From 97320b481363badde6e9964cfb842fec91d05a10 Mon Sep 17 00:00:00 2001
From: Patrick Jaap <patrick.jaap@tu-dresden.de>
Date: Wed, 9 Feb 2022 10:26:47 +0100
Subject: [PATCH] Fix in mooneyrivlindensity.hh
Square the determinant in the Ciarlet variant
---
dune/elasticity/materials/mooneyrivlindensity.hh | 4 ++--
test/mooneyrivlintest.cc | 8 ++++----
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/dune/elasticity/materials/mooneyrivlindensity.hh b/dune/elasticity/materials/mooneyrivlindensity.hh
index 7317242..2b4c35d 100644
--- a/dune/elasticity/materials/mooneyrivlindensity.hh
+++ b/dune/elasticity/materials/mooneyrivlindensity.hh
@@ -66,7 +66,7 @@ public:
C = F^TF and B = FF^T have the same eigenvalues - we can use either one of them.
There are three Mooney-Rivlin-Variants:
- ciarlet: W(F) = mooneyrivlin_a*(normF)^2 + mooneyrivlin_b*(normFinv)^2*detF + mooneyrivlin_c*(detF)^2 -
+ ciarlet: W(F) = mooneyrivlin_a*(normF)^2 + mooneyrivlin_b*(normFinv)^2*detF^2 + mooneyrivlin_c*(detF)^2 -
((dim-1)*mooneyrivlin_a + mooneyrivlin_b + 2*mooneyrivlin_c)*ln(detF)
log: W(F) = \sum_{i,j=0}^{i+j<=n} mooneyrivlin_ij * (I1 - 3)^i * (I2 - 3)^j + mooneyrivlin_k * ln(det(F))^2
square: W(F) = \sum_{i,j=0}^{i+j<=n} mooneyrivlin_ij * (I1 - 3)^i * (I2 - 3)^j + mooneyrivlin_k * 0.5 * (det(F) - 1)^2
@@ -99,7 +99,7 @@ public:
gradientInverse.invert();
field_type frobeinusNormFInverseSquared = gradientInverse.frobenius_norm2();
using std::log;
- return mooneyrivlin_a*frobeniusNormFsquared + mooneyrivlin_b*frobeinusNormFInverseSquared*detF + mooneyrivlin_c*detF*detF - ((dim-1)*mooneyrivlin_a + mooneyrivlin_b + 2*mooneyrivlin_c)*log(detF);
+ return mooneyrivlin_a*frobeniusNormFsquared + mooneyrivlin_b*frobeinusNormFInverseSquared*detF*detF + mooneyrivlin_c*detF*detF - ((dim-1)*mooneyrivlin_a + mooneyrivlin_b + 2*mooneyrivlin_c)*log(detF);
}
else
{
diff --git a/test/mooneyrivlintest.cc b/test/mooneyrivlintest.cc
index 1134aa6..8af6cba 100644
--- a/test/mooneyrivlintest.cc
+++ b/test/mooneyrivlintest.cc
@@ -167,10 +167,10 @@ int main (int argc, char *argv[])
parameters["mooneyrivlin_a"] = "2.42e+6";
parameters["mooneyrivlin_b"] = "6.52e+6";
parameters["mooneyrivlin_c"] = "-7.34e+6";
- expectedEnergy = 83069427.2;
- expectedGradientTwoNorm = 163210957;
- expectedGradientInfinityNorm = 49284369.2;
- expectedMatrixFrobeniusNorm = 5.92126562e+09;
+ expectedEnergy = 68753239.6;
+ expectedGradientTwoNorm = 31244643.1;
+ expectedGradientInfinityNorm = 9673572.39;
+ expectedMatrixFrobeniusNorm = 1.67660965e+09;
int testCiarlet = assembleAndCompare(basis, parameters, x, expectedEnergy, expectedGradientTwoNorm, expectedGradientInfinityNorm, expectedMatrixFrobeniusNorm);
return testCiarlet + testLog + testSquare;
--
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