1,720,989 research outputs found
A DOMAIN DECOMPOSITION APPROACH FOR ELASTIC SOLIDS WITH DAMAGEABLE INTERFACES
No full textThis paper concerns a dual domain decomposition approach, able to handle the presence of localized nonlinearity in an elastic solid, due to damage and fracture phenomena. The proposal extends the multi-time-step coupling method for structural dynamics, proposed by Gravouil and Combescure. The main idea is to concentrate the non linearity due to dam-age at the interface level, there enforcing a non linear interface law
8-Node solid-shell elements selective mass scaling for explicit dynamic analysis of layered thin-walled structures
Get PDFTo overcome the issue of spurious maximum
eigenfrequencies leading to small steps in explicit time integration,
a recently proposed selective mass scaling technique,
specifically conceived for 8-node hexahedral solid-shell elements,
is reconsidered for application to layered shells,where
several solid-shell elements are used through the thickness
of thin-walled structures. In this case, the resulting scaled
mass matrix is not perfectly diagonal. However, the introduced
coupling is shown to be limited to the nodes belonging
to the same fiber through the thickness, so that the additional
computational burden is almost negligible and by far
compensated by the larger size of the critical time step. The
proposed numerical tests show that the adopted mass scaling
leads to a critical time step size which is determined by the
element in-plane dimensions only, independent of the layers
number, with negligible accuracy loss, both in small and
large displacement problems
Explicit simulation of blade cutting and through-the-thickness fracture in multi-layer, thin-walled structures
Get PDFSelective mass scaling for thin structures discretized with multi-layered, solid-shell elements
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Domain decomposition strategies for the simulation of fracture processes in polysilicon microsystems
No full textIn this work a numerical approach to deal with the fracture anisotropy of polycrystalline silicon for microsystems is presented. Because of the micro-scale level of interest in nowadays microsytem structures, an heterogeneous continuum is used where fractures are allowed for both trans- and inter-granular in the material, and silicon grain morphology is artificially reconstructed
Selective mass scaling for multi-layer solid-shell discretization of thin-walled structures
Get PDFThe computational burden of an explicit dynamic analysis of thin-walled structures discretized with solid-shell
elements can be very high, since the stability condition leads to extremely low time steps because of the small
thickness. A selective mass scaling procedure ([1], [2],[3]) can be introduced to overcome this limitation. The
technique proposed in [4] for single-layer 8-node solid-shell elements is here generalized to the case of multi-layer
shells. The idea is to modify the mass matrix, scaling down the highest structural eigenfrequencies, so that the
critical time step is determined only by the in-plane size of the elements, as with standard four-nodes shell meshes.
Moreover, the resulting critical time step is shown to be independent of the number of layers used for the throughthe-
thickness discretization. The accuracy of the proposed procedure and the computational gain are tested with the
aid of numerical examples
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