作者机构：
[Zhang, Haoran] School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, 413000, China;[Chen, Guoming; Zhang, Nan] Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao, 266580, China;[Wang, Rongyao] School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, 413000, China<&wdkj&>Centre for Offshore Engineering and Safety Technology, China University of Petroleum, Qingdao, 266580, China
摘要：
Storms are a major threat to deep-sea mining activities on the high seas. Deep-sea mining takes a long time to prepare to avoid storms, and in some cases it is inevitable to evacuate to avoid storms with risers hung-off. In this work, the evacuation process with risers hung-off is studied, and mechanical properties such as stress and upper rotation of the mining riser system during the process are analyzed. Operation parameters such as speed and heading suitable for evacuation are studied. Evacuation routes of mining ship are optimized based on an improved A* algorithm, and the influencing factors of evacuation operations are analyzed. Research findings can provide guidance for decision-making related to storm avoidance in deep-sea mining and improve the safety of the mining system in the evacuation process.
期刊：
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A,2023年41(6):063110 ISSN：0734-2101
通讯作者：
Xiao, BJ
作者机构：
[Xiao, Baijun] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413000, Hunan, Peoples R China.;[Zhang, Teng Fei] Anhui Univ Technol, Key Lab Green Fabricat & Surface Technol Adv Met M, Minist Educ, Maanshan, Peoples R China.
通讯机构：
[Xiao, BJ ] H;Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413000, Hunan, Peoples R China.
摘要：
Wear resistance is a critical property of tool coatings for high-speed machining, which depends on mechanical properties and oxidation resistance of the coatings. Many works have demonstrated that AlTiSiN coating has good mechanical properties. Additionally, AlCrN coating exhibits excellent oxidation resistance. The multilayered structure has proved to improve comprehensive properties of the coatings. Therefore, AlCrN/AlTiSiN multilayer coating has a high potential to be used in machining applications. This paper focuses on the high-temperature tribological behavior of AlCrN/AlTiSiN multilayer coating. The results show that AlCrN/AlTiSiN coating exhibits good to acceptable wear resistance up to 800 degrees C. Meanwhile, AlCrN/AlTiSiN coating also displays the lowest friction coefficient of similar to 0.5 and a wear rate of 1.8 x 10(-6) mm(3)/N m at 800 degrees C, which is about 58.13% and 64.0% lower than that of AlCrN and AlTiSiN coatings, respectively. The imaging and composition analysis of the high-temperature wear tracks allowed for explaining the differences in wear mechanisms. At 800 degrees C, a dense thin tribofilm is formed on the surface of AlCrN/AlTiSiN coating, which acts as a glaze layer to impede wear. It provides a strategy for enhancing the wear resistance of monolayer coating in high temperatures, which combines the advantages of both high oxidation resistance of one layer and high hardness of the other layer.
摘要：
In this research, the nonlinear dynamics of a clamped circular composite plate placed on a softening elastic foundation under rapid thermal loading is investigated. In this situation, based on the amount of temperature supplied to the structure and the coefficients of softening elastic foundation, two instabilities may happen one after the other. The structure will thermally buckle and deform dynamically if the applied temperature exceeds a critical level. If the softening coefficient of the elastic foundation is critical, the structure will completely lose its stability after a certain deformation range. A polymer containing graphene platelets (GPL) makes up the system. Based on various functions, the volume fraction of fillers varies along the thickness. The system's nonlinear dynamic equations are obtained by applying Hamilton's principle and the Von-Karman theory. The transient heat conduction equation is solved by the cubic B-spline collocation (CBSC) and Crank- Nicolson procedures. The CBSC and the Newmark methods are used to solve spatially and temporally dependent governing nonlinear differential equations. Also, the Newton-Raphson method is used as a powerful tool to solve nonlinear algebraic equations. The temporal evolution, phase-plane, and post-buckling-to-maximum deflection paths are demonstrated to analyze the instabilities of the plate.
期刊：
Journal of Manufacturing Processes,2023年101:795-806 ISSN：1526-6125
通讯作者：
Cui, JJ
作者机构：
[Li, Guangyao; Cui, JJ; Zhu, Jiapei; Cui, Junjia; Chen, Chang; Jiang, Hao; Liu, Quanxiaoxiao] Hunan Univ, State Key Lab Adv Design & Mfg Technol Vehicle, Changsha 410082, Peoples R China.;[Chen, Chang] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413000, Peoples R China.;[Li, Guangyao] Beijing Inst Technol, Shenzhen Automot Res Inst, Shenzhen Res Inst, Natl Engn Lab Elect Vehicles, Shenzhen 518118, Peoples R China.
通讯机构：
[Cui, JJ ] H;Hunan Univ, State Key Lab Adv Design & Mfg Technol Vehicle, Changsha 410082, Peoples R China.
