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Add correction factors for pressure-based Green function #90

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merged 4 commits into from
Jan 18, 2024
Merged

Add correction factors for pressure-based Green function #90

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023f4ac
Add pressure based green function correction factors
RShaw026 Jan 18, 2024
3b0ced5
Add documentation and use const for the shape factors
RShaw026 Jan 18, 2024
144f1ed
Use std::map for shape factors
RShaw026 Jan 18, 2024
1c476fc
Update documentation
RShaw026 Jan 18, 2024
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12 changes: 6 additions & 6 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,9 +20,9 @@ int main(int argc, char* argv[])

bool WarmStartingFlag = false;
int Resolution = 0;
double nu1 = 0.0, nu2 = 0.0, CompositeYoungs = 0.0, CompositePoissonsRatio = 0.0, alpha = 0.0,
ElasticComplianceCorrection = 0.0, GridSize = 0.0, Tolerance = 0.0, E1 = 0.0, E2 = 0.0,
LateralLength = 0.0, Delta = 0.0;
double nu1 = 0.0, nu2 = 0.0, CompositeYoungs = 0.0, CompositePoissonsRatio = 0.0,
ShapeFactor = 0.0, ElasticComplianceCorrection = 0.0, GridSize = 0.0, Tolerance = 0.0,
E1 = 0.0, E2 = 0.0, LateralLength = 0.0, Delta = 0.0;
bool RandomTopologyFlag = false;
bool RandomSeedFlag = false;
double Hurst = 0.0;
Expand All @@ -33,9 +33,9 @@ int main(int argc, char* argv[])
bool PressureGreenFunFlag = false;

MIRCO::SetParameters(E1, E2, LateralLength, nu1, nu2, CompositeYoungs, CompositePoissonsRatio,
alpha, ElasticComplianceCorrection, GridSize, Tolerance, Delta, TopologyFilePath, Resolution,
InitialTopologyStdDeviation, inputFileName, RandomTopologyFlag, Hurst, RandomSeedFlag,
RandomGeneratorSeed, WarmStartingFlag, MaxIteration, PressureGreenFunFlag);
ShapeFactor, ElasticComplianceCorrection, GridSize, Tolerance, Delta, TopologyFilePath,
Resolution, InitialTopologyStdDeviation, inputFileName, RandomTopologyFlag, Hurst,
RandomSeedFlag, RandomGeneratorSeed, WarmStartingFlag, MaxIteration, PressureGreenFunFlag);

// Identical Vectors/Matricies, therefore only created one here.
int ngrid = int(ceil((LateralLength - (GridSize / 2)) / GridSize));
Expand Down
39 changes: 32 additions & 7 deletions src/mirco_setparameters.cpp
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Expand Up @@ -4,13 +4,14 @@
#include <Teuchos_ParameterList.hpp>
#include <Teuchos_RCP.hpp>
#include <Teuchos_XMLParameterListHelpers.hpp>
#include <map>
#include <string>
#include <vector>

#include "mirco_filesystem_utils.h"

void MIRCO::SetParameters(double& E1, double& E2, double& LateralLength, double& nu1, double& nu2,
double& CompositeYoungs, double& CompositePoissonsRatio, double& alpha,
double& CompositeYoungs, double& CompositePoissonsRatio, double& ShapeFactor,
double& ElasticComplianceCorrection, double& GridSize, double& Tolerance, double& Delta,
std::string& TopologyFilePath, int& Resolution, double& InitialTopologyStdDeviation,
const std::string& inputFileName, bool& RandomTopologyFlag, double& Hurst, bool& RandomSeedFlag,
Expand Down Expand Up @@ -51,10 +52,25 @@ void MIRCO::SetParameters(double& E1, double& E2, double& LateralLength, double&
// Composite Poisson's ratio
CompositePoissonsRatio = CompositeYoungs / (2 * CompositeShear) - 1;

// Correction factor vector
std::vector<double> alpha_con{0.778958541513360, 0.805513388666376, 0.826126871395416,
0.841369158110513, 0.851733020725652, 0.858342234203154, 0.862368243479785,
0.864741597831785};
// Shape factors (See section 3.3 of https://doi.org/10.1007/s00466-019-01791-3)
// These are the shape factors to calculate the elastic compliance correction of the micro-scale
// contact constitutive law for various resolutions.
// NOTE: Currently MIRCO works for resouluion of 1 to 8. The following map store the shape
// factors for resolution of 1 to 8.
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Alternatively you could use a map here, something like

const std::map<int, double> shape_factors_presure{{1,0.961389237917602},{2,0.924715342432435},...};

Then you can access the data with shape_factors_pressure[Resolution] instead of shape_factors_pressure[Resolution - 1], i.e., you map a resolution value to a pressure.

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I like the map proposal. It makes the assignment of resolution to the value very explicit.


// The following pressure based constants are calculated by solving a flat indentor problem using
// the pressure based Green function described in Pohrt and Li (2014).
// http://dx.doi.org/10.1134/s1029959914040109
const std::map<int, double> shape_factors_pressure{{1, 0.961389237917602}, {2, 0.924715342432435},
{3, 0.899837531880697}, {4, 0.884976751041942}, {5, 0.876753783192863},
{6, 0.872397956576882}, {7, 0.871958228537090}, {8, 0.882669916668780}};

// The following force based constants are taken from Table 1 of Bonari et al. (2020).
// https://doi.org/10.1007/s00466-019-01791-3
const std::map<int, double> shape_factors_force{{1, 0.778958541513360}, {2, 0.805513388666376},
{3, 0.826126871395416}, {4, 0.841369158110513}, {5, 0.851733020725652},
{6, 0.858342234203154}, {7, 0.862368243479785}, {8, 0.864741597831785}};


// Setting up the geometrical parameters.
Teuchos::ParameterList& geoParams =
Expand All @@ -66,7 +82,16 @@ void MIRCO::SetParameters(double& E1, double& E2, double& LateralLength, double&
InitialTopologyStdDeviation = geoParams.get<double>("InitialTopologyStdDeviation");
Tolerance = geoParams.get<double>("Tolerance");
Delta = geoParams.get<double>("Delta");
alpha = alpha_con[Resolution - 1];
ElasticComplianceCorrection = LateralLength * CompositeYoungs / alpha;

if (PressureGreenFunFlag)
{
ShapeFactor = shape_factors_pressure.at(Resolution);
}
else
{
ShapeFactor = shape_factors_force.at(Resolution);
}

ElasticComplianceCorrection = LateralLength * CompositeYoungs / ShapeFactor;
GridSize = LateralLength / (pow(2, Resolution) + 1);
}