Journal ArticleDOI
Cumulative Damage in Fatigue: A Step towards Its Understanding:
R. H. W. Brook,J. S. C. Parry +1 more
TLDR
In this article, a method is described which uses changes of apparent dynamic modulus and damping during fatigue cycling, for estimating accurately the fatigue lives of stainless steel (Rex 535) specimens.Abstract:
A method is described which uses changes of apparent dynamic modulus and damping during fatigue cycling, for estimating accurately the fatigue lives of stainless steel (Rex 535) specimens This technique for estimating well in advance of failure the fatigue lives of individual specimens avoids the usual difficulties caused by scatter of fatigue results, and has enabled a more precise quantitative investigation to be made of cumulative fatigue damage (ie damage due to multi-level loading) than would have been possible using conventional experimental methods By estimating the remaining life of a specimen at one stress amplitude before measuring the equivalent remaining life at a second stress amplitude by cycling to failure, it was possible to determine lines of equal damage on a plot of stress amplitude versus remaining fatigue life These lines of equal damage were used to predict the fatigue lives of specimens subjected to programmes of multi-level loading, and the accuracy of these estimates, when coread more
Citations
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Multibody System Dynamics: Roots and Perspectives
TL;DR: There is a strong interest on multibody systems in analytical and numerical mathematics resulting in reduction methods for rigorous treatment of simple models and special integration codes for ODE and DAE representations supporting the numerical efficiency.
Journal ArticleDOI
Thermal Loading and Lifetime Estimation for Power Device Considering Mission Profiles in Wind Power Converter
TL;DR: In this paper, a relative more advanced approach is proposed, which is based on the loading and strength analysis of devices and takes into account different time constants of the thermal behaviors in power converter.
Journal ArticleDOI
Cumulative Damage Models and Multi-Stress Fatigue Life Prediction:
Woonbong Hwang,K.S. Han +1 more
TL;DR: In this paper, three different cumulative damage models were defined using several physical variables such as fatigue modulus and resultant strain, and the proposed models were derived as functions of nor malized applied stress level, r, and number of fatigue cycle, n.
Journal ArticleDOI
A high-cycle accumulation model for sand
TL;DR: In this paper, a high-cycle explicit model for the accumulation of strain in sand due to small cyclic loading is presented, and the dependence of the accumulation rate on stress, void ratio, cyclic history and the type of loading is discussed.
Journal ArticleDOI
Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives
TL;DR: In this article, the authors provide a comprehensive state-of-the-art overview of the literature on fatigue and cyclic loading of natural rock materials, and provide an overview of different experimental set-ups applied to cyclic/fatigue investigation of rock materials.
References
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Journal ArticleDOI
A study of the occurrence of peptide nitrogen in the blood.
TL;DR: The nitrogen found in tungstic acid blood filtrates, which cannot be attributed definitely to any known nitrogenous substances, has been studied by the following method and it appears that easily hydrolyzed peptides are responsible for a large percent of the undetermined rest nitrogen.
Journal ArticleDOI
Cumulative Fatigue Damage under a Symmetrical-Sawtooth Loading Programme:
TL;DR: In this article, a modified rotating bending fatigue machine which enables specimens to be submitted to repeated stress cycles modulated by a symmetrical-sawtooth wave, i.e. to a triangular stress block, is described.
Journal ArticleDOI
Structural changes and energy dissipation during fatigue in copper
N Thompson,N J Wadsworth +1 more
TL;DR: In this paper, simultaneous observations have been made of the metallographic changes visible on the surface, and of the changes in energy dissipation, which take place during the fatigue testing of specimens of fully annealed copper.
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