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Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures

Hyungjoo CHOI, Husam NAJM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 199-214 doi: 10.1007/s11709-019-0592-9

Abstract: Stiffened and unstiffened fillet-welded tube-to-transverse plate connection details are widely used forrepetitive wind loads, cyclic fatigue stresses are induced and they are the primary source of failure in weldedThe main objective of this study is to evaluate fatigue resistance of fillet-welded tube connection detailsfatigue life, fatigue damage, and fatigue safety factor to determine the fatigue performance of fillet-weldedThe results of this investigation provides fatigue resistance of fillet-welded connection details in

Keywords： fatigue     weld connections     base plate     fillet welds    

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Cracking evolution behaviors of lightweight materials based on

Y. Luo, S. C. Wu, Y. N. Hu, Y. N. Fu

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 4,   Pages 461-481 doi: 10.1007/s11465-018-0481-2

Abstract: for pure aluminum, aluminum alloy matrix, aluminum alloy metal matrix composite, and aluminum alloy weldedFor the hybrid laser welded aluminum alloy, fatigue cracks usually initiate from gas pores located at

Keywords： fatigue crack initiation and growth     fatigue damage mechanism     damage tolerance     defect characterization     laserwelded aluminum alloys    

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Structure and performance of welding joint of Q235 steel welded by SHS welding

Junzhi HU, Sumei WANG, Xiaoli ZHAO, Shilin ZHU, Botao YU,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2,   Pages 189-193 doi: 10.1007/s11465-010-0003-3

Abstract: A self-propagating high-temperature synthesis (SHS) welding-pen that can weld steel workpiece from 6 to 10 mm is developed and welds the Q235 steel. The structure and properties of the welding joint are studied. The result indicates that this type of welding is melting and the fusion zone is clear. The tensile-strength of the welding joint is 283 MPa, flexural strength is 628 MPa, impact toughness is 46.43 J·cm, and the microhardness of the welding joint and fusion zone are 230 HV and 255.6€HV, respectively. The mircohardness of the fusion zone and the welding line are higher than that of the matrix.

Keywords： self-propagating high-temperature synthesis (SHS) welding     welding line     structure and performance     melting    

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Development of Laser Cutting and Joining Processing

Chen Li, Gong Shuili, He Enguang

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 78-84 doi: 10.15302/J-SSCAE-2020.03.012

Abstract:

Laser cutting and joining technology is indispensable as an advancedbe surely promoted by the integration of laser technology and digital manufacturing technology.joining and cutting technology, namely, laser welding, laser cutting, laser drilling, and laser markingThe problems faced by the development of the laser joining and cutting technology are discussed.unit, laser materials processing, and intelligent integration.

Keywords： laser material processing     laser welding     laser cutting     laser drilling     laser marking    

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Temperature field simulation of laser homogenizing equipment

Juanjuan WANG, Yunshan WANG, Fudong ZHU

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1,   Pages 49-52 doi: 10.1007/s11465-009-0005-1

Abstract: The laser homogenizing equipment was devised using the ring scanning principle.A laser scanning ring facula is obtained when the laser beam goes through the equipment’s optical systemhardness layer and better process quality can be attained using the ring facula optimized for metal laser

Keywords： laser homogenizing technology     laser scanning ring facula     temperature field    

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Strategic Research on China’s Laser Technology and Its Application by 2035

Research Group of Strategic Research on China’s Laser Technology and Its Application by 2035

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 1-6 doi: 10.15302/J-SSCAE-2020.03.001

Abstract:

To promote the development of laser technology and its application, theAcademy of Engineering launched a major consulting project “Strategic Research on China’s LaserIt briefly analyzes laser technology and its instrumental, leading, and disruptive role in scientificinnovation ecology of laser industry.cultivation of the laser and optical disciplines.

Keywords： laser technology，laser manufacturing，laser communication，laser diagnosis and treatment    

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Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0703-5

Abstract: In fiber laser beam welding (LBW), the selection of optimal processing parameters is challenging andEM constructs the correlation between processing parameters (laser power, welding speed, and distance

Keywords： laser beam welding     parameter optimization     metamodel     multi-objective    

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Development of lunar regolith composite and structure via laser-assisted sintering

Frontiers of Mechanical Engineering doi: 10.1007/s11465-021-0662-2

Abstract: In this paper, a laser-assisted additive manufacturing process is developed to fabricate lunar regolithcombination of composite material compositions and process parameters are mixing ratio of 50/50 in volume, laserThereafter, the mechanical properties of laser-sintered lunar regolith composites are implemented toThe effectiveness and the feasibility of this laser-assisted process are potentially developed for future

Keywords： in situ manufacturing     laser-assisted powder fusion process     mechanical properties     topological    

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Strength of tubular welded joints of roof trusses in Shanghai Qizhong Tennis Center

TONG Lewei, GU Min, CHEN Yiyi, ZHOU Liying, SUN Jiandong, CHEN Yangji, LIN Yingru, LIN Gao

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 1,   Pages 30-36 doi: 10.1007/s11709-008-0010-1

Abstract: Static strength of multi-planar welded joints with seven brace members and one chord member made of circular

Keywords： diameter     numerical analysis     calculation     thickness     engineering    

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Ultrasonic assisted EDM: Effect of the workpiece vibration in the machining characteristics of FW4 Welded

Mohammadreza SHABGARD, Hamed KAKOLVAND, Mirsadegh SEYEDZAVVAR, Ramin Mohammadpour SHOTORBANI

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 4,   Pages 419-428 doi: 10.1007/s11465-011-0246-7

Abstract:

