysis results show that the mean error of Lou Huh criterion with the optimal parameters for all tensile specimens is 25.04%, while the mean error of M K model for all tensile specimens is 74.24%. The prediction accuracy of Lou Huh criterion in predicting the fracture of AA7075-T6 sheet is higher. The punch stretch test results show that the forming limit curve drawn by Lou Huh criterion can effectively predict the fracture of AA7075-T6 sheet, but the prediction accuracy of M K model is relatively poor.

关键词： ductile fracture criterion M K model forming limit diagram AA7075-T6 sheet

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Design and experimental study of the remote control for a novel patient transfer apparatus 5

Design and experimental study of the remote control for a no...

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2020 5th International Seminar on Computer technology, Mechanical and Electrical Engineering, ISCME 2020

作者： Tian, Yu Wang, Hongbo Zhang, Yongshun Tian, Junjie Du, Jiazheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao Hebei China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao Hebei China

This paper introduces the design of the remote control for a novel patient transfer apparatus. First, the overall design of the control system is put forward based on the working principle, and design requirements of the apparatus. Second, voltage regulator circuit of the remote control based on the MC34063 is designed to fit for the OLED displayer, parameters such as the filter capacitor have been determined. Next, wireless communication unit adopted CC1110 and the communication instruction code is introduced. Then, the interaction interface of the remote control is finished to facilitate the implementation of the adjustment functions. finally, a simulation and a real experiment has been completed, it indicates the correctness of the voltage regulator circuit and the effectiveness of the remote control respectively. © Published under licence by IOP Publishing Ltd.

关键词： Remote control

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Multi-point flexible straightening process by reciprocating bending for metal profiles

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Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2039-2050页

作者： Xue-ying HUANG Jun ZHAO Gao-chao YU Qing-dang MENG Zhen-kai MU Yan-jun LIU Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

A multi-point flexible straightening process characterized by reciprocating bending is ***,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical experiments of the straightening of a series of metal profiles with different materials and initial ***,the relationship between the bending radius and the times of reciprocating bending required to unify the curvature is discussed,and the distribution of residual stress after straightening is *** results show that the reciprocating bending process can eliminate the difference of the initial curvature,make the curvature of each section tend to be uniform;the times of reciprocating bending to reach the uniform curvature decreases with the decrease of bending *** straightness of the straightened profile obtained from the experiment and simulation is less than 0.2%,demonstrating a good feasibility of this method.

关键词： multi-point flexibility metal profile reciprocating bending curvature unification over-bending straightening straightness

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Microstructure,mechanical properties and multiphase synergistic strengthening mechanisms of a novel laser additive manufactured AlNi6TiZr alloy

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Journal of Materials science & technology 2024年第11期178卷 59-69页

作者： Jiang Bi Liukun Wu Zeqi Liu Haixiang Wang Shide Li Ji Wang Zhuoyun Yang Nannan Lu Xi Chen Mikhail Dmitrievich Starostenkov Guojiang Dong Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China CITIC Dicastal Co. Ltd.Qinhuangdao 066004China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China General Physics Department Altai State Technical UniversityLeninist.46Barnaul 656099Russia

In this work,selective laser melting(SLM)process is used to prepare the AlNi6TiZr *** analyzing the printing quality and mechanical properties of the printed specimens with different process parameters,the SLM forming window of AlNi6TiZr is *** relative density of the sample printed with 270 W-1100 mm/s(laser energy density:82 J/mm3)reaches 99.7%,exhibiting excellent mechanical properties(yield strength(YS):421.7 MPa;ultimate tensile strength(UTS):480.4 MPa).After an aging treatment of 325 ℃-12 h,the YS and UTS of the sample increased to 494 MPa and 550.7 MPa,*** Ni,Ti,and Zr components promoted the generation of multi-phase precipitates in the Al alloy and improved the synergistic strengthening effect of *** hard-shell structure(HSS)formed by the Al_(3)Ni phase at the grain boundary significantly strengthened the grain boundary *** precipitated Al_(3)(Ti,Zr)phases at the grain boundaries prevent grain growth and dislocation *** Al_(3)Ni and Al_(3)(Ti,Zr)phases have good thermal stability that can still maintain excellent enhancement effects at high ***6TiZr alloy has great application prospects in medium and high-temperature environments.

关键词： Selective laser melting Al6NiTiZr alloy Microstructure Mechanical properties Thermal stability Strengthening mechanism

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High temperature stress–strain curves of MnS and their applications in finite element simulation

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Transactions of Nonferrous Metals Society of China 2018年第10期28卷 2082-2093页

作者： Miao JIN Lin-lin YU Xin-gang LIU Bao-feng GUO Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

A novel method for testing stress–strain curves of non-metallic materials was *** high temperature stress-strain curves of MnS were preliminarily obtained and corrected to account for the influence of *** the finite element method,the influence of deformation parameters on the deformation evolution of MnS inclusions was investigated based on the experimental reference *** corresponding physical experiment was designed for comparative *** results indicate that the experimental high-temperature deformation data of MnS are highly *** the process of matrix deformation,the shapes of MnS inclusions change from spherical to ellipsoidal and even to *** are some differences in the morphological deformation of MnS inclusions located at different *** the increase in the initial size of MnS inclusions,the risk of failing the inclusion-flaw inspection increases and the forging quality further deteriorates.

关键词： inclusion MnS stress-strain curve finite element method morphology

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Kinematics Analysis of a New Parallel Mechanism with Complete Separation of Constraints and Drives 16th

Kinematics Analysis of a New Parallel Mechanism with Complet...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Qiu, Can Wang, Yu Wu, Jiabin He, Xiaoyu Ma, Xuejian Xu, Yundou Zhao, Yongsheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao066004 China

ISBN: (纸本)9789819964888

At present, there is a growing demand for parallel mechanisms with fewer inputs and more outputs. These mechanisms are highly sought after in industries such as aerospace, antenna, and entertainment facilities, among others. Therefore, this paper proposes a new parallel mechanism (PM) that utilizes separation of constraints and drives, resulting in centralized drive management. Thereby achieving a small amount of driving to drive multiple parallel moving platforms. For example, 3nRRS/PPPS parallel mechanism. In this study, we utilize the closed-loop vector method to obtain the inverse solution for the 3RRS/PPPS parallel mechanism. To perform a static analysis, we construct a complete Jacobian matrix for the mechanism. Under the premise of satisfying the workspace, the key dimensional parameters of the mechanism were optimized with the objective of improving the load-carrying capacity of the mechanism and minimizing the driving force. The method of complete separation of constraints and drives is easier to centrally manage drives, greatly improving energy utilization and work efficiency, and having a wide range of application scenarios in antenna, entertainment facilities, and other situations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Inverse problems

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