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

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:
 [1] ; ORCiD logo [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4]
  1. National Institutes for Quantum and Radiological Science and Technology, Aomori (Japan)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Hokkaido Univ., Hokkaido (Japan)
  4. Japan Atomic Energy Agency, Ibaraki (Japan)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; NFE-19-02779
Type:
Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 16; Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Reduced activation ferritic/martensitic steel; Oxide dispersion strengthened steel; Post irradiation experiment; Small specimen technology; Tensile test; Strain
OSTI Identifier:
1457504
Alternate Identifier(s):
OSTI ID: 1462890

Sakasegawa, Hideo, Chen, Xiang, Kato, Taichiro, Tanigawa, Hiroyasu, Ando, Masami, Geringer, Josina Wilna, Ukai, Shigeharu, and Ohtsuka, Satoshi. Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels. United States: N. p., Web. doi:10.1016/j.nme.2018.06.005.
Sakasegawa, Hideo, Chen, Xiang, Kato, Taichiro, Tanigawa, Hiroyasu, Ando, Masami, Geringer, Josina Wilna, Ukai, Shigeharu, & Ohtsuka, Satoshi. Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels. United States. doi:10.1016/j.nme.2018.06.005.
Sakasegawa, Hideo, Chen, Xiang, Kato, Taichiro, Tanigawa, Hiroyasu, Ando, Masami, Geringer, Josina Wilna, Ukai, Shigeharu, and Ohtsuka, Satoshi. 2018. "Strain evaluation using a non-contact deformation measurement system in tensile tests of irradiated F82H and 9cr ODS steels". United States. doi:10.1016/j.nme.2018.06.005.
@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 Wilna 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 = {United States},
year = {2018},
month = {6}
}