evaluateStress

Evaluate stress for dynamic structural analysis problem

Syntax

nodalStress = evaluateStress(structuralresults)

Description

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

Examples

Stress for 3-D Structural Dynamic Problem

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)

Specify the Young's modulus, Poisson's ratio, and 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

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

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.