Numerical Evaluation of Crack Propagation of ITER First Wall with an Initial Interfacial Defect

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  • 界面初期欠陥を有する ITER 用第一壁の亀裂進展の評価
  • カイメン ショキ ケッカン オ ユウスル ITERヨウ ダイ1 ヘキ ノ キレツ シンテン ノ ヒョウカ

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Abstract

  The first wall of the International Thermonuclear Experimental Reactor (ITER) will be fabricated by means of the Hot Isostatic Pressing (HIP) method for the bonding of cooling tubes and a copper alloy heat sink. A ultrasonic testing (UT) is adopted as a non-destructive inspection method for the bonding interface as one of the acceptance tests of the first wall components. Therefore, clarification of a defect size criteria is one of the critical issues for the soundness of the first wall. In this paper, a thermo-mechanical behavior of an initial defect at the bonded interface of the ITER first wall was numerically analyzed. An elastoplastic fracture mechanical parameter, J-integral, was calculated to evaluate the propagation behavior of the interfacial defects under thermal loading. As a result, it was found that the initial defect size of 10 mm×20 mm in semi-elliptic shape was unlikely to propagate under the thermal loading of ITER. This defect size is more than ten times larger than a detection limit of present UT techniques, and it can be resulted that the UT method presently available is sufficient to detect such harmful initial defects of the ITER first wall.<br>

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