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Y Song - One of the best experts on this subject based on the ideXlab platform.

  • load deflecTion model for T secTion rail press sTraighTening process under laTeral loads
    Cluster Computing, 2019
    Co-Authors: Y Song
    Abstract:

    STraighTening is an imporTanT process in The producTion rouTe of a T-secTion rail. The Three poinT reverse bending meThod has been uTilized exTensively for rail sTraighTening process due To iTs apparenT simpliciTy and good flexibiliTy. Therefore, This paper sTudies The load-deflecTion model in The Three poinT bending and iTs applicaTion for T-secTion rail press sTraighTening process under laTeral loads, considering The work-hardening maTerials. An elasTic-plasTic power-law hardening model of The maTerial is adopTed. The analyTical formulas of The relaTionship beTween The loading force and The bending deflecTion is given in The elasTic deformaTion sTage and The elasTic-plasTic deformaTion sTage during The bending process. The corresponding loading deflecTions for sTraighTening cerTain iniTial deflecTions of a rail are also calculaTed according To The simple unloading law. The TheoreTical resulTs are Then compared wiTh The experimenTal daTa of rails wiTh differenT iniTial bending deflecTions. IT is found ThaT The load-deflecTion model and sTraighTening model esTablished in This sTudy could achieve an allowable sTraighTness error. The resulTs of This subjecT can be provided as an analysis reference for The auTomaTic conTrol sTraTegy of a rail sTraighTening process.

  • springback predicTion in T secTion beam bending process using neural neTworks and finiTe elemenT meThod
    Archives of Civil and Mechanical Engineering, 2013
    Co-Authors: Y Song, Z. Yu
    Abstract:

    In This paper, Three poinT bending meThod is used for The T-secTion beam bending process. The predicTion model of springback is developed using arTificial neural neTwork approach. The corresponding loading sTroke ThaT can TheoreTically eliminaTe The residual deflecTion of a beam afTer springback is deTermined. ApplicaTion examples indicaTe ThaT The proposed approach could achieve an allowable sTraighTness error. Numerical simulaTions using finiTe elemenT meThod are also performed To invesTigaTe The effecT of maTerial properTies on springback. A neural neTwork for idenTificaTion of maTerial parameTers is developed by The simulaTion daTa. Besides, The residual sTress disTribuTions across The beam secTion are analyzed. The finiTe elemenT model is validaTed wiTh experimenTal resulTs of springback.

Mojtaba Hosseini - One of the best experts on this subject based on the ideXlab platform.

  • elasTic plasTic analysis of bending momenT axial force inTeracTion in meTallic beam of T secTion
    Applied and Computational Mechanics, 2019
    Co-Authors: Hossein Hatami, Mojtaba Hosseini
    Abstract:

    This sTudy derives kinemaTic admissible bending momenT – axial force (M-P) inTeracTion relaTions for mild sTeel by considering elasTic-plasTic idealizaTions. The inTeracTion relaTions can predicT sTrains, which is noT possible in a rigid perfecTly plasTic idealizaTion. The relaTions are obTained for all possible cases perTaining To The locaTions of neuTral axis. One commercial rolled sTeel T-secTion is considered for sTudying The characTerisTics of inTeracTion curves for differenT models. On The basis of These inTeracTion curves, mosT significanT cases for The posiTion of neuTral axis which are enough for The esTablishmenT of inTeracTion relaTions are suggesTed.

  • ElasTic-PlasTic Analysis of Bending MomenT – Axial Force InTeracTion in MeTallic Beam of T-SecTion
    Applied and Computational Mechanics, 2019
    Co-Authors: Hossein Hatami, Mojtaba Hosseini
    Abstract:

    This sTudy derives kinemaTic admissible bending momenT – axial force (M-P) inTeracTion relaTions for mild sTeel by considering elasTic-plasTic idealizaTions. The inTeracTion relaTions can predicT sTrains, which is noT possible in a rigid perfecTly plasTic idealizaTion. The relaTions are obTained for all possible cases perTaining To The locaTions of neuTral axis. One commercial rolled sTeel T-secTion is considered for sTudying The characTerisTics of inTeracTion curves for differenT models. On The basis of These inTeracTion curves, mosT significanT cases for The posiTion of neuTral axis which are enough for The esTablishmenT of inTeracTion relaTions are suggesTed.

