This book presents the unified fatigue life prediction equation for low/medium/high cycle fatigue of metallic materials relevant to plain materials and notched components. The unified fatigue life prediction equation is the Wöhler equation, in which the "stress-based intensity parameter" is calculated based on the linear-elastic analysis.
A local approach for the static fracture analysis for notched components is presented based on the notch linear-elastic stress field. In the local approach, a stress intensity parameter is taken as a stress-based intensity parameter. Experimental verifications show that the local approach is also suited for the static fracture analysis for notched components made of ductile materials.
The book is also concerned with a material failure problem under the multiaxial stress states. A concept of the material intensity parameter is introduced in this book. It is a material property parameter that depends on both Mode-I fracture toughness and Mode-II (or Mode-III) fracture toughness and the multiaxial parameter to characterize the variation of the material failure resistance (notch fracture toughness) with the multiaxial stresses states. The failure condition to assess mixed-mode fracture of notched (or cracked) components is stated as the stress-based intensity parameter being equal to the material intensity parameter.
With respect to the traditional S-N equation, a similar S-N equation is presented and verified to have high accuracy.
This book will be of interest to professionals in the field of fatigue and fracture for both brittle and ductile materials.
1. Introduction,
2. Applicability of the Wöhler Curve Method for a
Low/Medium/High Cycle Fatigue of Metallic Materials,
3. Notch S-N Equation
for a Low/Medium/High Cycle Fatigue of Metallic Materials,
4. A Local
Approach for Fracture Analysis of V-Notch Specimens Under Mode I Loading,
5.
A Local Stress Field Failure Model for Sharp Notches,
6. An Empirical
Fracture Equation of Mixed Mode Cracks,
7. An Empirical Failure Equation to
Assess Mixed-Mode Fracture of Notched Components,
8. A New Type of S-N
Equation and Its Application to Multiaxial Fatigue Life Prediction
Yan Xiangqiao is currently Professor at Harbin Institute of Technology. His research interests include the fatigue and fracture of engineering materials and structures, and he has published more than 100 papers in international journals.
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