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題目：Structural?Integrity?and?Fatigue?of?Welded?Components?and?Structures
時(shí)間：2025年10月15日 10:00-11:30
地點(diǎn)：機(jī)械與動(dòng)力工程學(xué)院 振華會(huì)議室
邀請(qǐng)人：李永兵 教授、劉恢弘 副教授（薄板結(jié)構(gòu)制造研究所）
Biography
Dr.-Ing.?Majid?Farajian,?received?his?MSc?in?Mechanics?of?Materials?from?the?Royal?Institute?of?Technology?(KTH)?in?Stockholm,?Sweden.?In?2011?he?received?his?PhD?from?the?Faculty?of?Mechanical?Engineering?at?the?University?of?Braunschweig,?Germany.?After?two?years?of?postdoctoral?work,?he?continued?his?work?in?the?field?of?fatigue?and?residual?stresses?at?the?Fraunhofer?Institute?for?Mechanics?of?Materials?IWM?in?Freiburg,?Germany?and?headed?the?“Fatigue”?group?at?the?Fraunhofer?IWM?until?2020.?Since?2020?he?has?been?the?head?of?the?Department?for?design?and?construction?at?the?German?Welding?Society?GSI?in?Duisburg.?As?Chairman?of?Commission?XIII?“Fatigue?of?Welded?Components?and?Structures”?and?Chairman?of?Subcommission?XIII-SC-B?“Fatigue?Improvement?Techniques”?he?takes?responsibilities?within?the?International?Institute?of?Welding?IIW.
For?over?two?decades,?he?has?worked?in?research,?teaching,?and?scientific?management?at?leading?academic?and?non-academic?institutions?in?Sweden,?Germany,?and?Switzerland.?His?career?has?encompassed?the?leadership?of?research?groups?and?departments,?the?successful?acquisition?and?review?of?competitive?funding?from?renowned?organisations?such?as?the?German?Research?Foundation?(DFG),?the?Fraunhofer?Society,?the?German?Federation?of?Industrial?Research?Associa-tions?(AiF),?and?the?European?Research?Council?(ERC).?In?addition,?he?has?carried?out?numerous?research?and?development?projects?in?close?collaboration?with?industrial?partners?in?mechanical?engineering,?materials?science,?manufacturing?technologies,?energy,?and?medical?engineering,?as?well?as?in?the?automotive,?aerospace,?and?rail?sectors.
A?central?focus?of?his?work?has?always?been?promoting?young?researchers.?As?a?supervisor?of?30?bachelor’s?and?master’s?theses?and?7?doctoral?dissertations,?and?postdoctoral?projects,?he?places?great?importance?on?combining?scientific?knowledge?with?creativity,?responsibility,?and?teamwork.?Many?of?his?works?have?been?published?in?80?papers?and?book?chapters,?in?leading?international?journals?and?books?and?presented?at?renowned?conferences.?As?a?university?lecturer,?chair?of?international?expert?committees,?and?editor-in-chief?of?a?peerreviewed?journal?of?the?International?Journal?of?Materials?Joining,?he?has?also?sought?to?bridge?the?gap?between?teaching,?research,?and?the?global?scientific?community.
Abstract
Weld?fatigue?strength?is?currently?the?bottleneck?to?designing?high?performance?and?lightweight?welded?structures?using?advanced?materials.?In?addition?to?loading?conditions,?environmental?aspects,?geometrical?features,?and?defects,?it?has?been?proven?that?studying?the?influence?of?residual?stresses?on?fatigue?performance?is?indispensable.?The?extent?of?the?influence?is?however?a?matter?of?discussion.?A?deeper?insight?into?the?source?of?the?welding?residual?stresses?based?on?sound?physical?principles?would?increase?the?awareness?of?the?extent?of?their?true?threat?to?structural?safety.
For?an?accurate?estimation?of?the?fatigue?performance?of?welded?joints,?not?only?the?initial?residual?stress?field?but?also?its?variation?underload?is?decisive.?The?portion?of?residual?stress?which?stays?stable?can?shift?the?load?stress?range?much?the?same?way?as?the?mean?stresses?do?in?fatigue?loading.?The?relaxation?of?residual?stresses?during?fatigue?loading?however?reduces?this?hazard?to?the?structural?health.?That?is,?before?considering?the?influence?of?residual?stresses?in?fatigue,?the?effect?of?fatigue?on?residual?stresses?should?be?understood.?The?accumulated?knowledge?because?of?research?in?the?field?of?residual?stresses?in?all?the?industrial?disciplines?during?the?last?100?years?is?currently?being?used?as?an?engineering?tool?for?improving?fatigue?properties?of?the?welds.?The?potentials?of?this?engineering?tool?in?designing?and?constructing?new?welded?structures?out?of?higher?strength?materials?is?discussed?within?the?frame?of?“Residual?Stress?Engineering”?at?the?end?of?this?entry.
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ENGLISH
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