000015955 001__ 15955
000015955 005__ 20161115135334.0
000015955 04107 $$aeng
000015955 046__ $$k2013-06-12
000015955 100__ $$aWu, Y.
000015955 24500 $$aA Point-Wise Coupled Fem/Rkpm Formulation for Modeling Fragmentation of Concrete Under High Strain Rate Loadings

000015955 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015955 260__ $$bNational Technical University of Athens, 2013
000015955 506__ $$arestricted
000015955 520__ $$2eng$$aAn evolutionarily coupled finite element and meshfree formulation was developed in a previous study [1]. The formulation affords a novel capability to compute the responses of concrete structures subjected to quasi-static, blast, and impact loadings. In the previous work, the coupling / meshfree domain advances automatically using a cylinder defined by a normal and a radius that expands according to certain triggering criterion. This approach provides a much larger but less than optimal meshfree domain since it covers all the elements / nodes inside the cylinder volume. In this study, the coupling method is expanded by using a point-wise coupling technique so that the coupling / meshfree domain can treat very localized damage when the triggering criterion is met. In this approach, each integration point (or node) might define a coupling / meshfree zone (see Figure 1), whereas, only one meshfree domain is defined in the previous scheme. The coupling / meshfree zones are treated as sphere volumes in three-dimension and circular areas in two-dimension. Separating the coupling / meshfree zones in this manner makes a convenient and more accurate domain from which to track the debris mass and velocity distributions, which is of great interest in many applications. Furthermore, to improve the computational efficiency, the flexible-to-rigid contact algorithm used in the previous studies is extended to flexible-to-flexible contact [2]. With this contact algorithm, the high velocity impact penetration problem can be analyzed by Lagrangian formulation, which is more efficient than the semi-Lagrangian approach. R2

000015955 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015955 653__ $$a

000015955 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015955 720__ $$aWu, Y.$$iMagallanes, J.$$iCrawford, J.
000015955 8560_ $$ffischerc@itam.cas.cz
000015955 8564_ $$s59169$$uhttps://invenio.itam.cas.cz/record/15955/files/2011.pdf$$yOriginal version of the author's contribution as presented on CD, section: SC-MS 05 MESHFREE AND PARTICLE METHODS FOR SEVERE LOADINGS
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000015955 962__ $$r15525
000015955 980__ $$aPAPER