# findStructuralProperties

Find structural material properties assigned to geometric region

## Description

example

smpa = findStructuralProperties(materialProperties,RegionType,RegionID) returns the structural material properties assigned to the specified region. Structural properties include Young's modulus, Poisson's ratio, the mass density, the coefficient of thermal expansion, and the hysteretic damping parameter of the material.

## Examples

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Find Young's modulus and Poisson's ratio for cells of a 3-D geometry.

Create a structural model.

structuralmodel = createpde("structural","static-solid");

Create the geometry consisting of three stacked cylinders and include it in the model. Plot the geometry.

gm = multicylinder(10,[1 2 3],"ZOffset",[0 1 3]);
structuralmodel.Geometry = gm;
pdegplot(structuralmodel,"CellLabels","on","FaceAlpha",0.5)

Assign different values of Young's modulus and Poisson's ratio to each cell.

structuralProperties(structuralmodel,"Cell",1,"YoungsModulus",200E9, ...
"PoissonsRatio",0.3);
structuralProperties(structuralmodel,"Cell",2,"YoungsModulus",210E9, ...
"PoissonsRatio",0.3);
structuralProperties(structuralmodel,"Cell",3,"YoungsModulus",110E9, ...
"PoissonsRatio",0.35);

Check the structural properties specification for cell 1.

mC1 = findStructuralProperties(structuralmodel.MaterialProperties, ...
"Cell",1)
mC1 =
StructuralMaterialAssignment with properties:

RegionType: 'Cell'
RegionID: 1
YoungsModulus: 2.0000e+11
PoissonsRatio: 0.3000
MassDensity: []
CTE: []
HystereticDamping: []

Check the structural properties specification for cells 2 and 3.

mC23 = findStructuralProperties(structuralmodel.MaterialProperties, ...
"Cell",[2,3]);
mC2 = mC23(1)
mC2 =
StructuralMaterialAssignment with properties:

RegionType: 'Cell'
RegionID: 2
YoungsModulus: 2.1000e+11
PoissonsRatio: 0.3000
MassDensity: []
CTE: []
HystereticDamping: []

mC3 = mC23(2)
mC3 =
StructuralMaterialAssignment with properties:

RegionType: 'Cell'
RegionID: 3
YoungsModulus: 1.1000e+11
PoissonsRatio: 0.3500
MassDensity: []
CTE: []
HystereticDamping: []

## Input Arguments

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Material properties of the model, specified as the MaterialProperties property of a StructuralModel object.

Example: structuralmodel.MaterialProperties

Geometric region type, specified as "Face" for a 2-D model or "Cell" for a 3-D model.

Example: findStructuralProperties(structuralmodel.MaterialProperties,"Cell",1)

Data Types: char | string

Geometric region ID, specified as a vector of positive integers. Find the region IDs by using pdegplot.

Example: findStructuralProperties(structuralmodel.MaterialProperties,"Face",1:3)

Data Types: double

## Output Arguments

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Material properties assignment, returned as a StructuralMaterialAssignment object. For details, see StructuralMaterialAssignment Properties.

## Version History

Introduced in R2017b