Carbon Fibre Reinforced Composites for the Tuning Structure of LHC RF Cavaties
- Art: Diplomarbeit
- Autor: Gero Pflanz
- Abgabedatum: Mai 1997
- Umfang: 124 Seiten
- Dateigröße: 19,0 MB
- Note: 1,0
- Institution / Hochschule: Technische Universität Carolo-Wilhelmina zu Braunschweig Deutschland
- ISBN (eBook): 978-3-8324-0097-2
-
ISBN (Paperback) :
978-3-8324-0097-2 P - ISBN (CD) :978-3-8324-0097-2 CD
- Sprache: Englisch
- Prämierung:
- Arbeit zitieren: Pflanz, Gero Mai 1997: Carbon Fibre Reinforced Composites for the Tuning Structure of LHC RF Cavaties, Hamburg: Diplomica Verlag
- Schlagworte: CFK für Teilchenbeschleuniger, Faserverstärkte Kunststoffe, Niedrigtemperaturanwendungen, SC Cavities, Thermische Spannungen in CFK
In den Warenkorb
38,00 €
Diplomarbeit von Gero Pflanz
Abstract:
The suitability of different materials for the tuning structure of the LHC rf cavities is evaluated. The structure spanning the temperature interval from room to cryogenic is subjected to mechanical loading, and radiation.
A filament wound tube reinforced with high-strength carbon fibres is considered to be most appropriate.
Design calculations are performed using laminate theory. The safety margin for a cylindric filament wound tube under the given mechanical and thermal loading conditions is calculated for different winding angles.
The calculations indicate that the thermal load is causing shear and transverse stresses which are more critical than the stresses due to the mechanical load.
A fatigue test is performed with a prototype tube under thermal and mechanical working conditions as they are estimated for LHC.
Before and after the fatigue test, non-destructive testing methods (ultrasonic examination, microscopy, and geometry measurements) are employed to evaluate the material condition before and after the fatigue test.
All three non-destructive tests indicate that the prototype tube withstood the fatigue test damage free. No advice on fibre breakage, delaminations, or matrix micro-cracking has been found.
Table of Contents:
| 1. | Introduction | 1 |
| 2. | Background | 3 |
| 2.1 | CERN | 3 |
| 2.2 | CERN's Future Project LHC | 4 |
| 2.3 | RF Cavities | 5 |
| 2.4 | Tuning of Cavities | 7 |
| 3. | Material and Geometry | 11 |
| 3.1 | Mechanical Load, Life Expectancy | 12 |
| 3.2 | Thermal Load | 13 |
| 3.3 | Radiation Resistance | 13 |
| 3.4 | Choice of Material | 14 |
| 3.5 | Choice of Structure | 17 |
| 4. | Design Calculations | 21 |
| 4.1 | Mechanics of Fibre-Reinforced Composites | 21 |
| 4.2 | Calculation of Stresses and Strains | 23 |
| 4.2.1 | Temperature Distribution | 23 |
| 4.2.2 | Stresses and Strains | 26 |
| 4.3 | Failure Analysis | 34 |
| 5. | Testing Methods | 37 |
| 5.1 | Destructive. | 37 |
| 5.1.1 | Tensile Properties | 37 |
| 5.1.2 | In-Plane Shear Properties | 38 |
| 5.2 | Non-Destructive Testing | 38 |
| 5.2.1 | Ultrasonic Testing | 39 |
| 5.2.2 | Radiography | 43 |
| 5.2.3 | Acoustic-Emission | 44 |
| 5.2.4 | Acousto-Ultrasonic Testing | 45 |
| 5.2.5 | Thermography | 46 |
| 5.2.6 | Other Methods | 47 |
| 6. | Testing | 49 |
| 6.1 | Non-Destructive Material Tests | 49 |
| 6.1.1 | Microscopy of End-Sections | 50 |
| 6.1.2 | Geometry | 50 |
| 6.1.3 | Ultrasonic Testing | 51 |
| 6.2 | Description of Fatigue Test | 53 |
| 6.2.1 | Test Assembly | 53 |
| 6.2.2 | Testing Procedure | 55 |
| 6.3 | Results and Discussion | 57 |
| 6.3.1 | Fatigue Test | 57 |
| 6.3.2 | Microscopy of End-Sections | 57 |
| 6.3.3 | Geometry | 58 |
| 6.3.4 | Ultrasonic Test | 59 |
| 7. | Conclusions | 65 |
| Bibliography | 67 | |
| A. | Initial Specification of the Diplomarbeit | 75 |
| B. | Introduction to Accelerators | 79 |
| B.1 | Introduction to Accelerator Physies | 79 |
| B.2 | Development of Particle Accelerators | 81 |
| B.2.1 | Direct Current Accelerators | 81 |
| B.2.2 | Radio Frequency Accelerators | 81 |
| B.3 | Synchrotrons, Storage Rings, and Colliders | 83 |
| C. | Prototype Tube | 85 |
| C.1 | Ply-Properties | 85 |
| C.1.1 | Coefficients of Elasticity | 85 |
| C.1.2 | Coefficients of Thermal expansion | 86 |
| C.1.3 | Ply-Strength | 86 |
| D. | Program Codes and Results | 87 |
| D.1 | Temperature Distribution | 87 |
| D.1.1 | Curve Fit, Thermal Conductivity | 87 |
| D.1.2 | Iterative Solution of D.E. of Conduction of Heat | 89 |
| D.1.3 | Curve-Fit to Solution | 94 |
| D.2 | Ply Stresses and Strains | 95 |
| D.2.1 | Program Code | 95 |
| E. | Testing Results | 109 |
| E.1 | Results of Micrography | 109 |
| E.2 | Results of Ultrasonic Test at EMPA | 114 |
| E.2.1 | Ultrasonic Test at EMPA | 114 |
In den Warenkorb
38,00 €
Link zur Arbeit:
http://www.diplom.de/ean/9783832400972
Arbeit zitieren:
Pflanz, Gero Mai 1997: Carbon Fibre Reinforced Composites for the Tuning Structure of LHC RF Cavaties, Hamburg: Diplomica Verlag
Schlagworte:
CFK für Teilchenbeschleuniger, Faserverstärkte Kunststoffe, Niedrigtemperaturanwendungen, SC Cavities, Thermische Spannungen in CFK
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