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

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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Research on the Process-based Generation Method of Scenarios Database for Maritime Autonomous Surface Ship Test 7

Research on the Process-based Generation Method of Scenarios...

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2022 7th International Conference on Electronic technology and Information science, ICETIS 2022

作者： Wang, Xinyu Wang, Yihang Ma, Jilin Bian, Hui Zhao, Xuan Lan, Yaoyao Qinhuangdao Branch China Classification Society Hebei Qinhuangdao China School of Mechanical Engineering Yanshan University Hebei Qinhuangdao China Science and Technology Innovation and Test Center China Classification Society Beijing China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Hebei Qinhuangdao China

ISBN: (纸本)9783800757794

In recent years, Maritime Autonomous Surface Ship (MASS) has been developed rapidly and has demonstrated many new capabilities, which poses a challenge to the testing methods of autonomous ships. Currently, traditional test methods is no longer sufficient to support comprehensive testing and verification. For virtual testing, there is still a lack of a reliable virtual test scenario generation process. Therefore, this paper proposes a method for generating virtual test scenarios for autonomous ships. It is based on the scenario generation frame of the intelligent car and comprehensively considers the feature of the operating environment of the MASS. This process develops an element database by deconstructing the real scenes. For generating, it reconstructs and assigns the elements according to the test task (functional scenario) and the logical relationship between the elements (logical scenario) to reconstruct the new scenario. The new scenarios obtained in this way are optimized and supplemented to be the test scenarios database. In addition, a prototype following this frame was designed and loaded with the "automatic pathfinding task of the Wuhan section of the Yangtze River under good navigation conditions" for testing. The experiment generated 48 different scenarios, proving that this generator can output a comprehensive test scenario database to meet test requirements. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Database systems

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Research on Active Training Model of Rehabilitation Robot Based on Joint Torque Signal 2

Research on Active Training Model of Rehabilitation Robot Ba...

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2nd International Symposium on Application of Materials science and Energy Materials, SAMSE 2018

作者： Wang, Hongbo Yan, Hao Yan, Yonggan Li, Yungui Niu, Baoshan Liu, Meng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University China Academy for Engineering and Technology Fudan University Shanghai China

This paper constructs a man-machine integrated no-load static model considering the self-balancing of the mechanism, obtains the mapping relationship among joint variable, no-load torque, measured torque and end-force of the patient. According to the damping control strategy, the end force and speed mapping function planning is completed. The joint angular velocities based on the kinematic inverse solution are calculated, which are important parameter of man-machine coupling motion. © Published under licence by IOP Publishing Ltd.

关键词： Balancing

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Three-roller continuous setting round process for longitudinally submerged arc welding pipes

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Transactions of Nonferrous Metals Society of China 2021年第5期31卷 1411-1426页

作者： Xue-ying HUANG Jun ZHAO Gao-chao YU Qing-dang MENG Zhen-kai MU Rui-xue ZHAI Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

In order to solve the problems of excess ovality and cross-section distortion of longitudinally submerged arc welding pipes after forming,a new three-roller continuous setting round process was *** process can be divided into three stages:loading stage,roll bending stage and unloading *** on the discretization idea,the mechanical model of the primary statically indeterminate problem of the longitudinally submerged arc welding pipes at the roll bending stage was established,and the deformation response was *** simulation and theoretical results show that there are three positive bending regions and three reverse bending regions along the circumference of the *** loading force of each roller shows growth,stability and downward trend with *** error between the theoretical fitting curve and the simulated data point is very small,and the simulation results verify the reliability of the theoretical *** experimental results show that the residual ovality decreases with the increase of the reduction,and the reduction of the turning point is the optimum *** addition,the residual ovality of the pipe is less than 0.7%without cross-section distortion,which verifies the feasibility of this process.

关键词： longitudinally submerged arc welding pipes three-roller continuous setting round statically indeterminate problem mechanical model ovality optimum reduction

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Study on the Health Condition Monitoring Method of Hydraulic Pump Based on Convolutional Neural Network

Study on the Health Condition Monitoring Method of Hydraulic...

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA

作者： Sun Shaowu Zhang Sheng Jiang Wanlu Li Zhenbao Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Qinhuangdao China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170824

Aiming at the different health states of hydraulic pumps, this paper proposes to use the convolutional neural network to classify and identify the time-frequency images of different volumetric efficiency of hydraulic pumps to realize the health status monitoring of hydraulic pumps. After collecting the vibration signal data of the hydraulic pump, the time-frequency map is formed by short-time Fourier transform, wavelet transform, and Wigner-Will distribution, and then the generated time-frequency map is divided into a training set and a test set, in which the former is used to train the convolutional neural network and the latter is used to verify the recognition result. Finally, it is proved that the convolutional neural network can well identify the different health states of the hydraulic pump, and the recognition rate reaches 99%.

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Cyclic Hardening/Softening of a TRIP Duplex Stainless Steel 13th

Cyclic Hardening/Softening of a TRIP Duplex Stainless Steel

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

作者： Jin, Miao Chen, Lei Zou, Zongyuan Hao, Shuo Li, Qun Zhao, Shiyan Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao066004 China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University Qinhuangdao066004 China

ISBN: (纸本)9783030753801

Recently, a series of duplex stainless steels (DSSs) have been developed by replacing Ni–Mo with Mn–N, which makes DSS more economical and produces TRIP effect with higher strength and plasticity. In this work, the mechanical properties of a TRIP-assisted DSS under monotonic and cyclic loading conditions were studied and the micro-structure under cyclic loading was analyzed by transmission electron microscopy (TEM). The test steel exhibits enhanced mechanical properties and a typical "three-stages" hardening characteristic due to TRIP effect under monotonic loading conditions. Cyclic hardening/softening characteristics of the test steel are affected by strain amplitude and the number of cycles. With smaller strain amplitude, cyclic hardening occurs first, and then shifts to cyclic softening and gradually trends to stabilization. With larger strain amplitude, after initial rapidly cyclic hardening, the test steel still changes to cyclic softening, however, no stabilization occurs until failure. The dislocation walls in ferrite during cyclic deformation are responsible for the overall cyclic softening of the test steel;While austenite produces Ε martensite transformation at larger strain amplitude, which suppresses the cyclic softening, so that with an increase in strain amplitude the cyclic softening rate increases rapidly, followed by a slow increase and a final decrease. © 2021, The Minerals, Metals & Materials Society.

