Fatigue crack propagation damaging micromechanisms in ductile cast irons

Cavallini, M.; Bartolomeo, O. Di; Iacoviello, Francesco

doi:10.1016/j.engfracmech.2007.02.002

Cited by 83 publications

(69 citation statements)

References 2 publications

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“…Generally, fracture morphology displays continuous riverpattern morphology and the direction of crack propagation is along river-pattern shape in the ductile cast iron with pearlite matrix [22,23] . In this work, when the pearlite matrix is subjected to the applied stress, plastic deformation mainly occurs at the ferrite regions and cementite layers, hindering the dislocation slip.…”

Section: Tensile Fracture Behavior Of As-cast Qt700-6 Alloymentioning

confidence: 99%

Refinement and fracture mechanisms of as-cast QT700-6 alloy by alloying method

Gao

et al. 2017

China Foundry

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Section: Tensile Fracture Behavior Of As-cast Qt700-6 Alloymentioning

confidence: 99%

Refinement and fracture mechanisms of as-cast QT700-6 alloy by alloying method

Gao

et al. 2017

China Foundry

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“…In a study on the micromechanisms of fatigue crack propagation in ductile [ cast irons with different microstructures, it was found that fatigue crack propagation in ferritic ductile cast irons occurred by both ductile striation and cleavage fracture growth, as well as graphite nodule debonding, independent of stress intensity range magnitude and mean stress level. [8] In the ferritic-pearlitic microstructures the ferritic shields around graphite nodules fractured by cleavage, while the pearlitic structure failed through both ductile and brittle striation growth. A crack closure effect related to graphite nodules was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6][7][8][9] A 3.73C/2,55Si/1.03Cu/1.25Ni ductile cast iron grade with graphite nodules in ferrite islands, a bulls-eye structure, and a pearlitic matrix as cast structure, was heat treated employing different schemes to obtain ferritic, ferritic-pearlic, pearlitic, tempered martensitic, and lower and upper ausferritic structures. [9] The effect on rotary bending fatigue strength, R ¼ À1, was investigated, and the lowest fatigue strength obtained was in the ferritic microstructure condition, but it also had by far the lowest tensile strength and matrix hardness.…”

Section: Introductionmentioning

confidence: 99%

Very High Cycle Fatigue of Two Ductile Iron Grades

Bergström

Burman

Svensson

et al. 2015

steel research int.

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Two ductile iron grades, EN-GJS-600-3 a ferritic-pearlitic grade, and EN-GJS-600-10 a silicon strengthened ferritic nodular iron grade, are studied in the very high cycle fatigue range using a 20 kHz ultrasonic test equipment. Fatigue strengths and SN-curves are achieved, and fracture surfaces and microstructures are investigated. The ferritic grade with higher ductility displays a lower fatigue strength at 10 8 load cycles than the ferritic-pearlitic grade, 142 and 167 MPa, respectively. Examination of fracture surfaces shows that fatigue failures are controlled by micropores in both of the ductile iron grades, while the graphite nodule distributions do not seem to influence the difference in fatigue strengths. Prediction of the fatigue strengths, using a model for ductile iron proposed by Endo and Yanase, indicates a large potential for improvement in particular for the ferritic grade.

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“…Micromechanics based approaches have been used for debonding damage analysis [6][7][8][9][10]. Cavallini, Bartolomeo, and Iacoviello [6] investigated the damage in three different ferriticpearlitic ductile cast irons with the main focus on graphite nodules debonding.…”

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confidence: 99%

“…Cavallini, Bartolomeo, and Iacoviello [6] investigated the damage in three different ferriticpearlitic ductile cast irons with the main focus on graphite nodules debonding. Chan, Lee and Nicolella et al [7] studied the near-tip fracture processes of nanocomposites under cyclic loads.…”

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Energy Dissipation Criteria for Surface Contact Damage Evaluation

Gan¹

2012

Continuum Mechanics - Progress in Fundamentals and Engineering Applications

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IntroductionThis chapter presents the energy dissipation approach for analyzing surface contact damages in various materials, including composite materials. As known, surface contact is a very common phenomenon, which can be found in daily life and many scientific and engineering problems. The contact of different bodies can be modeled as indentation. Analysis of indentation and modeling of the deformation states of indented materials are often difficult because of the complexity of stress distributions within indentation zones. It is a l s o v e r y d i f f i c u l t t o e v a l u a t e s t r e s s s t a t e s i n r e g i o n s u n d e r n e a t h a n i n d e n t e d z o n e . Instrumental indentation has been performed on various materials including composite materials. Experimental studies on indention of coatings and brittle materials have been reported extensively, but the criterion for evaluating the extent of damage is not unified. Ductile materials deform relatively stable in indentation processes. While brittle materials are sensitive to compressive contact loadings in view of the formation of surface cracks. Therefore, it is difficult to find a unified stress or strain based damage criterion to characterize the damage evolution. Energy dissipation analysis may be more accurate to describe the deformation behavior of such materials. Specifically, under wedge indentation, the analysis should be investigated because the stress field has the singularity which limits the applicability of the strength criterion. In this chapter, the load-displacement relations with elastic-plastic responses of the materials associated with the indentation processes will be obtained to calculate the hysteresis energy. Lattice rotation measurement using electron backscatter diffraction (EBSD) technique will be performed in the region ahead of the indenter tip to measure the dimension of the contact damage zone (CDZ) and the results will be used to define the length scales in contact deformation. A unified criterion using the hysteresis energy normalized by the length scales will be established.Damage evolution in composite materials is very sensitive to the interaction of reinforcements and matrices in interface regions. For example, the development of damage in glass particle and fiber reinforced epoxy composite materials is strongly influenced by the interface debonding conditions [1]. However, the exact effect of bonding conditions on the performance of particle filled composite materials is still not fully understood. Kawaguchi and Pearson [2] reported that strong matrix-particle adhesion may lower the fatigue crack propagation resistance. While the studies on Si 3 N 4 nanoparticle filled epoxy composites www.intechopen.com Continuum Mechanics -Progress in Fundamentals and Engineering Applications

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Fatigue crack propagation damaging micromechanisms in ductile cast irons

Cited by 83 publications

References 2 publications

Refinement and fracture mechanisms of as-cast QT700-6 alloy by alloying method

Refinement and fracture mechanisms of as-cast QT700-6 alloy by alloying method

Very High Cycle Fatigue of Two Ductile Iron Grades

Energy Dissipation Criteria for Surface Contact Damage Evaluation

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