Micromechanisms of fracture in nodular cast iron: From experimental findings towards modeling strategies – A review

Hütter, Geralf; Zybell, Lutz; Kuna, Meinhard

doi:10.1016/j.engfracmech.2015.06.042

Cited by 83 publications

(70 citation statements)

References 115 publications

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“…The microfractographic analysis was made by the scanning electron microscope VEGA II LMU on fracture surfaces of the specimens fractured by fatigue tests [16,17]. …”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading

Vaško¹

2017

Archives of Metallurgy and Materials

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Three melts of ferrite-pearlitic nodular cast iron with different charge composition were used for fatigue tests. Wöhler fatigue curves and fatigue strength were obtained, and microstructure and fracture surfaces were investigated. The aim of the paper is to determine the influence of charge composition on microstructure, mechanical and fatigue properties of synthetic nodular cast irons and their micromechanisms of failure. Fatigue tests were realised at low frequency sinusoidal cyclic push-pull loading (stress ratio R = -1) at ambient temperature (T = 20 ±5°C). They were carried out with using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100 at frequency f ≈ 120 Hz. The results of fatigue tests at low frequency cyclic loading are compared with fatigue properties at high frequency cyclic loading.

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“…The microfractographic analysis was made by the scanning electron microscope VEGA II LMU on fracture surfaces of the specimens fractured by fatigue tests [16,17]. …”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading

Vaško¹

2017

Archives of Metallurgy and Materials

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“…Then, under tensile loading, ductile fracture is mainly driven by very early debonding of the nodules from the matrix, and coalescence of the subsequent growing voids. Evidence in the literature [8] suggests modeling the nodules as voids, as their load carrying capacity is very low under tensile loading. This simplifying assumption is made herein and the material is considered as a two-phase microstructure with a ferritic matrix and voids.…”

Section: Studied Materialsmentioning

confidence: 99%

Numerical modeling of ductile fracture at the microscale combined with X-ray laminography and digital volume correlation

Bouchard

Navas

Shakoor

et al. 2017

AIP Conference Proceedings

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Abstract. Predicting ductile fracture for complex loading paths is essential within the framework of metal forming processes. Most models are developed and used at the macroscopic scale and do not account explicitly for material microstructures. This paper describes a methodology aiming at understanding and modeling ductile damage mechanisms at the microscale. This methodology relies on (i) the acquisition of X-Ray laminography pictures during in-situ tensile tests, (ii) digital volume correlation (DVC) to measure 3D displacement and strain fields in the bulk and (iii) 3D finite element (FE) modeling of the heterogeneous microstructure including ductile damage mechanisms. The methodology is illustrated on nodular graphite cast iron. FE simulations of the heterogeneous microstructure are conducted and compared with DVC results and the influence of boundary conditions is discussed.

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“…The graphite nodules are modeled as zones with very low Young's modulus [18,21,22,19,25], while the ferritic matrix is considered as an elastoplastic medium with power law hardening…”

Section: Simulationsmentioning

confidence: 99%

“…Upon loading, ductile fracture is caused by nodule/matrix debonding, void growth and coalescence [18,19,20]. Literature data [18,21,22,19] show that the nodules can be modeled as voids since their stress-carrying capacity is very small in tension. Such hypothesis will be made herein.…”

Section: Introductionmentioning

confidence: 99%

Experimental-Numerical Validation Framework for Micromechanical Simulations

Buljac

Shakoor

Neggers

et al. 2017

Multiscale Modeling of Heterogeneous Structures

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A combined experimental-numerical framework is presented in order to validate computations at the microscale. It is illustrated for a flat specimen with two holes, which is made of cast iron and imaged via in situ synchrotron laminography at micrometer resolution during a tensile test. The region in the reconstructed volume between the two holes is analyzed via Digital Volume Correlation (DVC) to measure displacement fields. Finite Element (FE) simulations, whose mesh is made consistent with the studied material microstructure, are driven by measured Dirichlet boundary conditions. Damage levels and gray level residuals for DVC measurements and FE simulations are assessed for validation purposes.

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Micromechanisms of fracture in nodular cast iron: From experimental findings towards modeling strategies – A review

Cited by 83 publications

References 115 publications

Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading

Fatigue Properties of Nodular Cast Iron at Low Frequency Cyclic Loading

Numerical modeling of ductile fracture at the microscale combined with X-ray laminography and digital volume correlation

Experimental-Numerical Validation Framework for Micromechanical Simulations

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