ansys李辉煌Chapter01

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1、Chapter1Introduction

1Chapter1Introduction1.1
CaseStudy:PneumaticallyActuatedPDMSFingers1.2
StructuralMechanics:AQuickReview1.3
FiniteElementMethods:AConceptualIntroduction1.4
FailureCriteriaofMaterials1.5
ReviewChapter1Introduction
Section1.1CaseStudy:PneumaticallyAct

2、uatedPDMSFingers
2Section1.1CaseStudy:PneumaticallyActuatedPDMSFingersProblemDescription[1]Thepneumatic[2]Asinglefingersarepartofafingerisstudiedinsurgicalparallelrobotthiscase.systemremotelycontrolledbyasurgeonthroughtheInternet.Chapter1Introduction
Section1.1CaseStudy:P

3、neumaticallyActuatedPDMSFingers
35[3]4[4]Thestrain-stressGeometryiccurveofthePDMSmodel.elastomerusedin3thiscase.2Stress(MPa)1000.20.40.60.81.0Strain(Dimensionless)[6]Undeformedshape.[5]Asairpressureapplies,thefingerbendsdownward.Chapter1Introduction
Section1.1CaseStudy:P

4、neumaticallyActuatedPDMSFingers
4StaticStructuralSimulations[1]Prepare[4]Setuploadsmaterialandsupports.properties.[2]Create[5]Solvethegeometricmodel.model.[3]Generatefinite[6]Viewtheelementmesh.results.Chapter1Introduction
Section1.1CaseStudy:PneumaticallyActuatedPDMSFin

5、gers
5[8]Strains.[7]Displacements.Chapter1Introduction
Section1.1CaseStudy:PneumaticallyActuatedPDMSFingers
6BucklingandStress-Stiffening•Stress-stiffening:bendingstiffnessincreaseswithincreasingaxialtensilestress,e.g.,guitarstring.•Theoppositealsoholds:bendingstiffness

6、decreaseswithincreasingaxialcompressivestress.•Buckling:phenomenonwhenbendingstiffnessreducestozero,i.e.,thestructureisunstable.Usuallyoccursinslendercolumns,thinwalls,etc.•Purposeofabucklinganalysisistofindbucklingloadsandbucklingmodes.[2]Theuppersurfacewouldundergocomp

7、ressivestress.Itinturnreducesthebendingstiffness.[1]Ifweapplyanupwardforcehere...Chapter1Introduction
Section1.1CaseStudy:PneumaticallyActuatedPDMSFingers
7DynamicSimulations•Whenthebodiesmoveanddeformveryfast,inertiaeffectanddampingeffectmustbeconsidered.•Whenincluding

8、thesedynamiceffects,itiscalledadynamicsimulation.Chapter1Introduction
Section1.1CaseStudy:PneumaticallyActuate