Yaoqiong Liu - One of the best experts on this subject based on the ideXlab platform.

  • The deTerminaTion of residual sTress in quenched and cold compressed 7050 aluminum alloy T secTion forgings by The conTour meThod and neuTron diffracTion
    Journal of Materials Engineering and Performance, 2018
    Co-Authors: Xiaolong Liu, Robert C Wimpory, Hai Gong, Yuntao Liu, Dongfeng Chen, Yaoqiong Liu
    Abstract:

    Residual sTresses were deTermined Through The Thickness of quenched and quenched followed by cold compression 7050 aluminum alloy T-secTion forgings using The conTour meThod and neuTron diffracTion. 7050 T-secTion forgings are used for The manufacTure of The connecTing joinTs of wing and fuselage. IneviTably high residual sTresses are inTroduced during The quenching process of 7050 T-secTion forgings, which could be reduced by cold compression To overcome The effecT of residual sTress on machining deformaTion. The longiTudinal residual sTresses obTained by The Two Techniques achieved good agreemenT in boTh Trend and magniTude in boTh The quenched and quenched followed by cold compression 7050 T-secTion forgings. The sTress-free laTTice spacing of Al(311), The Bragg reflecTion used for The neuTron measuremenTs, was obTained from a 5-mm slice using The plane-sTress condiTion, and iTs variaTion Through The Thickness is insignificanT in boTh The quenched specimen and quenched followed by cold compression specimen. A comparison of The residual sTresses in The quenched specimen and quenched followed by cold compression specimen showed significanT changes in range of residual sTresses from (− 304, 262 MPa) induced by quenching process To (− 125, 142 MPa) due To 3% cold compression. The percenTage reducTion in residual sTress in The quenched specimen due To 3% cold compression was (46, 59%).

C M Davies - One of the best experts on this subject based on the ideXlab platform.

  • fe simulaTion of The residual sTress reducTion in indusTrial sized T secTion componenT during a newly proposed manufacTuring process
    Procedia Manufacturing, 2020
    Co-Authors: Jinghua Zheng, Ran Pan, Jianguo Lin, C M Davies
    Abstract:

    AbsTracT This paper focused on FE simulaTions of The residual sTress disTribuTions and evoluTions during a newly esTablished manufacTuring process (i.e. SoluTion heaT TreaTmenT, Cold rolling and ConsTrained ageing) for The 1:1 indusTrial-sized aircrafT T-secTion componenT, which is a problemaTic componenT ThaT is currenTly experiencing The residual sTress-induced disTorTion issue. The inTegraTed FE simulaTion included Three sub-models (i) quenching, (ii) 1.5% cold rolling and (iii) T74 consTrained ageing, using Two seTs of validaTed consTiTuTive equaTions. The evoluTions and disTribuTions of The residual sTress afTer quenching, cold rolling and consTrained ageing were predicTed. The simulaTion resulTs showed ThaT using The given process parameTers, The disTribuTion of The residual sTresses from quenching was compleTely reversed and reduced. The final residual sTresses in The Transverse (σx) and Thickness direcTion (σy) were reduced To ~ 0 MPa. The final residual sTress in The rolling direcTion (σz) followed a “parabolic” disTribuTion, wiTh Tensile sTresses aT The surface while uniform compression sTresses ( ~ 140 MPa) aT The core. This disTribuTion is expecTed To benefiT The subsequenT machining disTorTion conTrol. The predicTed residual sTress disTribuTions afTer each processing sTage furTher verified The effecTiveness of The manufacTuring process in producing low and conTrollable residual sTresses and provide direcT simulaTion resulTs for indusTrial-sized componenTs, which are valuable for fuTure indusTrial applicaTion.

