evaluateStress

Evaluate stress for dynamic structural analysis problem

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Syntax

nodalStress = evaluateStress(structuralresults)

Description

example

nodalStress = evaluateStress(structuralresults) evaluates stress at nodal locations for all time- or frequency-steps.

Examples

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Stress for 3-D Structural Dynamic Problem

Open Live Script

Evaluate the stress in a beam under a harmonic excitation.

Create a transient dynamic model for a 3-D problem.

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

Create the geometry and include it in the model. Plot the geometry.

gm = multicuboid(0.06,0.005,0.01);
structuralmodel.Geometry = gm;
pdegplot(structuralmodel,"FaceLabels","on","FaceAlpha",0.5)
view(50,20)

Figure contains an axes object. The axes object contains 3 objects of type quiver, patch, line.

Specify Young's modulus, Poisson's ratio, and the mass density of the material.

structuralProperties(structuralmodel,"YoungsModulus",210E9, ...
                                     "PoissonsRatio",0.3, ...
                                     "MassDensity",7800);

Fix one end of the beam.

structuralBC(structuralmodel,"Face",5,"Constraint","fixed");

Apply a sinusoidal displacement along the y-direction on the end opposite the fixed end of the beam.

structuralBC(structuralmodel,"Face",3, ...
                             "YDisplacement",1E-4, ...
                             "Frequency",50);

Generate a mesh.

generateMesh(structuralmodel,"Hmax",0.01);

Specify the zero initial displacement and velocity.

structuralIC(structuralmodel,"Displacement",[0,0,0],"Velocity",[0,0,0]);

Solve the model.

tlist = 0:0.002:0.2;
structuralresults = solve(structuralmodel,tlist);

Evaluate stress in the beam.

stress = evaluateStress(structuralresults);

Plot the normal stress along x-direction for the last time-step.

figure
pdeplot3D(structuralmodel,"ColorMapData",stress.sxx(:,end))
title("x-Direction Normal Stress in the Beam of the Last Time-Step")

Input Arguments

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`structuralresults` — Solution of dynamic structural analysis problem
`TransientStructuralResults` object | `FrequencyStructuralResults` object

Solution of a dynamic structural analysis problem, specified as a TransientStructuralResults or FrequencyStructuralResults object. Create structuralresults by using the solve function.

Example: structuralresults = solve(structuralmodel,tlist)

Output Arguments

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`nodalStress` — Stress at nodes
`FEStruct` object

Stress at the nodes, returned as an FEStruct object with the properties representing the components of a stress tensor at nodal locations. Properties of an FEStruct object are read-only.