Spectral Method in Multiaxial Random Fatigue (eBook)

Preface 6
Contents 8
List of Symbols 10
Introduction 12
Spectral Methods for Fatigue Description 15
2.1 Random Gaussian Loading 15
2.2 Random Non-Gaussian Loads 36
2.3 Multiaxial Loading 39
Theoretical Fundamentals 45
3.1 Description of Random Stress and Strain States 45
3.2 Multiaxial Fatigue Failure Criteria 48
3.3 Power Spectral Density Function of Equivalent History 52
3.4 Amplitude Distribution in Spectral Methods 55
3.5 Spectral Method of Fatigue Life Determination 58
Algorithm of Spectral Method for Evaluation of Fatigue Life 75
4.1 Block 1 – Loading 75
4.2 Block 2 – Determination of Critical Plane Position 76
4.3 Block 3 – Calculation of Power Spectral Density Function of Equivalent Stress or Strain 78
4.4 Block 4 – Statistical Parameters 78
4.5 Block 5 – Calculation of Fatigue Life 78
Simulations 80
5.1 Algorithm, Assumptions and Objectives of Simulations 80
5.2 Input Quantities 82
5.3 Analysis of Positions of Critical Planes 90
5.4 Analysis of Equivalent Quantities 109
5.5 Analysis of Fatigue Life 111
Experimental Studies 120
6.1 Test Stands 120
6.2 Material and Geometry of Tested Specimens 124
6.3 Testing under Narrow-Band Frequency Loading 125
6.4 Testing under Broad-Band Frequency Loading 126
6.5 Comparison of Calculated and Experimental Fatigue 127
Life 127
Conclusions 141
References 143
Index 151