Deformation characteristics of nuclear grade graphites

Gillin, L. Murray

doi:10.1016/0022-3115(67)90160-2

Cited by 8 publications

(13 citation statements)

References 11 publications

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“…This phenomenon is displayed in Figure 8 for εp = 0.66 ± 0.01 at temperature levels of 373 K, 773 K and 973 K. For the higher temperature 1073 K, the nodules are almost spherical in shape for a plastic deformation of εp = 0.60. It is known that the mechanical properties of the ferrite are strongly dependent on the temperature [41][42][43], unlike those of the graphite in this temperature range [44][45][46]. The yielding stress and the ultimate strength of the ferrite remain higher than those of graphite between RT and 773 K. Beyond this temperature, the difference between the mechanical properties of ferrite and graphite is reduced until the graphite properties become greater than the ferrite ones.…”

Section: Nodule Deformation After Compression Tests With Temperaturementioning

confidence: 99%

“…First, the typical mechanical behavior of a mild ferritic steel and graphite for tensile and compression tests carried out at low and high temperatures is schematically represented in Figure 9. In this graph, the mechanical properties of graphite nodules were assumed to be similar to those of polycrystalline graphite reported in the literature for a wide range of temperature [44][45][46]. An extrapolation of the corresponding graphite stress-strain curve is used to estimate the graphite mechanical properties for higher equivalent strain values.…”

Section: Synthesis Of the Tension-compression Damage Mechanisms As A mentioning

confidence: 99%

“…Figure 9. Schematic mechanical properties of the ferrite and graphite as a function of temperature (after data given in [41][42][43][44][45][46][47][48]). …”

Section: Synthesis Of the Tension-compression Damage Mechanisms As A mentioning

confidence: 99%

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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: Nodule Deformation After Compression Tests With Temperaturementioning

confidence: 99%

Section: Synthesis Of the Tension-compression Damage Mechanisms As A mentioning

confidence: 99%

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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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“…The increasing interest in the use of graphite as a high temperature structural material is also demonstrated by the numerous investigations on high-temperature mechanical and thermal properties of this material. Greenstreet [7] , Green [8] and Price [9] presented a review about the published mechanical properties data for artificial graphite; Malmstrom et al [10] and Wagner et al [11] analysed some mechanical properties at high temperature; Smith [12] and Martens et al [13] tested high temperature tensile strength, while Green [14] and Gillin [15] performed compressive tests over 2000 °C.…”

Section: Introductionmentioning

confidence: 99%

“…Even though many quantitative tensile test data are available, only Green [14] and Gillin [15] presented experimental results regarding the high temperature compressive strength of some anisotropic graphite. Moreover, the strength proved to be strictly dependent on the particular type of graphite.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Compression Tests of A Commercial Isotropic Ultrafine Grain Graphite

Centofante

Monett

Meneghetti

2020

Advanced Materials Science and Technology

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Graphite is often used to design components working at high temperature in a variety of industrial and research environments. It is therefore important to know the mechanical resistance of this material at high temperature. This work reports the compressive strength up to 2000 °C of an isotropic ultrafine grain graphite, the POCO EDM-3, which has not been analysed in the literature yet. This graphite is used to design components able to withstand extreme environmental conditions, due to the properties resulting from the uniform and isotropic microstructure of the material. A vacuum compression test equipment was developed, able to work above 2000 °C. Both cylindrical and hourglass-shaped specimens were tested and the influence of density was also evaluated. The influence of the materials in contact with the specimen ends was also analysed, but a negligible dependence was observed. The tests demonstrated that the compressive strength increases as the density and the temperature increase: at 2000 °C a 22% average increase of the compressive strength over its room-temperature value was noted.

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Bend strength of graphite under pressure

Boey¹,

Bacon²

1986

Carbon

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Deformation characteristics of nuclear grade graphites

Cited by 8 publications

References 11 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

High Temperature Compression Tests of A Commercial Isotropic Ultrafine Grain Graphite

Bend strength of graphite under pressure

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