Zitieren Sie bitte immer diesen URN: urn:nbn:de:kobv:b43-438500
Fatigue strength and life determination of weldments based on fracture mechanics
- The paper provides an overview on the results of a German cluster project on the use of fracture mechanics to the determination of the fatigue strength of weldments with fatigue cracks originating at the weld toes. The approach includes (a) a concept for short crack propagation for which the common ΔK concept is not applicable and the crack closure effects are still being gradually build-up, (b) a method for determining fatigue life relevant initial crack sizes as they are needed in any fracture mechanics analysis and (c) multiple cracking and crack coalescence at load levels higher than the endurance limit. The analyses are stochastically performed. Both, the endurance limit and the finite life branch of the S-N curve are determined. Besides a brief introduction into the approach, validation examples are presented. These comprise different weldment types (butt welds, cross joints and longitudinal stiffened plates), two steels (S355NL and S960QL) of quite different strengths,The paper provides an overview on the results of a German cluster project on the use of fracture mechanics to the determination of the fatigue strength of weldments with fatigue cracks originating at the weld toes. The approach includes (a) a concept for short crack propagation for which the common ΔK concept is not applicable and the crack closure effects are still being gradually build-up, (b) a method for determining fatigue life relevant initial crack sizes as they are needed in any fracture mechanics analysis and (c) multiple cracking and crack coalescence at load levels higher than the endurance limit. The analyses are stochastically performed. Both, the endurance limit and the finite life branch of the S-N curve are determined. Besides a brief introduction into the approach, validation examples are presented. These comprise different weldment types (butt welds, cross joints and longitudinal stiffened plates), two steels (S355NL and S960QL) of quite different strengths, different weld geometries due to different welding techniques (WIG, MAG), as-welded and stress relieved welds and different stress ratios varying from R = -1 to R = 0.5.…
Autor*innen: | Uwe Zerbst, Mauro Madia, H. Th. Beier |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | 3rd international Symposium on fatigue design and material defects (FDMD 2017) |
Jahr der Erstveröffentlichung: | 2017 |
Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Verlag: | ScienceDirect |
Verlagsort: | Lecco, Italy |
Jahrgang/Band: | 7 |
Erste Seite: | 407 |
Letzte Seite: | 414 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Fatigue strength; Fracture mechanics; Initial crack size; Multiple crack propagation; Short crack propagation; Weldments |
Veranstaltung: | FDMD 2017 |
Veranstaltungsort: | Lecco, Italy |
Beginndatum der Veranstaltung: | 19.09.2017 |
Enddatum der Veranstaltung: | 22.09.2017 |
DOI: | 10.1016/j.prostr.2017.11.106 |
URN: | urn:nbn:de:kobv:b43-438500 |
ISSN: | 2452-3216 |
Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
Lizenz (Deutsch): | Creative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International |
Datum der Freischaltung: | 22.01.2018 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 04.01.2019 |
Schriftenreihen ohne Nummerierung: | Wissenschaftliche Artikel der BAM |