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Periodic displacement loads decompose with 4 load steps in Abaqus

Submitted by Xinlei_Wu on
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Periodic displacement loads
ABAQUS
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 I want to simulate a dynamic motion of a pipe under periodic displacement loads.

The whole periodic displacement loads was decomposed into 2 halves. The first half was from 0 at initial configuration to a middle configuration to final configuration, then the second half goes back from final configuration to middle configuration, to initial configuration (Fig.1). The displacement loads of these 4 configurations was given. Using Abaqus Explicit, the whole dynamic motion was simulated.

But, I find a problem as follow.

 

Dynamics of terraces on a silicon surface due to the combined action of strain and electric current

Submitted by Wei Hong on
research
suo group research
strain
Wei Hong
Zhenyu Zhang
electromigration
silicon
step

A (001) surface of silicon consists of terraces of two variants, which have an identical atomic structure, except for a 90° rotation. We formulate a model to evolve the terraces under the combined action of electric current and applied strain. The electric current motivates adatoms to diffuse by a wind force, while the applied strain motivates adatoms to diffuse by changing the concentration of adatoms in equilibrium with each step. To promote one variant of terraces over the other, the wind force acts on the anisotropy in diffusivity, and the applied strain acts on the anisotropy in surface stress. Our model reproduces experimental observations of stationary states, in which the relative width of the two variants becomes independent of time. Our model also predicts a new instability, in which a small change in experimental variables (e.g., the applied strain and the electric current) may cause a large change in the relative width of the two variants.

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