Development of a remote-controlled fatigue test machine using a laser extensometer for investigation of irradiation effect on fatigue properties

Yonekawa, Minoru; Ishii, Toshiaki; Ohmi, Masao; Takada, Fumiki; Hoshiya, Taiji; Niimi, Motoji; Ioka, Ikuo; Miwa, Yukio; Tsuji, Hirokazu

doi:10.1016/s0022-3115(02)01074-7

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…Fins were formed at the both ends of the gage section of the fatigue specimen. They were used to measure the axial stains by the laser extensometer during the tests [11,12]. For tensile tests, sheet type specimens with 7.86 mm gage length, 1.54 mm width and 0.76 mm thickness were also prepared from the material.…”

Section: Methodsmentioning

confidence: 99%

Fatigue properties of F82H irradiated at 523 K to 3.8 dpa

Miwa¹,

Jitsukawa²,

Yonekawa³

2004

Journal of Nuclear Materials

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Section: Methodsmentioning

confidence: 99%

Fatigue properties of F82H irradiated at 523 K to 3.8 dpa

Miwa¹,

Jitsukawa²,

Yonekawa³

2004

Journal of Nuclear Materials

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“…For example Ioka et al [36,37] examined 304 stainless steel in LCF using specimens of 4 mm diameter and 6 mm gauge length in vacuum at a temperature of 550 C. Laser extensometry was utilised to measure strains on the irradiated samples. There are also instances where environments, even though inert, would be impractical to introduce into a large chamber.…”

Section: Justification For Indirect Methodsmentioning

confidence: 99%

Direct and indirect strain measurement during low cycle fatigue of metals at elevated temperature

Skelton¹

2011

Materials at High Temperatures

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Current testing practices in low cycle fatigue (LCF) determinations at elevated temperature recommend the use of side-contacting extensometers or other direct methods for the measurement of strain. In many cases (e.g., when an environmental chamber surrounds the test specimen) this is not possible and resort must be had to indirect methods, which require a correction factor depending on the cyclic stress -strain response of the material. By mounting direct and indirect extensometers on the specimen and grip assembly of the testing machine, direct comparisons were made on the output strain signals during LCF tests on alloys 316, Nimonic 90 and IN718 at temperatures in the range 600 -900 C. Agreement for plastic strain range was in general good, the remote method however requiring an independent value of the elastic modulus for determination of total strain range. Typical uncertainties in these values are discussed. All comparisons were made under continuous cycling conditions and a correction factor for use under creep-fatigue conditions is suggested.

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“…However, the technique is time taking and uneconomical when the number of samples are high. Indirect techniques of measuring strain, such as the use of laser and video extensometer, Digital Image Co-relation (DIC), provide quick and effective strain measurements and therefore, they are widely used in the fields of mechanical, metallurgical and civil engineering [18][19][20][21][22][23][24]. However, the study on the use of laser extensometer in understanding the geomechanical properties of rock is limited.…”

Section: Introductionmentioning

confidence: 99%

Elastic modulus of thermally treated fine grained sandstone using non-contact laser extensometer

Sirdesai¹,

Mahanta²,

Ranjith³

et al. 2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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Abstract-Processes such as Underground Coal Gasification (UCG), Enhanced Oil Recovery (EOR) and underground disposal of nuclear waste involve the exposure of the surrounding rocks to extreme temperatures. At such high temperatures, the rock suffers substantial structural damage due to the anisotropy in the geotechnical properties of its constituent minerals. Due to variable thermal expansion within minerals, thermal stresses are generated in the rock microstructure which cause change in the fracture pattern. New cracks may develop and pre-existing one may migrate and widen further; thereby reducing the mechanical strength of the rock. In this study, an attempt has been made to study the elastic modulus of thermally treated fine grained sandstone from the Dholpur district of Rajasthan. The elastic modulus was measured by using a MTS LX-Laser Extensometer. The rock specimens were thermally treated at various temperatures for a fixed duration. The change in the rock microstructure was studied viewing the rock specimen under a scanning electron microscope.

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Development of a remote-controlled fatigue test machine using a laser extensometer for investigation of irradiation effect on fatigue properties

Cited by 7 publications

References 8 publications

Fatigue properties of F82H irradiated at 523 K to 3.8 dpa

Fatigue properties of F82H irradiated at 523 K to 3.8 dpa

Direct and indirect strain measurement during low cycle fatigue of metals at elevated temperature

Elastic modulus of thermally treated fine grained sandstone using non-contact laser extensometer

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