血管支架疲劳寿命分析_张艺浩

43120113JOURNALOFHARBININSTITUTEOFTECHNOLOGYVol.43Sup．1Mar．2011116024/AN-SYS、．304S－N．．0367－623420111－0086－05FatiguelifeanalysisforcardiovascularstentZHANGYi-haoLIHong-xiaWANGXi-chengDepartmentofEngineeringMechanicsStateKeyLaboratoryofStructuralAnalysisforIndustrialEquipmentDalianUniversityofTechnologyDalian116024AbstractToachievefatiguelifeanalysisforcardiovascularstentweestablishedthearterialwall/bloodcou-pledmodelusingANSYSfiniteelementanalysissoftwaretosimulatethehemodynamicsofthestentimplantedvascular．Weachievedthecouplingcalculationbetweenstructuralanalysisandfluidanalysisandobtainedthenumericalresultsofthecouplingprocessintheconditionofthesineflow．Basedontheresultsofthefluid-structureinteractionandtheS-Ncurveofthe304stainlesssteelinhighcyclefatigueweobtainedthefatiguelifeforthestent．Theresultsofthesimulationshowthatflowproducesperiodicstressonthestentandtheperi-odicstresshaseffectonthefatiguelifeforthestent．Keywordsstentfiniteelementanalysisfluid-structureinteractionfatiguelife“”No．10772042“863”7150080050．．、、．．．－．．．．．．．．/．11.1．．/．1、2．ANSYS．1.21．0.12mm2.51mm2.35mmβ－0.58mm0.08mm．1304bi－linear、1050kg/m3、4×10－3Pa·s．1．1304、、、C10=0.10688e－2C01=0.0710918e－2193GPa0.00219GPa0.00175GPa0.4950.270.4990.499kg/mm31.07E－67.86E－060.207GPa0.692GPa3.54mm4.7mm2．、、3．216ν=0.1125+0.1125sin2*π*Tm/s1Hz0Pa170m/s18．、·78·1．（a）流体动力学分析模型（b）血液（c）支架、血管和斑块图3流体动力学分析模型图2扩张后的血管和支架33.140Pa．．0.225m/s5．4MPa5MPa60.0126mm．4.7mm．7．0.225m/s8．．．．．6m7Mpa8Mpa3.2Von－Mises95．·88·43．9Von－MisesGPa7410．1010242Von－Mises11Von－Mises．．3.8102．1142Von－MisesGpa229.836×10826．10．53.8．．2面号1234567节点号190461987729313284821893629084293091896920313198992974929324191321918928634285689567819638967385897849309493961010441839888应力幅（MPa）9.62789.63189.62069.628916.87116.87316.90516.9117.63827.63737.63697.63514.16974.16884.16824.16813.67963.67883.67863.67843.1513.1543.1583.1593.4243.4223.4193.417累计损伤率36.586%36.593%36.571%36.589%38.539%38.541%38.563%38.571%29.025%29.018%29.013%29.005%15.845%15.841%15.838%15.837%13.982%13.980%13.979%13.975%11.974%11.978%11.981%11.983%13.013%13.011%13.008%13.005%疲劳寿命（次）1.039e91.022e91.048e91.033e99.860e89.860e89.830e89.800e81.309e91.317e91.325e91.331e92.398e92.403e92.410e92.411e92.718e92.721e92.723e92.725e93.174e93.171e93.168e93.163e92.921e92.923e92.927e92.931e9平均寿命（次）1.036e99.836e81.321e92.406e92.722e93.169e92.926e94．·98·1．1．2Von－Mises．33.81038.571%26．．．1．M．1994．2．J．200223338－341．4．J．20014357－359．5．J．20084398－401．6．J．2007284592－598．7．C．2002．8．J．2006275387－388．9．J．200514192－95．10．J．200235515－18．11．35J．2008326516－517．．12．J．200521265－66．13．J．20028273－77．14．M．1987712－713．15AbdulIBarakatETinaChen．Numericalsimulationoffluidmechanicaldisturbanceinducedbyintravascu-larstentsJ．InternationalConferenceonMechanicsinMedicineandBiology20004634－635．16JohnFLadisaDavidCWaritierIsmailGularetal．Stentgeometryanddeploymentratioinfluencedistri-butionsofwallshearstressC．2003SummerBioen-gineeringConference20036843－845．17ReimersSMoussaLAkiyamaTetal．Long-termclinicalfollow-upaftersuccessfulrepeatpercutaneousinterventionforstentrestenosisJ．JAmCollCardi-al1997301186－192．18C．Lallyetal．CardiovascularstentdesignandvesselstressesafiniteelementanalysisJJournalofBio-mechanics20053841574－1581．19AngelaTortorielloetal．Flow-tissueinteractionwithcompliancemismatchinamodelstentedarteryJJournalofBiomechanics20043731－11．20IrinaSurovtsovaEffectsofcompliancemismatchonbloodflowinanarterywithendovascularprosthesisJournalofBiomechanics20053822078－2086．·09·43