 601A Play AVI
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One of the most interesting problems is dynamic behavior of composite materials, including textile and woven materials under external transient action, in particular impact loading. The important peculiarity of woven structures is the presence of contact interaction between separate fibers. Incidentally, fibers, being in contact interaction, may slide with regard to one another as well as adhere to each other. These peculiarities of material may substantially influence the dynamic behavior of a woven structure as a whole, e.g. in the process of collision with a flying object. It is clear that in order to detect these effects, fibers of a woven structure shall be modeled as three-dimensional elements with all their geometrical features, taking into account their possibility of coming into contact interaction with each other. The presented AVI-files demonstrate the possibility of applying finite element simulation software LS-DYNA for analysis of three-dimensional contact interaction of a woven structure and a ball. With the use of LS-DYNA code the principally new mathematical and finite-element model of a woven structure has been created with subsequent direct simulation of dynamic behavior of each fiber separately and in their contact interaction. One hundred periodicity unit cells have been used for modeling the analyzed woven structure, the number of interwoven fibers and, consequently, contact pairs coming to 361. The total number of elements comes to about 240.000, number of degrees of freedom (NDF) making about 920.000. The ball is modeled as absolutely rigid body. The direction of initial velocity (angle of incidence α) of the ball is varied from 0° to 60° with regard to the normal of the interweaving
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