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:
A numerical method from the mesoscopic point of view is proposed to describe thefracture process of concrete. At mesoscopic level, concrete is considered as a three-phase compositeconsisting of mortar matrix, coarse aggregate and interfacial transition zone (ITZ) between them.According to the grading of coarse aggregate obtained from sieve analysis, the random aggregatemodels with polygonal aggregates were generated by Monte Carlo random sampling principle. Inthis work, the tensile cracking is assumed to the only failure criterion at the mesoscopic scale; andthe stress-separation law based on the fictitious crack model is adopted to allay the sensitivity onmesh size in the softening regime. The nonlinear finite element method is used in the simulation ofconcrete under bend loading. The influence of the shape of aggregate on the macroscopic responseof concrete is also investigated. Numerical results show that the strength of the specimen withcircular aggregate is higher than the specimen with arbitrary polygonal aggregate. The predictedbending strength agrees well with experimental data
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.213.pdf
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