Experimental and Numerical Investigation of Fatigue Behaviour of Nodular Cast Iron

Čanžar, Predrag; Tonković, Zdenko; Bakić, Ante; Kodvanj, Janoš

doi:10.4028/www.scientific.net/kem.488-489.182

Cited by 7 publications

(13 citation statements)

References 6 publications

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“…Furthermore, comparing corresponding hysteresis loops for the symmetrical and unsymmetrical tests, it can be concluded that mean strain has no significant effect on the cyclic hardening behaviour of the investigated materials. The presented results represent the basis for determination of material parameters of a cyclic plasticity constitutive model like that recently developed by Tonković and Sorić [20][21][22] and damage criterions based on the stabilised accumulated inelastic hysteresis strain energy [22].…”

Section: Uniaxial Monotonic Tensile and Cycle Testsmentioning

confidence: 91%

Microstructure influence on fatigue behaviour of nodular cast iron

Čanžar

Tonković

Kodvanj

2012

Materials Science and Engineering: A

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a b s t r a c tThe present paper evaluates the fatigue life of ductile nodular cast iron EN-GJS-400-18LT with four different microstructures. Characterisation of the graphite morphology and the matrix microstructure is performed on 50 samples for every material type. Tensile stress-strain curves, symmetrical and unsymmetrical stress-strain hysteresis loops, cyclic stress-strain curves, crack resistance curves and fatigue life curves of these four microstructures are obtained. Experimental results show that size, shape and distribution of the graphite nodules has no significant influence on cyclic hardening of the material but they play a great role in the crack initiation and propagation process. It is shown that the larger irregularly shaped nodules reduce fracture toughness and fatigue strength. Furthermore, the results demonstrated that pearlitic phase does not strongly affect fatigue life if its proportion does not exceed 10%. The monitoring of crack length during the tests is performed by an optical method developed in the present work.

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Section: Uniaxial Monotonic Tensile and Cycle Testsmentioning

confidence: 91%

Microstructure influence on fatigue behaviour of nodular cast iron

Čanžar

Tonković

Kodvanj

2012

Materials Science and Engineering: A

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“…Material properties of nodular cast iron are well elaborated in previous authors' paper [6,7]. An algorithm which enables numerical modelling of cyclic plasticity behaviour of nodular cast iron is proposed by Čanžar in [8]. The present paper is a continuation of that study where the fatigue damage in the specimen near the notch and the crack tip is analysed in detail for more accurate predictions.…”

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

confidence: 87%

“…Moreover, comparing corresponding hysteresis loops for the symmetric and asymmetric tests, it may be concluded that mean strain has no significant effect on the cyclic hardening behaviour of the considered material. More data can be found in [8].…”

Section: Uniaxial Cycle Testsmentioning

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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“…In cast iron, process‐related material defects often cannot be avoided. The influence of those defects on fatigue strength of nodular cast iron is investigated 14–20 . In this paper, the focus of the investigations is to determine the influence of the transient material behavior on the calculated damage sum.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of those defects on fatigue strength of nodular cast iron is investigated. [14][15][16][17][18][19][20] In this paper, the focus of the investigations is to determine the influence of the transient material behavior on the calculated damage sum. The influence of defects on fatigue properties was not investigated in this work; therefore, specimens containing major discontinuities were not considered in the evaluation.…”

Section: Introductionmentioning

confidence: 99%

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Hesseler

Baumgartner

Bleicher

2021

Fatigue Fract Eng Mat Struct

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The consideration of realistic load assumptions is important for the fatigue design of highly stressed nodular cast iron components for wind energy application. Especially in case of overloads causing elastic–plastic deformation, residual stresses may have a strong impact on fatigue life. In strain‐controlled fatigue tests with constant and variable amplitudes, the influence of overloads on lifetime was investigated. During fatigue testing, the transient material behavior, cyclic hardening, cyclic relaxation of the residual stresses, and quasi‐static creep effects of the EN‐GJS‐400‐18‐LT was recorded and evaluated. To quantify the influence of the transient material behavior on the calculated lifetime, fatigue analyses are carried out with the strain‐life approach, both with and without consideration of the transient material behavior. The results show that conservative damage sums are derived if the transient material behavior, especially the relaxation of tensile residual stresses, is neglected.

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Experimental and Numerical Investigation of Fatigue Behaviour of Nodular Cast Iron

Cited by 7 publications

References 6 publications

Microstructure influence on fatigue behaviour of nodular cast iron

Microstructure influence on fatigue behaviour of nodular cast iron

Crack Tip Position Determination Using Infrared Thermography and Digital Image Correlation

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

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