Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels

Sakasegawa, Hideo; Chen, Xiang; Kato, Taichiro; Tanigawa, Hiroyasu; Ando, Masami; Geringer, Josina W.; Ukai, Shigeharu; Ohtsuka, Satoshi

doi:10.1016/j.nme.2018.06.005

Title: Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels

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Abstract

Here, we developed a non-contact deformation measurement system to accurately evaluate strain for post irradiation tensile testing, since conventional strain gages cannot be used for small size specimens. The strain calculated from cross-head displacement generally includes deformation from specimen shoulders, fixtures, and the test frame in addition to the deformation from the specimen gauge section. In our system, the distance between painted marks within the specimen gauge section was measured using a high resolution video camera to evaluate the specimen deformation during room temperature tensile testing. The test materials were F82H and 9Cr ODS steels irradiated up to ≈71 displacements per atom (dpa) at about 573 K in High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). Our system yielded accurate stress strain curves without deformations other than the specimen gage section, and the elongation was less than that calculated from cross-head displacement. This system can contribute to expanding the technically reliable database for the design activity of fusion reactor blanket, including the effects of irradiation on tensile properties.

Authors:

Sakasegawa, Hideo;

; Kato, Taichiro; Tanigawa, Hiroyasu; Ando, Masami; Geringer, Josina W.; Ukai, Shigeharu; Ohtsuka, Satoshi

Publication Date:: 2018-08-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1457504

Alternate Identifier(s):: OSTI ID: 1462890

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Published Article

Journal Name:: Nuclear Materials and Energy

Additional Journal Information:: Journal Name: Nuclear Materials and Energy Journal Volume: 16 Journal Issue: C; Journal ID: ISSN 2352-1791

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 36 MATERIALS SCIENCE; Reduced activation ferritic/martensitic steel; Oxide dispersion strengthened steel; Post irradiation experiment; Small specimen technology; Tensile test; Strain

Citation Formats


                    Sakasegawa, Hideo, Chen, Xiang, Kato, Taichiro, Tanigawa, Hiroyasu, Ando, Masami, Geringer, Josina W., Ukai, Shigeharu, and Ohtsuka, Satoshi. Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels.  Netherlands: N. p., 2018. 
Web.  doi:10.1016/j.nme.2018.06.005.

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                    Sakasegawa, Hideo, Chen, Xiang, Kato, Taichiro, Tanigawa, Hiroyasu, Ando, Masami, Geringer, Josina W., Ukai, Shigeharu, & Ohtsuka, Satoshi. Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels.  Netherlands.  https://doi.org/10.1016/j.nme.2018.06.005

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                    Sakasegawa, Hideo, Chen, Xiang, Kato, Taichiro, Tanigawa, Hiroyasu, Ando, Masami, Geringer, Josina W., Ukai, Shigeharu, and Ohtsuka, Satoshi. Wed .  
"Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels".  Netherlands.  https://doi.org/10.1016/j.nme.2018.06.005.

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@article{osti_1457504,

  title        = {Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels},

  author       = {Sakasegawa, Hideo and Chen, Xiang and Kato, Taichiro and Tanigawa, Hiroyasu and Ando, Masami and Geringer, Josina W. and Ukai, Shigeharu and Ohtsuka, Satoshi},

  abstractNote = {Here, we developed a non-contact deformation measurement system to accurately evaluate strain for post irradiation tensile testing, since conventional strain gages cannot be used for small size specimens. The strain calculated from cross-head displacement generally includes deformation from specimen shoulders, fixtures, and the test frame in addition to the deformation from the specimen gauge section. In our system, the distance between painted marks within the specimen gauge section was measured using a high resolution video camera to evaluate the specimen deformation during room temperature tensile testing. The test materials were F82H and 9Cr ODS steels irradiated up to ≈71 displacements per atom (dpa) at about 573 K in High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). Our system yielded accurate stress strain curves without deformations other than the specimen gage section, and the elongation was less than that calculated from cross-head displacement. This system can contribute to expanding the technically reliable database for the design activity of fusion reactor blanket, including the effects of irradiation on tensile properties.},

  doi          = {10.1016/j.nme.2018.06.005},

  journal      = {Nuclear Materials and Energy},

  number       = C,

  volume       = 16,

  place        = {Netherlands},

  year         = {2018},

  month        = {8}

}

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