关键词： High resolution transmission electron microscopy

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Effect of stress loading direction on microstructure evolution and age-hardening behavior of a stress-aged Mg-7Sn alloy

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Journal of Alloys and Compounds 2025年 1032卷

作者： Jing Jiang Jishang Ran Lin Tong Guangli Bi Yuandong Li Tijun Chen State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou 730050 China School of Material Science and Engineering Lanzhou University of Technology Lanzhou 730050 China AVIC Shaanxi Hongyuan Aviation Forging Company Ltd. Xianyang 713801 China

The effect of stress loading direction on microstructure evolution and age-hardening behavior of a stress-aged Mg-7Sn alloy with a compressed stress of 40 MPa at 160 °C was investigated in this paper. The compressive stress perpendicular to the c -axis effectively facilitated the formation of a high volume fraction of twins and Mg 2 Sn phases, thereby promoting a c -axis//ED texture. In contrast, the stress parallel to the c -axis resulted in the formation of small amounts of twins and Mg 2 Sn phases, which further reinforced the basal plane texture. The stress aging with compressive stress applied perpendicular to the c -axis significantly increased the peak hardness of the alloy and reduced the time reached the peak hardness, compared to compressive stress applied parallel to the c -axis. The compressive testing results indicated that the stress peak-aged alloy perpendicular to the c -axis exhibited excellent mechanical properties, whose compressive yield strength, ultimate compressive strength and compressive elongation were 191.3 MPa, 449.9 MPa and 12.6 %, respectively. The high compressive strengths of the peak-aged alloy at a compressive stress perpendicular to the c -axis was mainly attributed to the grain refinement and precipitation strengthening of Mg 2 Sn phase.

关键词： Microhardness

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Analysis of thin-walled shells with inner ribs formed by inner spinning technology

Analysis of thin-walled shells with inner ribs formed by inn...

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作者： Wang, Z. Ma, S. Education Ministry Key Laboratory of Advanced Forging and Stamping Science and Technology College of Mechanical Engineering Yanshan University Qinhuangdao Hebei066004 China Special Material and Technic Institution of Aerospace Beijing100074 China

This study analysed the formation of thin-walled shells with inner reinforcing ribs formed by conventional spinning technology through the design of three different blanks. Various factors and processing parameters, which affected the formation of the product, were studied. It was discovered that the spinning times were influenced by the expansion ratios and the inner ring reinforcing ribs. The impacts of spindle speed and spinning roller radius on the formation of the thin-walled shells with inner ribs were found to be identical. The specimens formed by the inner spinning technology exhibited two kinds of failure modes, which are described and explained. © W. S. Maney & Son Ltd 2015.

关键词： Shells (structures)

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Investigation on the Microstructures and Tensile Properties of TA15 Titanium Alloy Thick-Wall Parts Formed by Laser Rapid Forming Process

Investigation on the Microstructures and Tensile Properties ...

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2012 International Conference on Advances in Materials science and Engineering(AMSE 2012)

作者： Mingzhe Xi Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University) Ministry of Education of China

TA15 titanium alloy thick-wall parts have been deposited by Laser rapid forming(LRF) *** this paper, a new overlap method between two adjacent laser tracks has been used to deposit the thick-wall titanium *** showed that the LRFed thick-wall titanium part was good in shape by using the new overlap *** microstructure of the LRFed titanium alloy primarily consists of columnar prior-beta grain, which is perpendicular to the substrate resulting from directionally *** also could be observed that the size of alpha phase increased with increasing laser power and decreasing scanning *** properties of LRFed titanium was slightly lower than that of the wrought annealed TA15 titanium alloy, after the heat-treatment of 940℃/1h/AC, the heat-treated titanium alloy showed good tensile properties which were equivalent to that of the wrought annealed TA15 titanium alloy.

关键词： Laser rapid forming TA15 titanium alloy Microstructure Tensile properties

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Dynamics analysis and simulation of a new 6-DOF lower limb rehabilitation robot 2

Dynamics analysis and simulation of a new 6-DOF lower limb r...

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2nd International Symposium on Application of Materials science and Energy Materials, SAMSE 2018

作者： Wang, Hongbo Lin, Musong Yan, Yonggan Liu, Guowei Su, Bowen Zhao, Chaosheng Wang, Fuhao Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Yanshan University Qinhuangdao China Academy for Engineering and Technology Fudan University Shanghai China

This paper proposes a new hybrid (parallel-serial) 6-DOF lower limb rehabilitation robot including two mechanical legs and an adjustable seat, which could train in sitting, lying and standing three postures. Each mechanical leg consists of hip joint, knee joint and ankle joint. The dynamics and DOF of the robot are analysed, and the result is verified by the software ADAMS. The result lay the foundation for prototype build in future. © Published under licence by IOP Publishing Ltd.

关键词： Joints (anatomy)

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