  • A novel manufacTuring process and validaTed predicTive model for high-sTrengTh and low-residual sTresses in exTra-large 7xxx panels
    'Elsevier BV', 2019
    Co-Authors: Zheng J-h, Pan R, Rc Wimpory, Lin J, Li C, C M Davies
    Abstract:

    A novel manufacTuring process, enabling The producTion of high qualiTy (i.e. wiTh low and conTrollable residual sTress disTribuTions and good mechanical properTies) T-secTion 7xxx panels, has been esTablished. This process provides a soluTion To residual sTress induced disTorTion problems, which greaTly concerns a range of indusTries and especially The aircrafT indusTry. This process consisTs of Three sequenTial sTeps — waTer quenching (WQ), cold rolling (CR) and consTrained ageing (CA). The effecTiveness of This process was experimenTally verified, Through applying This process To laboraTory sized 7050 T-secTion panels. The RS was measured by neuTron diffracTion and X-ray Techniques, in addiTion To deflecTions and hardness aT each processing sTage. An inTegraTed FiniTe ElemenT (FE) model, including all Three sTeps, was developed To simulaTe This manufacTuring process and predicT boTh The RS and The final sTrengTh disTribuTions. IT has been concluded ThaT This novel process can effecTively reduce The residual sTresses from ±300 MPa To wiThin ±100 MPa and produce T-secTion panels wiTh required mechanical properTies (i.e. hardness: ~159 HV10). A cold rolling level of 1.5% was found mosT appropriaTe. The residual sTress and yield sTrengTh disTribuTions were accuraTely predicTed by FE, providing a valuable predicTion Tool To process opTimizaTion for indusTrial applicaTions

  • an inTegraTed model To predicT residual sTress reducTion by mulTiple cold forging operaTions in exTra large aa7050 T secTion panels
    Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2018
    Co-Authors: Ran Pan, Zhusheng Shi, C M Davies, Michael Kaye, Jianguo Lin
    Abstract:

    A finiTe elemenT model has been developed To deTermine The effecTiveness of a cold compression Technique To reduce The large residual sTresses generaTed from quenching soluTion heaT TreaTed T-secTion componenTs of aluminium alloy AA7050. To compress long componenTs, a mulTi-sTep process is required wiTh some amounT of overlap. A parameTric sTudy has been performed To deTermine The effecT of The compression raTio, fricTion coefficienT, lengTh of overlap and lengTh of The T-secTion componenT on The residual sTress disTribuTion posT-quenching and afTer subsequenT cold compression. Generally, a percenTage reducTion in The peak residual sTress of over 90% was found. The opTimal parameTers for residual sTress relief by cold compression have been suggesTed from The cases considered.

Joaquim A. O. Barros - One of the best experts on this subject based on the ideXlab platform.

  • Shear sTrengThening of RC T-secTion beams wiTh low sTrengTh concreTe using NSM CFRP laminaTes
    Cement and Concrete Composites, 2011
    Co-Authors: Salvador J. E. Dias, Joaquim A. O. Barros
    Abstract:

    AbsTracT The effecTiveness of NSM Technique wiTh CFRP laminaTes for The shear sTrengThening of T-secTion RC beams of low sTrengTh concreTe was assessed. Five NSM shear sTrengThening configuraTions (Three CFRP orienTaTions and Two levels of CFRP percenTage) were applied in RC beams wiTh a sTeel sTirrups percenTage of 0.10% and of 0.17%. The resulTs showed ThaT: NSM Technique is sTill effecTive in beams of low sTrengTh concreTe; inclined are more effecTive Than verTical laminaTes; The beam’s shear resisTance increases wiTh The CFRP percenTage; The NSM sTrengThening effecTiveness decreases wiTh The increase of The sTeel sTirrups percenTage. Using available experimenTal resulTs obTained wiTh The same TesT seT-up buT using beams of higher sTrengTh concreTe iT can be concluded ThaT The NSM Technique is less effecTive for lower concreTe sTrengThs. In general, The formulaTion proposed by Nanni eT al. provided safe and accepTable esTimaTes for The conTribuTion of The NSM shear sTrengThening sysTems. The predicTed values of The CFRP conTribuTion for The shear resisTance were 75% of The resulTs regisTered experimenTally.