BEGIN:VCALENDAR VERSION:2.0 PRODID:-//DTU.dk//NONSGML DTU.dk//EN CALSCALE:GREGORIAN BEGIN:VEVENT DTSTART:20151005T140000 DTEND:20151005T150000 SUMMARY:DCAMM Seminar - Mechanism of Failure in Fatigue and Tribology from Viewpoint of Small Defects and Small Cracks DESCRIPTION:

A DCAMM seminar will be presented by

\n

Professor Yukitaka Murakami
\nKyushu University, Japan 
\n\n
\n

\n

Abstract:
\n
\n 1. Fatigue
\nSome important types of microstructural defects which are detrimental to fatigue strength will be illustrated and discussed in terms of      their size, position, shape, orientation and properties, together with their effect on the fatigue resistance of a material. This will be coupled with a fracture mechanics approach that quantifies their behavior in terms of their relationship to fatigue crack propagation. The boundary condition between failure and non-failure is explored using fracture mechanics as a theoretical condition for a small crack coupled with\nthe Vickers hardness HV of the material that represents the threshold condition (ΔKth).
\nDirections for optimizing microstructure to improve fatigue strength are explained from the viewpoint of quality control based on the statistics of extremes of defects and inclusions.
\n
\n2. Tribology
\nTribology damages so-called pitting and spalling are always originated from a small defect. However, tribology problems have not been  well studied from the viewpoint of fracture mechanics. In this lecture, experimental and fracture mechanics study of the pit formation mechanism under contact fatigue is presented focusing on the effect of reversal of rotation and change of the driving roller.
\nThe measurement of ΔKIIth and ΔKIIIth for several steels and its applications will be presented.

\n

Danish pastry, coffee and tea will be served 15 minutes before the seminar starts.
\n  
\nAll interested persons are invited

X-ALT-DESC;FMTTYPE=text/html:

A DCAMM seminar will be presented by

\n

Professor Yukitaka Murakami
\nKyushu University, Japan 
\n\n
\n

\n

Abstract:
\n
\n 1. Fatigue
\nSome important types of microstructural defects which are detrimental to fatigue strength will be illustrated and discussed in terms of      their size, position, shape, orientation and properties, together with their effect on the fatigue resistance of a material. This will be coupled with a fracture mechanics approach that quantifies their behavior in terms of their relationship to fatigue crack propagation. The boundary condition between failure and non-failure is explored using fracture mechanics as a theoretical condition for a small crack coupled with\nthe Vickers hardness HV of the material that represents the threshold condition (ΔKth).
\nDirections for optimizing microstructure to improve fatigue strength are explained from the viewpoint of quality control based on the statistics of extremes of defects and inclusions.
\n
\n2. Tribology
\nTribology damages so-called pitting and spalling are always originated from a small defect. However, tribology problems have not been  well studied from the viewpoint of fracture mechanics. In this lecture, experimental and fracture mechanics study of the pit formation mechanism under contact fatigue is presented focusing on the effect of reversal of rotation and change of the driving roller.
\nThe measurement of ΔKIIth and ΔKIIIth for several steels and its applications will be presented.

\n

Danish pastry, coffee and tea will be served 15 minutes before the seminar starts.
\n  
\nAll interested persons are invited

URL:http://www.dcamm.dk/da/Kalender/2015/10/Seminar_No_697 DTSTAMP:20260915T113400Z UID:{7366CB5B-70F3-405B-8638-F1330EF35674}-20151005T140000-20151005T140000 LOCATION: Room 025, Building 404, Technical University of Denmark END:VEVENT END:VCALENDAR