BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Fatigue strength improvement of high strength steel welded joints 
 treated by high frequency mechanical impact
DTSTART:20121108T121500
DTEND:20121108T131500
DTSTAMP:20260503T111337Z
UID:0e28bc68ce1d2fd5be7521e923fbfee28ba5640d9f26a35390d3690a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Gary Marquis\nAbstract:  In the past decade\, high freq
 uency mechanical impact (HFMI) has significantly developed as a reliable\,
  effective and user-friendly method for post-weld fatigue strength improve
 ment technique for welded structures. The development of an IIW best pract
 ice guideline for implementing HFMI has\nbeen hindered by the lack of dire
 ctly comparable experimental data for numerous HFMI methods. In this study
 \, nominally identical longitudinal non-load carrying attachments in high 
 strength steel\, fy  = 690 MPa\, were manufactured at a single location a
 nd randomly distributed to four HFMI equipment\nmanufacturers for treatmen
 t. Specimens were subsequently returned and fatigue tested on a single mac
 hine using identical variable amplitude loading histories. Detailed specim
 en alignment\, weld profile and HFMI groove measurements were done for eac
 h specimen and X-ray diffraction based residual\nstress measurements were 
 performed on 10 specimens. While clear differences were observed\, the HFM
 I groove dimensions and the resulting residual stress state following trea
 tment were generally similar. Experimental results indicate that all of th
 e HFMI improved welds from the four different HFMI\nequipment manufacturer
 s satisfied the previously proposed characteristic S-N line based on both 
 the material yield strength and the specimen geometry. Results of the stud
 y are valuable and promising with respect to the development of a future g
 uideline. The goal of the study has not been to compare\ntreatments\, so s
 pecific data points are not associated specific HFMI equipment manufacture
 rs.\n\nShort Bio :\nGary Marquis is Professor of Mechanics of Materials\, 
 Aalto University School of Engineering. He received his degrees in mechani
 cal engineering from University of Illinois at Urbana-Champaign (BSc\, MCs
 )\, and Helsinki University of Technology (PhD). He is a worldwide known s
 pecialist in the field of fatigue of steel components and structures. He h
 as published numerous papers and a reference book on multi-axial fatigue w
 ith Prof. Darrell Socie (http://books.sae.org/book-r-234). He is the presi
 dent of Commission XIII of the International Institute of Welding (IIW) "f
 atigue of welded components and structures"\, which is the most active com
 mission in the organization with 50 active members from 20 countries.
LOCATION:GC C330
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR