ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The behavior of crack growth with a view to fatigue damage accumulation on the tip ofcracks is discussed. Fatigue life of welded components with initial crack in bridges under trafficloading is investigated. The study is presented in two parts. Firstly, a new model of fatigue crackgrowth for welded bridge member under traffic loading is presented. And the calculate method ofthe stress intensity factor necessary for evaluation of the fatigue life of welded bridge members withcracks is discussed. Based on the concept of continuum damage accumulated on the tip of fatiguecracks, the fatigue damage law suitable for steel bridge member under traffic loading is modified toconsider the crack growth. The proposed fatigue crack growth can describe the relationship betweenthe cracking count rate and the effective stress intensity factor. The proposed fatigue crack growthmodel is then applied to calculate the crack growth and the fatigue life of two types of weldedcomponents with fatigue experimental results. The stress intensity factors are modified by the factorof geometric shape for the welded components in order to reflect the influence of the welding typeand geometry on the stress intensity factor. The calculated and measured fatigue lives are generallyin good agreement, at some of the initial conditions of cracking, for a welded component widelyused in steel bridges
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.251.pdf
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