This paper presents the results of experimental studies carried out to conduct a comprehensive investigation on the influence of ultrasonic vibration of workpiece on the characteristics of Electrical Discharge Machining (EDM) process of FW4 Welding Metal in comparison with the conventional EDM process. The studied process characteristics included the material removal rate (MRR), tool wear ratio (TWR), and surface roughness (Ra and Rmax) of the workpiece after the EDM and ultrasonic assisted EDM (US-EDM) processes. The experiments performed under the designed full factorial procedure and the considered EDM input parameters included pulse on-time and pulse current. The experimental results show that in short pulse on-times, material removal rate in the US-EDM process is approximately quadruple than that of the EDM process. On the contrary, in the long pulse on-times, ultrasonic vibration of work??piece leads to the reduction in the MRR. On the other hand, in short pulse on-times, the TWR in the US-EDM process is lower than that of in the EDM process, and this condition reverses with increase in the pulse on-time. Furthermore, the surface roughness of the workpiece machined by EDM process is slightly lower than that of applied to the US-EDM process.

Keywords： electrical discharge machining (EDM)     material removal rate (MRR)     tool wear ratio (TWR)     surface roughness    

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Development of Laser Surface Modification Technology

Zhang Qunli, Wang Liang, Mei Xuesong, Yao Jianhua

Strategic Study of CAE 2020, Volume 22, Issue 3,   Pages 71-77 doi: 10.15302/J-SSCAE-2020.03.010

Abstract:

The laser surface modification technology uses high-energy-density laserAfter decades of development, laser surface modification technology has been widely applied to aerospaceTaking three typical laser surface modification technologies—laser shock processing, laser quenchingsurface modification, on-site laser remanufacturing, laser shock processing with controlled shape andperformance, intelligent laser surface modification, and laser surface micro-structure preparation.

Keywords： laser surface modification     laser shock processing     laser quenching     laser cladding     development trend    

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Advances in polishing of internal structures on parts made by laser-based powder bed fusion

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0724-0

Abstract: Considering the manufacturing of inner structures, laser-based powder bed fusion (L-PBF) is an attractive

Keywords： laser-based powder bed fusion     polishing     internal structures     surface quality     surface features     post    

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zone-layered trimming method for ceramic core of aero-engine blade based on an advanced reconfigurable laser

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0675-5

Abstract: This paper proposes an ultrafast laser processing system for trimming complex ceramic structural partsOpto-electromechanical cooperative control software is developed to control the laser processing systemThe results show that the laser system and the method proposed in this paper are suitable for trimming

Keywords： ceramic parts trimming     computer-aided laser manufacturing     3D vision     reconfigurable laser processing    

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Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4,   Pages 393-401 doi: 10.1007/s11465-019-0550-1

Abstract: The method combines digital patternless casting and high-power laser cladding.Results prove that the laser cladding layer exceeds HRC60 (Rockwell hardness) and thus meets the production

Keywords： patternless casting     laser cladding     hybrid forming     rapid tooling    

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Structure improvement and strength finite element analysis of VHP welded rotor of 700°C USC steam turbine

Jinyuan SHI,Zhicheng DENG,Yong WANG,Yu YANG

Frontiers in Energy 2016, Volume 10, Issue 1,   Pages 88-104 doi: 10.1007/s11708-015-0387-1

Abstract: The main parameters of steam and the steam thermal parameters of blade stages of VHP welded rotors asstructure design feature, the mechanical models and the typical position of stress analysis of the VHP weldedemergency shutdown, to obtain the temperature and stress distribution as well as the stress ratio of the weldedThe strength design criteria and strength analysis results of the welded rotor are given.The results show that the strength design of improved structure of the VHP welded rotor of the 700°C

Keywords： 700°C ultra-super-critical unit     steam turbine     very high pressure rotor     structure strength design     strength design criteria     finite element analysis    

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Title Author Date Type Operation

Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures

Hyungjoo CHOI, Husam NAJM

Journal Article

Cracking evolution behaviors of lightweight materials based on

Y. Luo, S. C. Wu, Y. N. Hu, Y. N. Fu

Journal Article

Structure and performance of welding joint of Q235 steel welded by SHS welding

Junzhi HU, Sumei WANG, Xiaoli ZHAO, Shilin ZHU, Botao YU,

Journal Article

Development of Laser Cutting and Joining Processing

Chen Li, Gong Shuili, He Enguang

Journal Article

Temperature field simulation of laser homogenizing equipment

Juanjuan WANG, Yunshan WANG, Fudong ZHU

Journal Article

Strategic Research on China’s Laser Technology and Its Application by 2035

Research Group of Strategic Research on China’s Laser Technology and Its Application by 2035

Journal Article

Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC

Journal Article

Development of lunar regolith composite and structure via laser-assisted sintering

Journal Article

Strength of tubular welded joints of roof trusses in Shanghai Qizhong Tennis Center

TONG Lewei, GU Min, CHEN Yiyi, ZHOU Liying, SUN Jiandong, CHEN Yangji, LIN Yingru, LIN Gao

Journal Article

Ultrasonic assisted EDM: Effect of the workpiece vibration in the machining characteristics of FW4 Welded

Mohammadreza SHABGARD, Hamed KAKOLVAND, Mirsadegh SEYEDZAVVAR, Ramin Mohammadpour SHOTORBANI

Journal Article

Development of Laser Surface Modification Technology

Zhang Qunli, Wang Liang, Mei Xuesong, Yao Jianhua

Journal Article

Advances in polishing of internal structures on parts made by laser-based powder bed fusion

Journal Article

zone-layered trimming method for ceramic core of aero-engine blade based on an advanced reconfigurable laser

Journal Article

Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Journal Article

Structure improvement and strength finite element analysis of VHP welded rotor of 700°C USC steam turbine

Jinyuan SHI,Zhicheng DENG,Yong WANG,Yu YANG

Journal Article