Download or read book Standardization of Fretting Fatigue Test Methods and Equipment written by Mahmoud Helmi Attia and published by ASTM International. This book was released on 1992 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of Fretting Corrosion on Fatigue Strength of Nodular Cast Iron and Steel Under Constant Amplitude and Load Spectrum Tests written by O. Buxbaum and published by . This book was released on 1992 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fatigue life reduction caused by fretting corrosion was determined in comparative fatigue life tests for axially loaded flat specimens made of GGG 40 (cast nodular iron, ASTM A 536-80: 60-40-12) and of St 34-2 (hot rolled structural steel, ASTM A 283-78: Grade C). A special test rig was constructed for superimposing fretting corrosion onto constant amplitude and spectrum loading of the specimen. Various surface conditions and two levels of surface pressure were investigated. Using the results of these tests and the parameters derived, comparative damage calculations were performed aiming at predicting fatigue life in the presence of fretting corrosion. Means to avoid fretting corrosion were also explained.
Download or read book Fretting Corrosion written by Raymond H. Comyn and published by . This book was released on 1963 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data from over 200 reports from the English literature on fretting corrosion were summarized for ready reference--for engineers who must consider its effect in designing mechanical and electrical devices and for scientists who may wish to investigate the underlying mechanism. The actual wear, frictional changes, variations in electrical resistances and electrical noise, and fatigue due to fretting are described to acquaint the designer with difficulties to be anticipated from this problem. Factors affecting fretting, its effect on the fatigue strength of materials and methods of preventing it are discussed. The main theories that have been proposed to explain fretting corrosion and test methods that have been used to study it are reviewed. (Author).
Download or read book Fatigue Life of a SG Cast Iron Under Real Loading Spectra written by J-F Vittori and published by . This book was released on 2004 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper deals with the effect on life of the desynchronism between two variable amplitude load sequences in combined bending and torsion. Experiments were carried out on smooth specimens made of the EN-GJS800-2 cast iron. The comparison between experimental lives and predicted ones with the following fatigue life calculation methods is presented: Smith-Watson-Topper, Fatemi and Socie (method proposed by Bannantine), Wang and Brown, Socie's proposal for high cycle fatigue, and Morel. If the scatter of experiments is considered, these experiments show a low effect of the correlation factor on life. All the simulated fatigue life calculation methods give good results for proportional loads, but their predictions are not good for non-proportional loads. Morel's proposal seems to be the best to predict life of the tested material with our non-proportional fatigue test conditions.
Download or read book Residual stresses fatigue and deformation in cast iron written by Mattias Lundberg and published by Linköping University Electronic Press. This book was released on 2018-09-03 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The complex geometry of cylinder heads in heavy-duty diesel engines makes grey iron or compact graphite iron a preferred material choice due to its price, castability, thermal conductivity and damping capacity. Today’s strict emission laws have increased the demands on engine performance and engine efficiency. This means that material properties such as fatigue resistance need to be improved. Shot peening is often used to improve the fatigue resistance of components and the benefits of shot peening are associated with the induced compressive surface stresses and surface hardening. How different shot peening parameters can affect fatigue strength of grey and compact graphite iron has been investigated within the project underlying this thesis. To do this, X-ray diffraction (XRD) was utilized for residual stress measurements, scanning electron microscopy (SEM) for microstructural characterizations and mechanical fatigue testing for mechanical quantifications. The ultimate aim of this work has been to increase the fatigue resistance of cast iron by residual stress optimization. XRD measurements and SEM examinations revealed that the shot peening parameters shot size and peening intensity significantly influence residual stresses and surface deformation. Residual stress profiles, similar to the one general considered to improve the fatigue strength in steels, were obtained for both grey and compact graphite iron. Uniaxial push-pull fatigue testing on grey iron with these shot peening parameters reduced the fatigue strength with 15–20 %. The negative effect is likely related to surface damage associated with over peening and relatively high subsurface tensile residual stresses. With very gentle shot peening parameters, the uniaxial fatigue strength were unaltered from the base material but when subjected to bending fatigue an increase in fatigue strength were observed. An alternative way to increase the fatigue strength was to conduct a 30 min annealing heat treatment at 285 XC which increased the fatigue strength by almost 10 % in uniaxial loading. The improvement could be an effect of favourable precipitates forming during the annealing, which could hinder dislocation movement during fatigue. Measuring residual stresses using XRD and the sin2 -method demands accurate X-ray elastic constants (XEC) for meticulous stress analysis. The XEC referred to as 1~2s2 should therefore always be calibrated for the specific material used. The experiments conducted revealed that the XEC value is independent of the testing method used in this work. A small correction from the theoretical value should be applied when the material contains small amounts of residual stresses. The amount of residual stresses has a great impact on the XEC and thus on the stress analysis. Concluding that proper analysis of residual stresses in cast iron is not straight forward.
