Load history effects in ductile cast iron for wind turbine components

Hübner, P.; Schlosser, H.; Pusch, G.; Biermann, Horst

doi:10.1016/j.ijfatigue.2007.01.012

Cited by 48 publications

(52 citation statements)

References 6 publications

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“…It can be noted that about 1/3 of the graphite has degenerated into chunky graphite and that the remaining fraction of spheroidal graphite has overgrown to very large nodules with a mean diameter of about 300 micron. The shape factor of the spheroidal nodules equal to about 0.5 is pretty low in comparison to data available in the literature for DCI obtained under normal solidification conditions [47]. …”

Section: Microstructurecontrasting

confidence: 60%

“…To better characterize type, shape and distribution of the graphite particles, ten cross-sections randomly extracted from the samples are metallographically prepared and statistically analyzed. Specifically, the deviation from the spherical shape is estimated by the shape factor expressed as [47]:…”

Section: Microstructurementioning

confidence: 99%

“…However, the design of high-added value components of large dimensions, such as those employed in MW-series wind turbines [47], cannot rely on the knowledge of these mechanical properties only. In fact, infinite life design approaches usually take large safety margins thus resulting in very heavy constructions, while safe life approaches suffer from large uncertainty on the actual lifetime of the component prior to its withdrawal from service.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue and Fracture Resistance of Heavy-Section Ferritic Ductile Cast Iron

Benedetti

Torresani

Fontanari

et al. 2017

Metals

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Abstract:In this paper, we explore the effect of a long solidification time (12 h) on the mechanical properties of an EN-GJS-400-type ferritic ductile cast iron (DCI). For this purpose, static tensile, rotating bending fatigue, fatigue crack growth and fracture toughness tests are carried out on specimens extracted from the same casting. The obtained results are compared with those of similar materials published in the technical literature. Moreover, the discussion is complemented with metallurgical and fractographic analyses. It has been found that the long solidification time, representative of conditions arising in heavy-section castings, leads to an overgrowth of the graphite nodules and a partial degeneration into chunky graphite. With respect to minimum values prescribed for thick-walled (t > 60 mm) EN-GJS-400-15, the reduction in tensile strength and total elongation is equal to 20% and 75%, respectively. The rotating bending fatigue limit is reduced by 30% with respect to the standard EN-1563, reporting the results of fatigue tests employing laboratory samples extracted from thin-walled castings. Conversely, the resistance to fatigue crack growth is even superior and the fracture toughness comparable to that of conventional DCI.

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Section: Microstructurecontrasting

confidence: 60%

Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fatigue and Fracture Resistance of Heavy-Section Ferritic Ductile Cast Iron

Benedetti

Torresani

Fontanari

et al. 2017

Metals

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“…tapes are bonded on the specimen surface [1] As mentioned in Reference [2], the direct optical observation of the crack is the safest measurement method to determine the position of the crack tip and to calculate the crack length. However, it can hardly be automated and the detection of small changes in crack size needs high magnification.…”

Section: Fig 1 Experimental Setup For the Cmod And Crack Propagatiomentioning

confidence: 99%

“…Fig. 1 shows the traditional and most widely used method and experimental setup for the Crack Mouth Opening Displacement (CMOD) and crack propagation investigation [1]. The method comprises the usage of relatively expensive Krak Gage konstantan tapes which are bonded on the specimen's surface.…”

Section: Introductionmentioning

confidence: 99%

Crack Tip Position Determination Using Infrared Thermography and Digital Image Correlation

Čanžar¹,

Tonković²,

Boras³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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This paper presents an experimental and numerical study of the crack initiation and propagation in the nodular cast iron grade EN-GJS-400-18-LT. Therein, non-contact Digital Image Correlation is used to study the development of the tensile damage along the crack path and to identify the crack tip position. Based on the experimental results, a new three-dimensional constitutive model is proposed to simulate the low-cycle fatigue behaviour of considered material. Within the framework of numerical investigations the cyclic plasticity model together with the damage initiation and evolution criteria are applied to study the fatigue damage in the compact tension specimen near the notch and the crack tip. The computational procedure accuracy is verified by comparing the computed results with the real experimental data. After successful application of the digital image correlation technique to identify the crack tip position, the next step is to investigate the development of the dissipated energy along the crack path using the infrared thermography.

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