Mean stress sensitivity of sintered iron and steel

Namazov, S. N.; Abdalla, Gomma; Dalgic, M.; Gudenau, Heinrich Wilhelm; Beiss, Paul

doi:10.3139/146.030737

Cited by 3 publications

(9 citation statements)

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“…6 and 7, a line is fitted to the data corresponding to each mean stress. Namazof et al 11. also showed that the stress amplitude versus the cycle number of PM iron and steel can be approximated by declining straight lines before 10 7 cycles.…”

Section: Resultsmentioning

confidence: 96%

“…In principle the fatigue life is shortened by tensile and extended by compressive mean stress. 3,[10][11][12][13] The plastic deformation increases with an increase in the value of mean stress. Investigation on the pore morphology in unetched samples reveals that for tensile mean stress pores are widened and linked up by cracks (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This fact presents the negative effect of tensile mean stress on fatigue life of Distaloy AE, which was confirmed by investigators for other PM steels. 10,11,13 The intersection of constant-life diagrams with horizontal axis is the ultimate tensile strength obtained by conducting a tensile test on Distaloy AE PM steel.…”

Section: Resultsmentioning

confidence: 99%

“…10 and 11 that the experimental data show a good agreement with the Gerber parabola [equation ( 4)], however, Goodman line represents a conservative estimation of the fatigue failure. Beiss, 10 Namazof et al 11 and Bergmark 12 presented such diagrams for cyclic tension and cyclic bending for the most commonly used PM steels with various chemical composition and surface heat treatments. They proposed a linear trend for stress amplitude loss against increasing of mean stress for all PM steels.…”

Section: Resultsmentioning

confidence: 99%

“…3 The effect of microstructure and density on fatigue behaviour of such steels is the subject of many researches and papers. 8,9 Relatively few authors 3,[10][11][12][13] applied more basic scientific consideration to understand the fatigue response of sintered iron based material in different modes and superimposed mean stress.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic behaviour of Distaloy AE powder metallurgy steel with superimposed tensile mean stress

2011

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In the present work, Distaloy AE powder metallurgy (PM) steel, in as-sintered state are experienced under uniaxial fatigue tests in a range of tensile mean stresses. Microstructural investigations reveal that for tensile mean stress, pores are widened and easily linked up by cracks. Moreover, with obtained fatigue results, well-known fatigue failure criteria, such as Goodman, Gerber and Morrow, are employed to the experimental data. The result shows that the experimental data for Distaloy AE porous sintered steel are well suited to these criteria especially in the case of Morrow and Gerber failure criteria. Furthermore, the alteration of samples length versus cycles shows the cyclic hardening behaviour for this diffusion-bonded PM steel. It seems that this concept is a reason for increasing the fatigue property of diffusion-bonded steels in comparison with other PM Steels.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic behaviour of Distaloy AE powder metallurgy steel with superimposed tensile mean stress

2011

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Stress based fatigue life assessment of sintered steels and aluminium under variable amplitude loading

Götz

Eulitz

2013

Powder Metallurgy

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This paper aims to give an insight into the reliability of fatigue life assessment results for powder metallurgy (PM) components subjected to variable amplitude loading. In this study, notched specimens of two PM steel and two PM aluminium alloys are examined. As the experimental basis, constant amplitude tests with different stress amplitudes and stress ratios (to determine the S-N curves and mean stress sensitivities) as well as service load tests (variable amplitude loading) were carried out. The fatigue life was calculated, applying different modifications of the linear damage accumulation. The results of the experiments and calculations were compared and statistically evaluated. Regarding the resulting scatter, the fatigue life assessment with the modified damage accumulation by Zenner and Liu is recommended. Furthermore, mean relative damage sums are derived, which can be used to correct the fatigue life calculation. For PM steel, these values are very similar to compact steels, whereas they are higher for PM aluminium.

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Functional Relationships between Fatigue Data

Beiss

2007

MSF

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Most PM components are exposed to cyclic loading over long periods of time, and the endurable stress amplitude is an important factor considered in many applications. With the continuously growing volume of experimental test results, functional relationships can be derived which permit predictions on the effects of density ρ, external notches characterized by a stress concentration factor Kt, and static mean stresses σm for standardized test specimen geometries.

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Mean stress sensitivity of sintered iron and steel

Cited by 3 publications

References 1 publication

Cyclic behaviour of Distaloy AE powder metallurgy steel with superimposed tensile mean stress

Cyclic behaviour of Distaloy AE powder metallurgy steel with superimposed tensile mean stress

Stress based fatigue life assessment of sintered steels and aluminium under variable amplitude loading

Functional Relationships between Fatigue Data

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