关键词：
Magnetic pulse spot welding;Aluminium alloy sheet;Mechanical property;Micro-morphology
摘要：
Magnetic pulse spot welding (MPSW) is a safe, efficient and environmentally friendly process, which is very suitable for joining aluminium alloys. AA5052 aluminium alloy sheets were joined by MPSW. Specifically, the bump on the flyer plate was driven to impact the parent plate at high velocity to achieve metallurgical bonding. The formation process, mechanical properties and micro-morphology of the joint were studied. The results showed that the bump of the flyer plate impacted the parent plate at high velocity caused by Lorentz force to form welding seam. The shape of the welding seam was two incompletely continuous symmetrical elliptical arcs due to the different welding velocities and welding angles in each zone. The strength of the joint was higher than that of the base metal at appropriate process parameters. Specifically, the relatively better process parameters were welding gap of 1.4 mm, welding diameter of 16 mm and discharge energy of 36 kJ. The maximum loads of tensile shear and cross-tension were 4887 N, 1744 N. There were a large amount of dimples at the fracture of welding seam, and the toughness of joint was good.
通讯机构：
[Wang, CG ] H;Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.
关键词：
Side milling;ZK61M magnesium alloy;Surface quality;Corrosion resistance properties
摘要：
The milling parameters have an important influence on machining performance and surface quality of metal materials. In this paper, the differences in machining and corrosion resistance properties of ZK61M plates under different processing parameters were analyzed by side milling. The milling process was simulated to explore the change laws of milling temperature and milling force. The hardness of machined surface was examined by Vikers hardness tester. The surface quality and the corrosion performances under different spindle speeds were observed by 3D ultra-depth of field microscope. The results showed that the milling temperature was increased as spindle speed and feed speed increased. The influence of spindle speed and feed speed on milling force along the milling direction and the tool direction was significant different. The milled surface had better quality when the spindle speed increased or the feed speed decreased. The hardness standard deviation of machined surface was decreased as the surface quality became better. Besides, it was summarized how spindle speed played a role in corrosion resistance performance by affecting residual stress and metal oxides.
摘要：
Transverse gradient extrusion (TGE) processes with different die inclined angles of 15 degrees, 30 degrees, 45 degrees and 60 degrees were used to produce Mg-3Al-1Zn sheets, thereby tailoring texture and mechanical properties of Mg alloy sheets. Microstructure, deformation texture and final mechanical properties of the obtained sheets were detected and discussed. Furthermore, the rheological behavior of Mg alloys during extrusion was analyzed by finite element method. As the TGE die inclined angle changed, the flow velocity along the transverse direction (TD) and effective strain difference along extrusion direction (ED) were changed during extrusion, and therefore the microstructure and texture of extruded sheets are altered. With increase of TGE die inclined angles, fine grain size and uniform microstructure were obtained. The base poles of most grains for the extruded sheets gradually deviate from normal direction (ND) to ED at center region and inclined from ED to TD at 1/4 edge region. A large elongation of 33.9 % and a low yield stress of 125 MPa can be obtained in the TGE-45 sheet.
作者机构：
[周天乐; 肖忠坤; 姚峰; 袁越阳; 陈家琪] School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, 413099;[袁越阳] Hunan Micomme Medical Technology Co. Ltd., Changsha, 410221;[胡磊] College of Electromechanical Engineering, Shaanxi University of Science & Technology, Xi'an, 710021
摘要：
模块化多电平换流器（Modular Multilevel Converters,MMC）具有维护方便，易扩容等优点，在柔性直流输电（High Voltage Direct Current,HVDC）、电网谐波治理等领域得到广泛应用。但其子模块中的分散电容，在实际使用中会产生谐波环流，影响了模块电容电压波动，降低换流器的安全裕度和经济性。文章首先介绍了MMC组成结构；然后通过建立桥臂瞬时功率方程，分析环流产生机理，并得出桥臂环流中存在二次谐波分量的结论，通过控制直流侧电压与桥臂等效输出电压之间的差值，调节环流中的谐波分量，进而将现阶段国内、外环流抑制方法分为间接环流抑制方法与直接环流抑制方法，并对环流的利用也做了相关阐述。最后对环流抑制存在的问题进行总结与展望。
作者机构：
[Yueyang Yuan; Li Zhou] School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, China;[Yuqing Chen] Department of Respiratory Medicine, Shanghai Chest Hospital, Shanghai, China;[Wei Liu; Zheng Dai] Hunan Micomme Medical Technology Development Co., Ltd., Changsha, China
通讯机构：
[Yueyang Yuan] S;School of Mechanical and Electrical Engineering, Hunan City University, Yiyang, China
关键词：
A;gas exchange mechanisms;high frequency ventilation;mechanical ventilation;R 56;R-1
期刊：
Journal of Materials Research and Technology,2023年23:5181-5192 ISSN：2238-7854
通讯作者：
Hongbo Xia<&wdkj&>Yunwu Ma
作者机构：
[Wang, Qinghang; Wang, Li; Xia, Hongbo; Chen, Shuai; Zhai, Haowei] Yangzhou Univ, Sch Mech Engn, Yangzhou 225127, Peoples R China.;[Wang, Qinghang; Huang, Lixin] CIT Dicastal Co Ltd, Qinhuangdao 066000, Peoples R China.;[Zhao, Jun] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.;[Ma, Yunwu] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai Key Lab Digital Manufacture Thin Walled S, Shanghai 200240, Peoples R China.;[Ma, Yunwu] Shanghai Jiao Tong Univ, Sch Mech Engn, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China.
