Fatigue behaviour of punched structural plates

Sanchez, Luis; Gutiérrez‐Solana, F.; Pesquera, D.

doi:10.1016/j.engfailanal.2003.10.002

Cited by 35 publications

(12 citation statements)

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“…Finally, a burr is observed at the bottom of punched edges because of the metal elongation resulting from the separation into two pieces. This morphology has been observed by various authors on steel sheets with different thicknesses ranging from 0.5 to 15 mm [2,6].…”

Section: Specimenssupporting

confidence: 73%

“…The fatigue properties of Fe-Si thin sheets are influenced not only by these geometrical and metallurgical features, but also by the alterations caused by fabrication processes. However, though a significant influence of fabrication processes on fatigue properties is generally observed [1,2], very few studies focus on Fe-Si thin sheets, for which the grain size is comparable to the thickness. In the present work, the impact of punching operations, involved in the mass production of electrical machines, on the fatigue properties of Fe-Si thin sheets is therefore investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Such defects, because they cause stress concentration, are favorable to fatigue crack initiation [1]. For instance, for three different steel grades, the fatigue strength at 5 Â 10 6 cycles of 15 mm thick punched plates is half that of drilled ones [2]. According to these authors, the degradation of the fatigue resistance of punched plates results from both the existence of a 2 mm deep damaged zone and the important surface roughness.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the impact of punching operations on the high cycle fatigue strength of Fe–Si thin sheets

Dehmani

Brugger

Palin‐Luc

et al. 2016

International Journal of Fatigue

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a b s t r a c tIn this paper, the impact of punching operations on the high cycle fatigue strength of Fe-Si thin sheets is investigated. High cycle fatigue tests are performed on both punched and polished edge specimens. Results show a significant decrease of the fatigue strength in the case of punched specimens. Different factors are found to be responsible for this degradation. First, according to SEM observations of fracture surfaces and to 3D surface topography, fatigue crack initiation is strongly governed by the geometrical defects resulting from punching operations. Second, important tensile residual stresses, which are analyzed using X-ray diffraction techniques, are observed on punched edges. Depending on the loading conditions, it is possible for the residual stress field to be redistributed as a result of cyclic plasticity.

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Section: Specimenssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study of the impact of punching operations on the high cycle fatigue strength of Fe–Si thin sheets

Dehmani

Brugger

Palin‐Luc

et al. 2016

International Journal of Fatigue

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“…Since rotors are subjected to cyclic loadings, safely designing electrical machines against fatigue failure requires the understanding of the influence of punching operations on the fatigue behavior of Fe-Si thin sheets. As shown in different studies [1][2][3][4][5], important geometrical defects resulting from punching operations are observed on edges. Such defects, because they can be considered as potential fatigue crack initiation sites, are partly responsible for a degradation of the fatigue strength.…”

Section: Introductionmentioning

confidence: 86%

High Cycle Fatigue Strength of Punched Thin Fe-Si Steel Sheets

Dehmani

Brugger

Palin‐Luc

et al. 2016

Materials Performance and Characterization

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Some parts of electrical machines are built from stacks of thin steel sheets, for which the coarse grain microstructure allows for minimizing magnetic losses.The fabrication process of these parts usually involves punching operations that generate important defects on the edges. Since these alterations may 3D optical profilometer, allowing us to identify the critical defect. It is found that the typical defect size is comparable to the grain size. KeywordsFe-Si steel sheet, HCF fatigue, punching effect, temperature effect, residual stress, defect

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“…Further tests on plates with punched or drilled holes are reported in (Sánchez et al 2004). Again punched hole specimens were shown to have much lower fatigue life than the drilled ones.…”

Section: Plate With Hole In Nominal Stressmentioning

confidence: 99%