Experimental studies of fatigue crack growth rate in welded structures of railway bridges
https://doi.org/10.52170/1815-9265_2023_65_82
Abstract
The problem of fatigue cracking in the welded joints of metal bridge spans is one of the most actual nowadays. Today about 20 % of bridge spans with cracks, including non-localized ones, are in operation on the Russian Railways network. At the same time the number of such defects continues to grow and has considerably increased during the last decade. It is necessary to note, that there are rather many researches of fatigue life of welded elements, before crack formation, but there are practically no researches of growth rate and dynamics of their development. Besides, the boundary (critical) sizes of cracks, essentially influencing a condition of constructions, confirmed by calculations are absent.
This paper presents the results of experimental laboratory studies of fatigue crack growth rate similar to T-9 cracks (according to the accepted classification) arising in the nodes of welded metal bridge spans. Laboratory tests were carried out by a patented technique with corresponding control of crack formation. One of the most important components of determining the crack growth rate was to determine the crack length at which its uncontrolled growth occurs. This is necessary to predict the crack growth and to take timely measures to eliminate or inhibit it.
According to the results of the studies, the dependences of the growth rate on various parameters have been obtained. A new parameter of crack growth – acceleration – an increase in the crack growth rate over a certain period of time, which most clearly expresses the beginning of its uncontrolled growth, has been introduced. Stable crack growth is observed during 1.6 million load cycles with a gradual increase in the growth rate, with crack length during this period varying from 30 to 160 mm. At a crack length of 160 mm and a growth rate of 1.3·10–4 mm/cycle a significant increase in the growth rate begins, which allows us to accept these parameters as critical, at which uncontrolled crack growth begins.
About the Authors
М. Yu. Malikov
Siberian Transport University
Russian Federation
Russian Federation
Mikhail Yu. Malikov – Engineer, Siberian Research Institute of Bridges
Novosibirsk
L. Yu. Solovyеv
Siberian Transport University
Russian Federation
Russian Federation
Leonid Yu. Solovyev – Associate Professor of the Bridge Department, Head of the Department of Automated Information Systems for Numerical Calculation Methods Siberian Research Institute of Bridges, Candidate of Engineering
Novosibirsk
A. A. Nerovnykh
Siberian Transport University
Russian Federation
Russian Federation
Aleksey A. Nerovnykh – Associate Professor of the Bridges Department, Head of the Department of Innovative Methods of Repair and Strengthening of Bridges Siberian Research Institute of Bridges, Candidate of Engineering
Novosibirsk
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Review
For citations:
Malikov М.Yu., Solovyеv L.Yu., Nerovnykh A.A. Experimental studies of fatigue crack growth rate in welded structures of railway bridges. Bulletin of Siberian State University of Transport. 2023;(2):82-90. (In Russ.) https://doi.org/10.52170/1815-9265_2023_65_82
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