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:
Multiple collinear surface cracks distributed that are randomly along a weld toe have astrong influence on the fatigue crack propagation life of welded joints. This issue is investigated usingstatistical approaches based on series of systematic experiments, in which initial crack numbers, theirlocations and crack sizes, i.e. depth and length, are taken into account. The number of initial cracksfollow a normal distribution, and the probability of initial crack depths and lengths can be accuratelydescribed by the Weibull distribution. These characteristics are used to calculate the fatigue crackpropagation life, in which the mechanisms of the mutual interaction and the coalescence of multiplecracks are considered as well as the Mk-factors. The automatic calculation of fatigue crackpropagation life is achieved by the application of NESUSS, where parameters such as the number,location and size of cracks are all treated as random variables. The random variables are dealt througha Monte-Carlo simulation with sampling random numbers of 2,000. The results of the simulationprovide the statistical characteristics of the fatigue crack propagation life for welded joints as afunction of the number of initial cracks. The sum of the simulation results and the fatigue crackinitiation life referred from a previous paper is in good agreement with the experimental results
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.615.pdf
