Behavior of compressive residual stresses in high strength steel welds induced by high frequency mechanical impact treatment
2014 (English)In: Journal of Pressure Vessel Technology-Transactions of the ASME, ISSN 0094-9930, Vol. 136, no 4, 041404- p.Article in journal (Refereed) Published
Residual stress state plays an important role in the fatigue life of welded structures. The effect can be beneficial or detrimental, depending on the nature of residual stresses. High frequency mechanical impact (HFMI) treatment is a postweld fatigue improvement technique for welded joints. In this research work the behavior of compressive residual stresses induced in welded joints in high strength steels (HSS) by HFMI treatment has been investigated. Longitudinal nonload carrying attachments in HSS are tested with constant amplitude (CA) and variable amplitude (VA) fatigue loading. Stress concentration factors have been calculated using finite element analysis (FEA). Residual stresses have been measured at different cycles during fatigue testing using X-ray diffraction technique. It is observed that the induced residual stresses are quite stable with some relaxation in CA and VA loading. The overloads in VA loading seem to be more detrimental. Relaxation of residual stresses is more obvious in VA tests.
Place, publisher, year, edition, pages
2014. Vol. 136, no 4, 041404- p.
Compressive residual stress, Fatigue improvement, Mechanical impacts, Relaxation of residual stress, Residual stress state, Stress concentration factors, Variable amplitudes, X-ray diffraction techniques
Other Mechanical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-145381DOI: 10.1115/1.4026651ISI: 000338507600009ScopusID: 2-s2.0-84898064883OAI: oai:DiVA.org:kth-145381DiVA: diva2:718210
QC 201405202014-05-202014-05-192014-08-05Bibliographically approved