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Commit 84975a57 authored by Elias Pipping's avatar Elias Pipping Committed by Elias Pipping
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Solve a problem that is not soft

parent ed72c55c
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...@@ -17,12 +17,8 @@ enable_timer = false ...@@ -17,12 +17,8 @@ enable_timer = false
refinements = 4 refinements = 4
[body] [body]
E = 2e7 E = 5e7
# "Most steels and rigid polymers when used within their design limits nu = 0.3 # The close we get to 0.5, the more wiggly everything gets
# (before yield) exhibit values of about 0.3"
# -- http://en.wikipedia.org/wiki/Poisson's_ratio
nu = 0.3 # Needs to be strictly below 0.5; the closer we get, the
# tougher the problem. But we do have convergence!
[solver] [solver]
tolerance = 1e-11 tolerance = 1e-11
...@@ -51,31 +47,28 @@ acceptFactor = 1.0 ...@@ -51,31 +47,28 @@ acceptFactor = 1.0
requiredResidual = 1e-12 requiredResidual = 1e-12
[boundary.friction] [boundary.friction]
normalstress = 10000000 normalstress = 50000
# "Most dry materials in combination have friction coefficient values
# between 0.3 and 0.6"
# -- http://en.wikipedia.org/wiki/Friction#Coefficient_of_friction
# "mu_0 is the nominal coefficient of friction that has values near 0.6" # "mu_0 is the nominal coefficient of friction that has values near 0.6"
# -- James H. Dieterich and Brian Kilgore: Implications of fault # -- James H. Dieterich and Brian Kilgore: Implications of fault
# constitutive properties for earthquake prediction # constitutive properties for earthquake prediction
# http://earthquake.usgs.gov/research/physics/lab/prediction.pdf # http://earthquake.usgs.gov/research/physics/lab/prediction.pdf
mu = 0.5 mu = 0.6
eta = 1 eta = 1
model = Exponential model = Exponential
[boundary.friction.state] [boundary.friction.state]
# log(alpha(0)) # log(alpha(0))
initial = -2.23805 initial = 0
model = Dieterich # Ruina model = Dieterich # Ruina
[boundary.friction.ruina] [boundary.friction.ruina]
# "For rocks, typical values of A and B range from 0.005 to 0.015" # "For rocks, typical values of A and B range from 0.005 to 0.015"
# -- Ronaldo I. Borja and Craig D. Foster: # -- Ronaldo I. Borja and Craig D. Foster:
# Continuum mathematical modeling of slip weakening in geological systems # Continuum mathematical modeling of slip weakening in geological systems
a = 0.0075 a = 0.010
b = 0.015 b = 0.015
# If L is too large, reaching a steady state takes too long # If L is too large, reaching a steady state takes too long
L = 1e-3 L = 1e-5
# The second-order a and b terms in [..] are very important in # The second-order a and b terms in [..] are very important in
# determining whether sliding is stable or unstable and (in appli- # determining whether sliding is stable or unstable and (in appli-
......
...@@ -13,7 +13,7 @@ class neumannCondition: ...@@ -13,7 +13,7 @@ class neumannCondition:
class dirichletCondition: class dirichletCondition:
def __call__(self, x): def __call__(self, x):
return 2 return .005
# return 0 # return 0
fst = 3e-1 fst = 3e-1
snd = 5e-1 snd = 5e-1
......
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