New flow rules in elasto-viscoplastic constitutive models for spheroidal graphite cast-iron

Szmytka, Fabien; Rémy, Luc; Maïtournam, Habibou; Köster, Alain; Bourgeois, Myriam

doi:10.1016/j.ijplas.2009.11.007

Cited by 49 publications

(27 citation statements)

References 66 publications

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“…Nodule deformation progressively decreases, and their shape remains almost spherical inside large cavities after the tensile test carried out at 1073 K. Voids coalescence can be observed for these temperatures. The viscoplastic behavior of DCI previously highlighted by Szmytka et al [4] for temperatures higher than 773 K is confirmed in this work in terms of damage mechanism evolution.…”

Section: Evolution Of the Damage Mechanisms With Temperature In Plastsupporting

confidence: 88%

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Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued from the Gurson model representing the void growth as a function of the deformation and temperature was successfully employed. It is demonstrated that the strain state and the temperature have a strong influence on the void growth function. In the case of compression tests, the temperature has a weak influence on the nodule deformation for temperatures lower than 773 K, and the mechanical behavior is driven by the viscoplastic properties of the ferrite. For higher temperatures, the mechanical properties in compression are progressively modified, since graphite nodules tend to remain spherical, and ferrite grains are severely deformed. A synthesis of the damage mechanisms is proposed in the studied range of temperature and plastic strain. It appears that the graphite nodule aspect ratio can be used OPEN ACCESSMetals 2015, 5 2352 as an indicator of the deformation under compression loading for temperatures ranging from room temperature to 673 K.

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Section: Evolution Of the Damage Mechanisms With Temperature In Plastsupporting

confidence: 88%

“…Damage and fracture of DCI were exhaustively studied at ambient temperature, especially in the case of cyclically-loaded components [2][3][4]. The ductile fracture of DCI is usually explained in terms of nucleation, growth and coalescence of voids.…”

Section: Introductionmentioning

confidence: 99%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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“…During the last few decades, this model was improved extensively to better describe creep-fatigue interaction, inverse rate sensitivity [11], multiaxial ratchetting [28] or time recovery effects [16].…”

Section: Isothermal Fatigue Testsmentioning

confidence: 99%

“…In the literature, these models are identified from fatigue test results performed on specimen shapes similar to industrial components [4] or obtained by appropriate heat treatments [15]. Macroscopic mechanical models used are known to be cost effective [16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical fatigue behaviour of welded tubular parts made of ferritic stainless steel

Robin

Delagnes

Logé

et al. 2013

International Journal of Fatigue

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“…Other examples of phenomenological constitutive models applied to cast iron are empirical approaches within classical plasticity theory, such as for instance the Drucker-Prager yield function [109][110][111], semi-empirical modelling approaches [112], state variable modelling approaches [113] and multilayer model approaches [114].…”

Section: Constitutive Modellingmentioning

confidence: 99%

Fatigue of Heavy-Vehicle Engine Materials: Damage Mechanisms, Laboratory Experiments and Life Estimation

Norman¹

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Due to increasing demands on sustainability exerted by end-costumers and policy makers, heavy-vehicle manufacturers are urged to increase the engine efficiency in order to reduce the exhaust gas emission. However, increasing the efficiency is also associated with an elevated fatigue rate of the materials constituting the engine parts, which consequently reduces the engine service life. The aim of the present thesis is therefore to confront the expected increase by studying the fatigue behaviour and damage mechanisms of the materials typically employed in heavy-vehicle diesel engines. With this knowledge, this work seeks to guide the development of new heavy-vehicle engine materials, as well as to develop improved life estimation methods designated to assist the mechanical design of durable heavy-vehicle engines.In essence, a large set of thermo-mechanical fatigue (TMF) and combined thermo-mechanical and high-cycle fatigue (TMF-HCF) tests is conducted at engine load conditions on laboratory specimens of lamellar, compacted and spheroidal graphite iron. In this way, the fatigue performance and associated damage mechanisms are investigated. In particular, a new fatigue property is identified, the TMF-HCF threshold, which quantifies how resistant a material is to superimposed high-cycle fatigue.The damage mechanism at low temperatures ( 500 o C) is confirmed to consist of the initiation, propagation and coalescence of numerous microcracks. Based on this, a successful fatigue life estimation model is formulated, allowing accurate estimations of TMF and TMF-HCF tests on smooth specimens, and TMF tests on notched specimens. In the latter case, the microcrack growth behaviour in non-uniform cyclic stress fields and its implications for life estimation are clarified. At elevated temperatures ( 500 o C), surface oxidation is shown to govern the fatigue performance of cast iron grades intended for exhaust manifolds. It is observed that oxide intrusions are induced, from which surface fatigue cracks are initiated. Consequently, an optimal material at these conditions should have a low oxide growth rate and few casting defects at the surface, as these factors are found to stimulate the growth of intrusion.iii Populärvetenskaplig sammanfattningMen anledning av ökande krav på hållbarhet från slutkunder och beslutsfattare pressas tillverkare av tunga lastbilar att öka drivlinans verkningsgrad och minska utsläppen av luftföroreningar. För dieselmotorn som är den vanligaste motortypen i tunga lastbilar förväntas i dagsläget det största bidraget till att möta kraven vara att öka motorns verkningsgrad. Högre verkningsgrad innebär lägre bränsleförbrukning, vilket i sin tur står i direkt proportion till mängden utsläppt koldioxid. Denna eftertraktade förbättring åstadkoms generellt genom att öka kompressionsförhållandet, vilket medför en ökning i det maximala förbränningstrycket och temperaturen i förbränningskam-maren. Till följd av detta uppkommer även ett ökat slitage av motorkomponenterna, i tekniska sammahang kallat utma...

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New flow rules in elasto-viscoplastic constitutive models for spheroidal graphite cast-iron

Cited by 49 publications

References 66 publications

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thermo-mechanical fatigue behaviour of welded tubular parts made of ferritic stainless steel

Fatigue of Heavy-Vehicle Engine Materials: Damage Mechanisms, Laboratory Experiments and Life Estimation

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