通讯机构：
[Hongbo Xia; Yunwu Ma] S;School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China<&wdkj&>Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China<&wdkj&>State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
摘要：
Friction stir welding (FSW) is a new solid-state joining process for joining light metals, such as magnesium (Mg) alloys. However, the texture-induced softening mechanism (in stir zone, SZ) tends to cause the worsening of mechanical properties in FSW Mg alloys. In this work, multi-pass hot-rolling and subsequent annealing is used to ameliorate the FSW AZ31 alloy plate. The results show that multi-pass hot-rolling leads to the c-axes of most grains in the SZ approximately perpendicular to the normal direction (ND) transforming into these almost parallel to the ND, accompanied with multiple twin types. After subsequent annealing, twins, as nucleation sites, promote the formation of new grains with off-basal texture, resulting in the weak basal texture. Compared with the FSW plate and the initial plate, the rolled-annealed FSW plate exhibits a relatively uniform hardness distribution and a "strength-ductility" synergy, which are mainly attributed to an appropriate texture feature and a homogeneous grain structure. This work provides a new idea for the development of new high-performance FSW Mg alloys. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC
期刊：
Biomass Conversion and Biorefinery,2023年13(5):3659-3667 ISSN：2190-6815
通讯作者：
Jermsittiparsert, Kittisak
作者机构：
[Dai, Zuocai] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413002, Hunan, Peoples R China.;[Dai, Zuocai] Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Hunan, Peoples R China.;[Chen, Zhengxian] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA.;[Selmi, Abdellatif] Prince Sattam Bin Abdulaziz Univ, Coll Engn, Dept Civil Engn, Al Kharj 11942, Saudi Arabia.;[Selmi, Abdellatif] Ecole Natl Ingenieurs Tunis ENIT, Civil Engn Lab, BP 37, Tunis 1002, Tunisia.
通讯机构：
[Jermsittiparsert, Kittisak] D;[Jermsittiparsert, Kittisak] H;Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam.;Duy Tan Univ, Fac Humanities & Social Sci, Da Nang 550000, Vietnam.;Henan Univ Econ & Law, MBA Sch, Zhengzhou 450046, Henan, Peoples R China.
作者机构：
[Wang, Qinghang; Jiang, Bin; Gao, Yuyang] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China.;[Wang, Qinghang; Wang, Li; Zhai, Haowei] Yangzhou Univ, Sch Mech Engn, Yangzhou 225127, Peoples R China.;[Wang, Qinghang; Huang, Lixin] CIT Dicastal Co Ltd, Qinhuangdao 066000, Peoples R China.;[Zhao, Jun] Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.
通讯机构：
[Yuyang Gao; Bin Jiang] C;College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China<&wdkj&>Authors to whom correspondence should be addressed.
摘要：
In this work, we investigate the impact of Bi addition on the heat resistance of as-extruded AZ31 alloy during high-temperature annealing and hot compression. Electron backscattered diffraction (EBSD) technique and quasi in situ scanning electron microscopy (SEM) are used to analyze the evolution of microstructures during high-temperature annealing and hot compression, respectively. The test results show that with a prolonged annealing time, the as-extruded AZB313 alloy exhibited a lower grain growth rate, due to the pinning effect of Mg3Bi2 phases distributed at grain boundaries. On the other hand, as the compressive temperature increased, the downtrend of strength is delayed in the as-extruded AZB313 alloy. Thermally stable Mg3Bi2 phases dispersed within the grains act as barriers, hindering the motion of dislocations, which not only provides a more effective precipitation strengthening effect, but also increases the resistance to deformation of grains. Moreover, grain boundary sliding can also be restricted by Mg3Bi2 phases located at grain boundaries. This work provides a new idea for the development of heat-resistant wrought Mg alloys.
