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Specific Search Results Below:
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User-Defined Creep Laws with USERCREEP [ZIP]
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Sheldon Imaoka (ANSYS, Inc.)
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"ANSYS provides 13 creep equations for use with implicit creep – these range from
the simple Norton law to the hyperbolic sine form to the Blackburn model to a rational
polynomial expression, to name a few – that can be used to model a range of creep
behavior for metals. The TBFT command provides curve-fitting functionality for the user
wishing to evaluate creep material parameters from test data. Also, the user can model
anisotropic creep as well as combine implicit creep with rate-independent plasticity to
model a wide range of complex material response.
Despite this wealth of features, however, one may wish to incorporate one’s own
creep law into ANSYS. For example, a company may have their own creep equation
with material parameters already defined and validated through testing. The built-in
creep laws in ANSYS assume creep used in design rather than failure analysis, so the
available creep laws are meant to model primary and secondary creep – consequently,
another need to incorporate a user-defined creep law would arise when a user wants to
include tertiary creep and/or to evaluate creep damage.
This memo will hope to address some aspects of writing one’s own user-defined
creep law with the USERCREEP.F subroutine to address this issue."
Example using Anand's model.
(Week 40, week of 10/07/07)
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Average Rating: 9.6 (14 votes)
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