Advances in Mechanics of High-Temperature Materials (eBook)

Konstantin Naumenko, Manja Krüger (Herausgeber)

eBook Download: PDF

2019
211 Seiten
Springer International Publishing (Verlag)
978-3-030-23869-8 (ISBN)

Infos

This book presents a collection of contributions on advanced approaches to the mechanics of materials and mechanics of structures for high-temperature applications, such as power plant components, engines and turbochargers. The contributions highlight advanced constitutive models for high-temperature materials, as well as new approaches to the efficient modeling and analysis of engineering structures operating in high-temperature environments.

Inhalt

Preface 6
Contents 8
Analysis of a Power Plant Rotor Made of Tempered Martensitic Steel Based on a Composite Model of Inelastic Deformation 10
1 Introduction 11
2 Phase Mixture Model 15
2.1 Microscopic Model 15
2.2 Macroscopic Model 19
3 Implementation into the Finite Element Method 24
3.1 Stress Update Algorithm 24
3.2 Consistent Tangent Operator 29
4 Analysis of an Idealized Rotor 31
4.1 Heat Transfer Analysis 32
4.2 Structural Analysis 34
5 Summary and Outlook 38
References 40
Computational Assessment of the Microstructure-Dependent Thermomechanical Behaviour of AlSi12CuNiMg-T7—Methods and Microstructure-Based Finite Element Analyses 44
1 Introduction 45
2 Microstructure and Material Characterization 46
3 Microstructure-Based Cell Model for FE Analysis 49
3.1 Numerical Homogenization Method for the Computation of Macroscopic Quantities 49
3.2 Digitization of the Microstructure 50
3.3 Reconstruction of the FE Model 51
3.4 Determination and Validation of Microstructure-Dependent Linear-Elastic, Viscoplastic and Thermal Material Properties 51
4 Microstructure-Dependent Anisotropic Elastic Material Behavior 55
5 Microstructure-Dependent Thermal FE Analyses 58
6 Summary and Conclusions 62
References 63
Problems of Thick Functionally Graded Material Structures Under Thermomechanical Loadings 66
1 Introduction 66
2 Technological and Numerical Problems of FGM's 68
3 Conditions of Plane Stress State 69
3.1 Classical Thermo-Elastic Continuum 69
3.2 Quasi-micro-polar Continuum 72
3.3 Example—Thick Plate Made of FGM Al/ZrO2 + Y2O3 73
4 Conditions of Stress Free Deformation 76
5 FGM Cylinder 78
5.1 Governing Equations 78
5.2 Example 79
6 Concept of FGM Axisymmetric Finite Element 81
6.1 Formulation of FGM Thermo-Elastic Cylinder 81
6.2 FEM Formulation 82
6.3 Examples 83
7 Conclusions 85
References 85
Structural Analysis of Gas Turbine Blades Made of Mo-Si-B Under Stationary Thermo-Mechanical Loads 88
1 Introduction 88
2 Requirements for Gas Turbine Blade Materials 89
3 Methods and Computational Details 92
3.1 Materials 92
4 Results 94
5 Conclusions 98
References 99
Effects of Second Phases in Mo-Zr Alloys-A Study on Phase Evolution and Mechanical Properties 101
1 Introduction 101
2 Effect of Zr in Mo-Based Alloys 102
3 Materials and Methods 104
4 Results and Discussion 105
4.1 Microstructures 105
4.2 Microhardness 109
4.3 Uniaxial Compression Tests 110
5 Conclusions 111
References 112
Investigating the Effect of Creep Properties Mismatch in Very Thin Pipes Within High-Temperature Facilities 114
1 Introduction 115
2 Cyclic Response of Structures at Elevated and High-Temperature 118
3 Numerical Model 120
4 Results 122
4.1 Bree Like Diagram for Non-carburised Cylinder 122
4.2 Creep-Fatigue Analyses of the Non-carburiesed Cylinder 123
4.3 Creep-Fatigue Analyses of a Cylinder with Carburised Layer 125
5 Conclusion 132
References 137
Cohesive Zone Models—Theory, Numerics and Usage in High-Temperature Applications to Describe Cracking and Delamination 138
1 Introduction 138
2 Preliminaries and Notation 139
3 Basics of a Cohesive Zone Model and the Traction-Separation-Law 140
3.1 The Cohesive Zone Model 140
3.2 The Traction-Separation-Law 142
4 Development of the Novel Traction-Separation-Law for High-Temperature Applications 143
4.1 Equations of Balance for an Arbitrary Body with a Thin Interface 143
4.2 The Novel Traction-Separation-Law 147
4.3 Heat Transfer Through an Arbitrary Body with a Thin Interface 150
5 Numerics of Cohesive Zone Models and the Novel Traction-Separation-Law 153
5.1 Deriving Basic FEM Equations 153
5.2 Discretisation of the Variational Statements of the Interface 155
5.3 Deriving the Cohesive Element Stiffness Matrix 157
5.4 2D Cohesive Element Formulation 160
5.5 Algorithm to Solve the Novel Traction-Separation-Law 161
5.6 Numerical Problems Arising Through the Use of Cohesive Elements 163
6 Application of the Cohesive Zone Model to Describe Cracking and Delamination of a Coating at High-Temperature 165
6.1 Experimental Setup and Numerical Model 165
6.2 Determination of the CZM Parameters by Numerical Optimisation 168
6.3 Comparison Between Experiment and Simulation 170
7 Summary and Outlook 172
References 173
Stability of Parameter Identification Using Experiments with a Heterogeneous Stress State 176
1 Introduction 176
2 Material Model 177
3 Synthetic Experimental Data 181
4 Identification Strategies and Optimization Results 182
5 Mechanics-Based Metric 183
6 Analysis of Stability with Respect to Measurement Errors 185
7 Discussion and Conclusion 186
References 186
Short Term Transversally Isotropic Creep of Plates Under Static and Periodic Loading 188
1 Motivation 188
2 Problem Statement and Method of Solution 190
3 Numerical Solution 194
4 Short-Term Creep of Uniaxial Specimens 197
5 Short-Term Creep of Plates with Holes. Experimental Investigations 205
6 Short-Term Creep of Plates with Holes. Numerical Simulation 210
7 Conclusions 217
References 217

Produkt-Details

• Erscheint lt. Verlag: 9.7.2019
• Reihe/Serie: Advanced Structured Materials
• Reihe/Serie: Advanced Structured Materials
• Zusatzinfo: VIII, 211 p. 146 illus., 64 illus. in color.
• Sprache: englisch
• Themenwelt: Technik ► Maschinenbau
• Schlagworte: constitutive model • creep and plasticity • damage mechanics • fracture mechanics • inelastic behavior • Structural Analysis
• ISBN-10: 3-030-23869-5 / 3030238695
• ISBN-13: 978-3-030-23869-8 / 9783030238698