期刊：
Biomass Conversion and Biorefinery,2023年13(16):15309-15309 ISSN：2190-6815
通讯作者：
Jermsittiparsert, K
作者机构：
[Dai, Zuocai] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413002, Hunan, Peoples R China.;[Dai, Zuocai] Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Hunan, Peoples R China.;[Chen, Zhengxian] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA.;[Selmi, Abdellatif] Prince Sattam Bin Abdulaziz Univ, Dept Civil Engn, Coll Engn, Al Kharj 11942, Saudi Arabia.;[Selmi, Abdellatif] Ecole Natl Ingn Tunis ENIT, Civil Engn Lab, BP 37, Tunis 1002, Tunisia.
通讯机构：
[Jermsittiparsert, K ] D;Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam.;Duy Tan Univ, Fac Humanities & Social Sci, Da Nang 550000, Vietnam.;Henan Univ Econ & Law, MBA Sch, Zhengzhou 450046, Henan, Peoples R China.
作者机构：
[He, Xia] College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Deng, Layun] State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha 410004, China;[Li, Xiazhen] College of Mechanical and Electrical Engineering, Hunan City University, Yiyang 413000, China;Author to whom correspondence should be addressed.;[Li, Xianjun] College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Author to whom correspondence should be addressed.
通讯机构：
[Xianjun Li] C;College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
In this work, a strategy for hybrid treatment was proposed, aiming to present a hybrid impregnation agent including lignin-derived resin (LR) and surface-modified montmorillonite (GMMT) to treat fast-growing poplar wood. The treating agents could penetrate the wood, fill the cavities of the wood interior, and strengthen the cell wall structure. The optimal WPG of 36.2% was obtained upon the response surface methodology (RSM) at the conditions of 34% LR, 1.8% GMMT, 1.2 MPa impregnation pressure, and 99 min impregnation time. The density, water uptake (WU), modulus of rupture (MOR), modulus of elasticity (MOE), and compressive strength (CS) of the samples were tested to evaluate the enhancement of the physical and mechanical properties. In addition, these samples were investigated via cone calorimeter (CONE), Fourier Transform Infrared spectrometer (FTIR), and X-ray diffraction (XRD). The results showed that the density of the treated samples increased significantly up to 0.72 g/cm(3). Compared with 134.8% of the control, the WU of the treated wood sample could decrease to 60.3%. In addition, the MOR and MOE of the resulting samples reached up to 131.8 MPa and 18.14 GPa, respectively, which were 62.3% and 77.7% higher than the control. Notably, the CS was 84.7 MPa with an increase of up to 94.7%. Moreover, the peak heat release rate (HRR) of the treated sample was obviously reduced to 231.33 kW/m(2), a decrease of 17.5% compared to the control (271.71 kW/m(2)).
期刊：
Biomass Conversion and Biorefinery,2023年13(16):15309-15309 ISSN：2190-6815
通讯作者：
Jermsittiparsert, K
作者机构：
[Dai, Zuocai] Hunan City Univ, Coll Mech & Elect Engn, Yiyang 413002, Hunan, Peoples R China.;[Dai, Zuocai] Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Hunan, Peoples R China.;[Chen, Zhengxian] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA.;[Selmi, Abdellatif] Prince Sattam Bin Abdulaziz Univ, Dept Civil Engn, Coll Engn, Al Kharj 11942, Saudi Arabia.;[Selmi, Abdellatif] Ecole Natl Ingn deTunis ENIT, Civil Engn Lab, BP 37,Blvd 1002, Tunis, Tunisia.
通讯机构：
[Jermsittiparsert, K ] D;Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam.;Duy Tan Univ, Fac Humanities & Social Sci, Da Nang 550000, Vietnam.;Henan Univ Econ & Law, MBA Sch, Zhengzhou 450046, Henan, Peoples R China.
摘要：
The role of Zn addition (1, 2 wt%) on the microstructural characteristics and tensile properties of the extruded Mg-1Mn-1Nd (MN11) alloy is discussed. The addition of Zn negligibly influences the particle type; however, Zn addition causes un-homogeneous distribution structure firstly and then develops homogeneous structure because of the change of size and distribution of Mg12Nd particles. The MZN111 sheet shows higher yield strength (YS) along the extrusion direction (ED), and lower YS along the transverse direction (TD), compared to the MN11 sheet. This improvement is attributed to the Zn solute atoms via solid-solution strengthening effect, while the reduction is ascribed to the formation of TD-orientation texture and coalescence of dynamic recrystallized (DRXed) grains. As the Zn content increases to 2 wt%, The MZN121 sheet with highest strength can be ascribed to the homogeneous distribution of finest grains via the grain-boundary strengthening effect and more Zn solute atoms via solid-solution strengthening effect. The increased size of Mg12Nd particles with 1 wt% Zn content and coalescence of DRXed grains, which can significantly reduce the ductility of MZN111 sheet. Further, the ductility enhancement of the MZN121 sheet is mainly due to the homogeneous distribution of fine grains and homogeneous alignment of Mg12Nd particles.
