Tests of the Fatigue Strength of Cast Iron PDF Download
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Author: Edward Charles Schmidt
Publisher:
ISBN:
Category : Cast-iron
Languages : en
Pages : 270
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Author: Edward Charles Schmidt
Publisher:
ISBN:
Category : Cast-iron
Languages : en
Pages : 270
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Author: Herbert Fisher Moore
Publisher:
ISBN:
Category : Cast-iron
Languages : en
Pages : 50
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Author: Alonzo Plumsted Kratz
Publisher:
ISBN:
Category : Architectural acoustics
Languages : en
Pages : 40
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Author: University of Illinois (Urbana-Champaign campus). Engineering Experiment Station
Publisher:
ISBN:
Category : Drilling and boring machinery
Languages : en
Pages : 274
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Author: Mattias Lundberg
Publisher: Linköping University Electronic Press
ISBN: 9176853586
Category :
Languages : en
Pages : 59
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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.
Author: Michael Roger Mitchell
Publisher:
ISBN:
Category : Iron
Languages : en
Pages : 156
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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.
Author: Herbert F. Moore
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 28
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Author: United States. Office of Experiment Stations
Publisher:
ISBN:
Category : Agricultural experiment stations
Languages : en
Pages : 1008
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Author: Mahmoud Helmi Attia
Publisher: ASTM International
ISBN: 0803114486
Category : Fatigue testing machines
Languages : en
Pages : 275
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