Nieslony / Macha Spectral Method in Multiaxial Random Fatigue

1. Auflage 2007
ISBN: 978-3-540-73823-7
Verlag: Springer-Verlag
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 148 Seiten

Themonographisdevotedtothespectralmethodfordeterminationoffatigue life of machine elements and structures under multiaxial service loading. A detailed review of literature on spectral methods that includes: publications describing various relations between histories of loading and power spectral density functions, some methods of fatigue life determination under Ga- sian loading and under multiaxial service loading has been presented in the monograph. The monograph contains theoretical foundations of the spectral method for fatigue life determination. The authors have discussed a rule of description of random loading states with the matrix of power spectral d- sity functions of the stress/strain tensor components. Some chosen criteria of multiaxial fatigue failure being linear combinations of stress or strain com- nents on the critical plane have been analyzed. The proposed formula enables to determine power spectral density of the equivalent history directly from the components of the power spectral density matrix of the multidimensional stochastic process. The assumptions and the procedure of determination of basic relationships of the spectral method according to stress and strain - proacheshavebeen presented. The authors workedout equations determining the fatiguelife accordingto the spectralmethod using various linear hypot- ses of fatigue damage accumulation.

Autoren/Hrsg.

Nieslony, Adam

Macha, Ewald

Inhaltsverzeichnis

1;Preface;6
2;Contents;8
3;List of Symbols;10
4;Introduction;12
5;Spectral Methods for Fatigue Description;15
5.1;2.1 Random Gaussian Loading;15
5.2;2.2 Random Non-Gaussian Loads;36
5.3;2.3 Multiaxial Loading;39
6;Theoretical Fundamentals;45
6.1;3.1 Description of Random Stress and Strain States;45
6.2;3.2 Multiaxial Fatigue Failure Criteria;48
6.3;3.3 Power Spectral Density Function of Equivalent History;52
6.4;3.4 Amplitude Distribution in Spectral Methods;55
6.5;3.5 Spectral Method of Fatigue Life Determination;58
7;Algorithm of Spectral Method for Evaluation of Fatigue Life;75
7.1;4.1 Block 1 – Loading;75
7.2;4.2 Block 2 – Determination of Critical Plane Position;76
7.3;4.3 Block 3 – Calculation of Power Spectral Density Function of Equivalent Stress or Strain;78
7.4;4.4 Block 4 – Statistical Parameters;78
7.5;4.5 Block 5 – Calculation of Fatigue Life;78
8;Simulations;80
8.1;5.1 Algorithm, Assumptions and Objectives of Simulations;80
8.2;5.2 Input Quantities;82
8.3;5.3 Analysis of Positions of Critical Planes;90
8.4;5.4 Analysis of Equivalent Quantities;109
8.5;5.5 Analysis of Fatigue Life;111
9;Experimental Studies;120
9.1;6.1 Test Stands;120
9.2;6.2 Material and Geometry of Tested Specimens;124
9.3;6.3 Testing under Narrow-Band Frequency Loading;125
9.4;6.4 Testing under Broad-Band Frequency Loading;126
9.5;6.5 Comparison of Calculated and Experimental Fatigue;127
9.6;Life;127
10;Conclusions;141
11;References;143
12;Index;151