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发表于 2009-7-7 09:55:30
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来自 LAN
XFEM Current Limitations from SIMULIA material.
• Implemented only for the static stress analysis procedure
• Can use only linear continuum elements
• CPE4, CPS4, C3D4, C3D8 and their reduced integration/incompatible
counterparts
• Element processing is not done in parallel
• On SMP machines, only the solver runs in parallel
• Cannot run in parallel on DMP machines
• Contour integrals for stationary cracks not currently supported
• Cannot model fatigue crack growth
• Intended for single or a few non-interacting cracks in the structure
• Shattering cannot be modeled
• An element cannot be cut by more than one crack
• Crack cannot turn more than 90 degrees in one increment
• Crack cannot branch
• The first signed distance function Φ must be non-zero
• If the crack lies along an element boundary, a small positive or negative
value should be used
• This slightly offsets the crack from the element boundary
• Only frictionless small-sliding contact is considered
• The small-sliding assumption will result in nonphysical contact behavior
if the relative sliding between the contacting surfaces is indeed large
• Only enriched regions can have a material model with damage
• If only a portion of the model needs to be enriched define an extra
material model with no damage for the regions not enriched
• Probing field quantities on an element currently returns values only
from the “lower” element (corresponding to negative values of Φ) |
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