پروژه با عنوان: تحلیل اتصالات چسبی فلز به کامپوزیت در کاربردهای فضایی

catia2015 — Wed, 3 Aug 2016 12:03:08 GMT

Within the European space programme, a new upper stage engine (Vinci) for the Ariane 5 launcher is being developed, and the Volvo Aero Corporation (VAC) is contributing with tur-bines for the fuel turbopumps. This MSc thesis investigates the possibility of designing the Turbine Exhaust Duct (TED) of the Vinci-engine in a carbon fibre composite material with adhesively attached titanium flanges. The focus of the project has been on stress analyses of the adhesive joints using Finite Element Methods (FEM), more specifically by using a cohe-sive zone material (CZM) to model the adhesive layer. Analysing adhesive joints is complex and an important part of the work has been to develop and concretise analysis methods for future use within VAC
To obtain the specialised material parameters needed for a CZM analysis, FE-models of ten-sile test specimens were analysed and the results compared to those of equivalent experimen-tal tensile tests. These parameters were then used when analysing the TED geometry with load cases specified to simulate the actual operation conditions of the Vinci engine. Both two-dimensional axisymmetric and fully three-dimensional models were analysed and, addition-ally, a study was performed to evaluate the effect of cryogenic temperatures on the strength of the joint
The results show that the applied thermal and structural loading causes local stress concentra-tions on the adhesive surface, but the stresses are not high enough to cause damage to the joint if a suitable joint design is used. Cryogenic temperatures (-150 °C) caused a significant strength reduction in the tensile specimens, partially through altered adhesive properties, but no such severe effects were seen in the temperature-dependent FE-analyses of the TED. It should be pointed out however, that some uncertainties about the material parameters exist, since these were obtained in a rather unconventional way. There are also several other impor-tant questions, beside the strength of the adhesive joint, that need to be answered before a metal-composite TED can be realised.

پروژه تحلیل اتصالات چسبی فلز به کامپوزیت در کاربردهای فضایی (Analysis of Metal to Composite Adhesive Joints in Space Applications)، مشتمل بر 7 فصل، 115 صفحه، به زبان انگلیسی، تایپ شده، به همراه تصاویر، با فرمت pdf به ترتیب زیر گردآوری شده است:

Chapter 1: PROJECT BACKGROUND

Volvo Aero CorporationThe Vinci Engine ProjectThe Turbine Exhaust DuctThe KOMET Research ProjectThesis Project Specifications

Chapter 2: THEORETIC BACKGROUND

Adhesive Joint TheoryAnalytical methodsNumerical Analysis in Solid MechanicsIntroduction to Elastic FEAThermal FEAThermoelastic couplingCohesive Zone Material ModellingBasic Concepts of Fracture MechanicsThe Cohesive Zone ModelCZM in ANSYS

Chapter 3: ANALYSIS METHODS

Obtaining CZM Material ParametersSpecimen modelling Testing Procedure 2D-axisymmetric TED Analysis Simplified Geometry from Preliminary StudySetup of the Finite Element Analysis Material Data Joint Geometry Concepts Three-Dimensional TED Analysis Load Extraction 3D Modelling Sub modellingAnalysis of Cryogenic Properties Estimation of Cryogenic Material Parameters

Chapter 4: RESULTS

Obtaining Material ParametersDOE 1 – Material Parameters DOE 2 – Modelling ParametersTypical Adhesive Stress DistributionFinal Parameters Resulting From the DOE Tests3D Validation ModelAxisymmetric TED AnalysisPreliminary Geometry – 40 mm Straight OverlapStraight End – 25 mm overlapEmbedded Straight End GeometryShort Tapered End GeometryFully Tapered End Geometry3D TED analysisStatic Structural AnalysisCoarse Model Transient AnalysisSubmodel Result PlotsCryogenic Properties Analysis

Chapter 5: DISCUSSION

Analysis of Tensile Test SpecimensComparison of FEA and Screening Test ResultsConclusions of the DOEAnalysis of the TED Inlet FlangeSeparate Load AnalysisAnalysis of New Geometry ConceptsAnalysis of the 3D Flange ModelAnalysis of Cryogenic PropertiesPotential Weight Savings

Chapter 6: CONCLUSIONS

CZM Analysis of Adhesive JointsReview of the Analysis ProcedureFeasibility of a CFRP/Metal TED DesignFurther Research Options

Chapter 7: REFERENCES

APPENDIX

Cross section of the Vinci hydrogen turbo-pumpFlow chart of the Vinci engine (only lower stages shown)ANSYS Code Sample – Tensile Test Specimen AnalysisANSYS Code Sample – 2D Axisymmetric AnalysisANSYS Code Sample – 3D Submodel Analysis

جهت دانلود پروژه تحلیل اتصالات چسبی فلز به کامپوزیت در کاربردهای فضایی (Analysis of Metal to Composite Adhesive Joints in Space Applications)، بر لینک زیر کلیک نمایید:

پروژه با عنوان: تحلیل اتصالات چسبی فلز به کامپوزیت در کاربردهای فضایی

برتر فایل

پروژه با عنوان: تحلیل اتصالات چسبی فلز به کامپوزیت در کاربردهای فضایی