Master's thesis. Predicting the durability of the cylinder head of the forced diesel

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Uploaded: 24.04.2007
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Master's thesis: Forecasting of durability of the cylinder head of the forced diesel engine based on the phenomenon of thermal fatigue + presentation.

Introduction 5
1. Review and analysis of the literature on the problem of thermal fatigue cylinder heads 7
1.1. Types of damage and stress state of the cylinder heads 7
1.1.1. Types of damage cylinder heads 7
1.1.2. Stress state of the cylinder head 9
1.1.3. Foundry voltage 9
1.1.4. Stress Growth 10
1.1.5. Mechanical stress 11
1.1.6. Thermal stresses 12
1.2. Comparative GC teplonapryazhёnnost of cast iron and aluminum alloy 17
1.3. The mechanism of formation of thermal fatigue cracks in the cylinder heads 19
1.4. The physical nature of thermal fatigue 24
1.5. Changes in fatigue structure at room temperature for 24
1.6. Structural changes in the high temperature creep 25
1.7. The mechanism of formation and development of cracks in the thermal fatigue 25
1.8. The chemical composition and properties of the materials used for the manufacture of cylinder heads 30
1.8.1. Iron. Grey cast iron (MF) 30
1.8.2. Compacted graphite iron (CGI) 33
1.8.3. High-strength nodular cast iron. Ductile iron 35
1.8.4. Properties of cast iron at elevated temperatures 35
1.8.5. Heat resistance iron 38
1.8.6. Nature of cracks in cast-iron cylinder heads 42
1.9. Aluminium alloys 45
1.10.Neobratimoe forming alloys under cyclic thermal exposure 59
1.10.1. Rising iron 59
1.10.2. Physical basis of the irreversible forming plastic materials 62
1.11. Thermal fatigue test 65
1.12. Analysis of the assessment work teplonapryazhёnnogo state of the cylinder head 72
1.13. Methods of evaluating the durability of the cylinder head 75
2. Calculation of the sample thermal fatigue 78
2.1. Theoretical basis of calculation 78
2.2. The test images to thermal fatigue endurance 83
2.3. Creating a computational model of the sample 84
2.4. The thermal loading of the sample 86
2.5. Calculation of stresses and strains arising in the sample 88
2.6. Calculation of the durability of the sample 92
3. Determination of thermal fatigue durability of the cylinder head 94
3.1. Creating a model of the bottom plate of the cylinder head 94
3.2. Calculation of thermal field 96
3.3. Calculation of stress-strain state of the model cylinder head using the flow theory 106
3.4. The calculation model of the cylinder head on the thermal fatigue endurance 109
Conclusion 110
List of sources used 111

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