Study on the characteristics of thermal structural response of full tungsten divertor under ELM-like heat pulse

Hyoseong Gwon; Shinzaburo Matsuda; Ryuta Kasada; Satoshi Konishi; Yoshinori Kawamura

doi:10.1016/j.fusengdes.2015.10.027

Study on the characteristics of thermal structural response of full tungsten divertor under ELM-like heat pulse

Hyoseong Gwon, Shinzaburo Matsuda, Ryuta Kasada, Satoshi Konishi, Yoshinori Kawamura

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Damage cause and mechanism of the tungsten specimen under ELM-like heat pulse were examined by using a Nd:YAG laser experiment assuming the ITER divertor allowable heat load, 0.5 MJ/m² and finite-element analysis in terms of thermal mechanical response. The thermal stress distribution with the heat load area was compared by FEM and the stress distribution by a Nd:YAG laser corresponded to that expected in the actual divertor target. The crack growth direction was changed from a perpendicular to parallel and this was caused by the thermal stress distribution in isotropic microstructure under ELM-like heat pulse. In addition the change of crack growth direction caused the deterioration of thermal conduction near the surface and it led to the local surface melting near cracks even at 0.51 MJ/m² with 3000 heat load cycles.

Original language	English
Pages (from-to)	1697-1700
Number of pages	4
Journal	Fusion Engineering and Design
Volume	109-111
DOIs	https://doi.org/10.1016/j.fusengdes.2015.10.027
Publication status	Published - 2016 Nov 1
Externally published	Yes

Keywords

Crack growth
Divertor
ELM-like heat pulse
Tungsten

ASJC Scopus subject areas

Civil and Structural Engineering
Nuclear Energy and Engineering
Materials Science(all)
Mechanical Engineering

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10.1016/j.fusengdes.2015.10.027

Cite this

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title = "Study on the characteristics of thermal structural response of full tungsten divertor under ELM-like heat pulse",

abstract = "Damage cause and mechanism of the tungsten specimen under ELM-like heat pulse were examined by using a Nd:YAG laser experiment assuming the ITER divertor allowable heat load, 0.5 MJ/m2 and finite-element analysis in terms of thermal mechanical response. The thermal stress distribution with the heat load area was compared by FEM and the stress distribution by a Nd:YAG laser corresponded to that expected in the actual divertor target. The crack growth direction was changed from a perpendicular to parallel and this was caused by the thermal stress distribution in isotropic microstructure under ELM-like heat pulse. In addition the change of crack growth direction caused the deterioration of thermal conduction near the surface and it led to the local surface melting near cracks even at 0.51 MJ/m2 with 3000 heat load cycles.",

keywords = "Crack growth, Divertor, ELM-like heat pulse, Tungsten",

author = "Hyoseong Gwon and Shinzaburo Matsuda and Ryuta Kasada and Satoshi Konishi and Yoshinori Kawamura",

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year = "2016",

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doi = "10.1016/j.fusengdes.2015.10.027",

language = "English",

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TY - JOUR

T1 - Study on the characteristics of thermal structural response of full tungsten divertor under ELM-like heat pulse

AU - Gwon, Hyoseong

AU - Matsuda, Shinzaburo

AU - Kasada, Ryuta

AU - Konishi, Satoshi

AU - Kawamura, Yoshinori

PY - 2016/11/1

Y1 - 2016/11/1

N2 - Damage cause and mechanism of the tungsten specimen under ELM-like heat pulse were examined by using a Nd:YAG laser experiment assuming the ITER divertor allowable heat load, 0.5 MJ/m2 and finite-element analysis in terms of thermal mechanical response. The thermal stress distribution with the heat load area was compared by FEM and the stress distribution by a Nd:YAG laser corresponded to that expected in the actual divertor target. The crack growth direction was changed from a perpendicular to parallel and this was caused by the thermal stress distribution in isotropic microstructure under ELM-like heat pulse. In addition the change of crack growth direction caused the deterioration of thermal conduction near the surface and it led to the local surface melting near cracks even at 0.51 MJ/m2 with 3000 heat load cycles.

AB - Damage cause and mechanism of the tungsten specimen under ELM-like heat pulse were examined by using a Nd:YAG laser experiment assuming the ITER divertor allowable heat load, 0.5 MJ/m2 and finite-element analysis in terms of thermal mechanical response. The thermal stress distribution with the heat load area was compared by FEM and the stress distribution by a Nd:YAG laser corresponded to that expected in the actual divertor target. The crack growth direction was changed from a perpendicular to parallel and this was caused by the thermal stress distribution in isotropic microstructure under ELM-like heat pulse. In addition the change of crack growth direction caused the deterioration of thermal conduction near the surface and it led to the local surface melting near cracks even at 0.51 MJ/m2 with 3000 heat load cycles.

KW - Crack growth

KW - Divertor

KW - ELM-like heat pulse

KW - Tungsten

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VL - 109-111

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JO - Fusion Engineering and Design

JF - Fusion Engineering and Design

ER -

Study on the characteristics of thermal structural response of full tungsten divertor under ELM-like heat pulse

Abstract

Keywords

ASJC Scopus subject areas

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