by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English
|Statement||J.C. Newman, Jr., E.P. Phillips, and R.A. Everett, Jr.|
|Series||NASA technical memorandum -- 109044.|
|Contributions||Phillips, E. P., Everett, R. A., Langley Research Center.|
|The Physical Object|
Fatigue failure is a multi-stage process. It begins with the initiation of cracks, and with continued cyclic loading the cracks propagate, finally leading to the rupture of a component or specimen. The demarcation between the above stages is not well-defined. Depending upon the scale of . This paper reviews the capabilities of a plasticity-induced crack-closure model and life-prediction code to predict fatigue crack growth and fatigue lives of metallic materials. Crack-tip constraint factors, to account for three-dimensional effects, were selected to correlate large-crack growth rate data as a function of the effective-stress-intensity. Fatigue lives were calculated using the crack-growth relations and microstructural features like those that initiated cracks for the aluminum alloys and steel for edge-notched specimens. An equivalent- initial-flaw-size concept was used to calculate fatigue lives in other cases. Results from the tests and analyses agreed Size: 1MB. Prediction methods for fatigue lives and fatigue crack growth are discussed as well as verification by experiments. Load spectra analysis and statistical aspects are also addressed. The first edition of this book was well received and has been used extensively in various courses taught to staff members and students of universities and other Brand: Springer Netherlands.
In order to accurately predict the total fatigue life, quantitative simulation of the crack growth behavior is needed. When a crack reaches a sufficient length, the crack growth behavior is not sensitive to the microstructure and is described by linear elastic fracture by: 8. The fatigue life of bogie beam 1 was predicted with four different methods: the S-N-method, the fracture mechanics method, and the modification of the HdM-method with different values on the crack closure stress level. The predictions made with the two first methods were made by ABB Corporate Research and is reported in detail by: 3. fatigue crack growth rate equation for the remaining life. The two lives are added together to obtain the total fatigue life. All four of these fatigue life models are covered in this course/book File Size: KB. Fatigue life and crack growth prediction methodology Geshelin, V.G., Polunin, V.I. and Akhant'ev, V.P. Met. Sci. Heat Treat. (Russia) (July ) 36 (), In order to provide high strength to cyclic loads for structural steels; methods of surface hardening by thermochemical treatment are widely applied.
This chapter describes a computational methodology for fatigue crack growth analysis and damage prognosis in structures. This methodology is applicable to a variety structural components and systems with complicated geometry and subjected to Author: Shankar Sankararaman, You Ling, Sankaran Mahadevan. fatigue tests and stress-life (s-n) approach fatigue testing loading test machines specimens standards stress-life apperoach s-n curves mean stress effects on s-n behavior factors influencing s-nbehavior fatigue crack growth testing is covered in section Get this from a library! Fatigue life and crack growth prediction methodology. [J C Newman; Edward P Phillips; R A Everett; Langley Research Center.]. Fatigue Life Enhancement, XV. Fatigue Life Prediction and Test, XVI. Fatigue Modelling and Simulation, XVII. Fatigue of Coatings, XVIII. Fracture Processes and Fatigue in Rocks, XIX. Fretting and Contact Fatigue, XX. Growth of Short and Long Cracks, XXI. Laser Shock Peening, XXII. Life Prediction Methodology and Software Development, XXIII.