Download or read book Tests of the Fatigue Strength of Cast Iron written by Edward Charles Schmidt and published by . This book was released on 1927 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1993 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Fretting Corrosion on the Fatigue Strength of Fitted Members written by Oscar J. Horger and published by . This book was released on 1952 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closely fitted design members, which are clamped, pressed, or shrunk together develop fretting corrosion between the mating surfaces when subjected to fluctuating stresses. Aside from the wear which changes the geometry of the mating surfaces, there also results a greatly reduced fatigue resistance. It is this latter aspect, along with means of improving the fatigue resistance, that is discussed here because of the increasing number of service failures occurring in all types of machinery and equipment due to fretting. This paper first discusses the fundamental nature of the fatigue problem associated with fretting. Eight factors are then separately treated as to how each one influences the fatigue strength regarding both the initiation and propagation of fatigue cracks. These factors include the effects of the degree of the clamping pressure, shape or geometry of assembly, fretting, residual stresses, different engineering steels and heat treatments, surface finish, simultaneous water corrosion, and type of lubricant used between the mating surfaces. After reviewing these factors it is apparent that some limited improvement in fatigue resistance may be obtained against the initiation of fatigue cracks due to fretting. Means are available for obtaining much greater improvement in fatigue resistance against fatigue crack propagation.
Download or read book High Cycle Variable Amplitude Fatigue of a Nodular Cast Iron written by GB. Marquis and published by . This book was released on 2004 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides a brief summary of life prediction methods for variable amplitude fatigue. Special attention is given to cracks propagating from nominally defect free components in the high cycle regime where a significant portion of the fatigue damage can be attributed to cycles with amplitude less than the fatigue limit observed under constant amplitude loading. Constant and variable amplitude fatigue data for a nodular cast iron are presented. An effective stress method for variable amplitude loaded similar to the Topper model is developed. Most model parameters are derived from constant amplitude S-N curves and the Haigh diagram, but two sets of long life variable amplitude tests are needed to derive the variable amplitude interaction parameters.
Download or read book Fretting Corrosion written by Robert Barry Waterhouse and published by Pergamon. This book was released on 1972 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Fretting Corrosion and Its Influence on Fatigue Strength written by Donald Henry Rimbey and published by . This book was released on 1967 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experiments in Hot Rolling and Forging of Ductile Cast Iron written by L. A. Neumeier and published by . This book was released on 1980 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue of Metals written by Roger Cazaud and published by . This book was released on 1953 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of the Cyclic Deformation and Fracture Behavior of Nodular Cast Iron written by R. A. Testin and published by . This book was released on 1973 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monotonic and fatigue test results are reported for three high hardness nodular irons with the same matrix structure and different mean nodule sizes. In addition, monotonic and fatigue data are reported for high carbon-silicon.
Download or read book Tests of the Fatigue Strength of Cast Steel written by University of Illinois (Urbana-Champaign campus). Engineering Experiment Station and published by . This book was released on 1926 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Mean Stress and Stress Concentration on Fatigue Behavior of Ductile Iron written by Nicholas Meyer and published by . This book was released on 2014 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cast iron tends to be more economical to manufacture than steel, but its microstructure is riddled with internal defects. With improvements in casting technology, cast iron can compete with steel in some applications due to the ability to maintain similar strength. One objective of this study was to analyze data obtained from literature and make predictive correlations between tensile, microstructural, and fatigue properties. Another objective of this study was to evaluate tensile and compressive mean stress effects on smooth and notched fatigue behavior of 120-90-02 ductile cast iron experimentally, as well as analytically by using predictive models. The relationship between these two objectives is such that with successful correlations of fatigue limit with mechanical properties, fewer experiments could be performed to verify analytical results. This grade of cast iron was selected by Eaton Corporation, who helped fund this study. The material, 120-90-02 ductile cast iron, was machined and heat-treated as provided by Eaton Corporation. Neuber's rule, strain energy density, and finite element methods were used to obtain stresses and strains at the notch. Modified Goodman, Smith- iv Watson-Topper, FKM and the Fatemi-Socie mean stress parameters were used to account for mean stress effect on fatigue life of both smooth and notched specimens. Mean stress levels were chosen such that the R-ratios in load-controlled tests were -8, -7, -3, -1, 0, 1/3, 0.5, and 0.75. By understanding the fatigue behavior of material under varying degrees of mean stress, design safety can be improved by properly accounting for the effect of mean stress that a component may be subjected to. The Smith-Watson-Topper mean stress parameter proved to be the best method for life prediction for both smooth and notched specimens, based on the nominal stress approach. Using the local approach, which considers notch root stresses and strains, the Fatemi-Socie fatigue parameter used with the strain energy density rule provided better results compared to the Smith-Watson-Topper mean stress parameter.
Download or read book A Unified Predictive Technique for the Fatigue Resistance of Cast Ferrous based Metals and High Hardness Wrought Steels written by Michael Roger Mitchell and published by . This book was released on 1976 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: A technique which treats the free graphite in gray and nodular cast iron, gas pores and microshrinkage cavities in cast steels and inclusions in wrought, high hardness steels as notches in a steel matrix results in quantitative.
