By G. Marquis and J. Solin (Eds.)
This quantity incorporates a choice of papers awarded at Fatigue layout ninety five held in Helsinki, Finland from 5-8 September 1995. The papers were peer reviewed and current sensible facets for the layout of parts and constructions to prevent fatigue failure. subject matters lined contain: fatigue layout stories, flooring automobile parts, part reliability, multiaxial fatigue, notch research, carrier loading, welded buildings, probabilistics points in fatigue, fatigue layout optimization.
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The other type of defects in the rim zone, the slag or graphite stringer is more harmful. The depth of the stringer is so large that the compressive stresses can not penetrate at these depth, therefore the defect is most harmful. It is also important to develop more effective none destructive testing methods to sort out components containing crucial defects, such as different types of stringer. As can be seen from the results in table 6 the stringers grater than 0,5 mm in depth (a-value) is injurious.
For estimated average graphite flake sizes, the predicted fatigue strengths are conservative and lie below all failure data points. The proposed methodology provides significantly improved estimates of fatigue strength compared with predictions based on local surface stresses. Further work is required, however, to generalise it to other materials. REFERENCES 1. 2. 3. 4. 5. 6. 7. 8. N. (1979). 573-584. J. (1978). 201-206. S. (1981). In: Proceedings of Fatigue '81, Warwick University, SAE, pp. 40-51.
Allen and P. M. Hughes INTRODUCTION Fatigue cracking in engineering components is generally found to initiate at regions of stress concentration. Modem stress analysis techniques such as the finite element method provide the capability to accurately determine stress and strain fields around such features. However, when it comes to predicting the fatigue strength, it becomes apparent that existing fatigue design methods which utilise K^, Kf and uniaxial nominal stress can be inadequate and have become out of step with current stress analysis methods.