Fracture mechanics based analysis of the fatigue life of defective welded joints

0524005 - ÚTAM 2021 RIV JP eng J - Journal Article
Gajdoš, Lubomír - Šperl, Martin
Fracture mechanics based analysis of the fatigue life of defective welded joints.
Materials Transactions. Roč. 61, č. 5 (2020), s. 926-934. ISSN 1345-9678. E-ISSN 1347-5320
R&D Projects: GA TA ČR(CZ) TE02000162
Institutional support: RVO:68378297
Keywords : welded structures * weld discontinuities * arc welding * carbon manganese steel * fatigue * stress intensity factor
OECD category: Applied mechanics
Impact factor: 1.389, year: 2020
Method of publishing: Open access
https://doi.org/10.2320/matertrans.MT-M2019258

This work was motivated by the endeavour to experimentally determine the influence of crack position on the fatigue life of weldments. Plates were cut from a pipe of X52 pipeline steel 830 mm in diameter and 10mm in wall thickness and their contact edges were then prepared for single-bevel butt welds. The plates were then welded by manual arc welding, and separate specimens 10 mm in width and 5 mm in thickness were cut from the weldment perpendicularly to the weld bead. The electro-spark method was then used to produce blunt crack discontinuities for the initiation of fatigue cracks. The cracked weldment specimens then underwent cyclic loading at reference force level Fmax = 5.5 kN and stress asymmetry ratio R = Fmin/Fmax = 0.1. The test results made it possible to quantify the effects of the size and position of crack-like discontinuities on weld fatigue life.
Permanent Link: http://hdl.handle.net/11104/0308317