Investigation of cracking behaviors in divertor armor-blocks under cyclic loading

Kim, Dong-Hyun; Je, Sang Yun; Chang, Yoon‐Suk

doi:10.1016/j.fusengdes.2021.112464

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…Damage evolution can be studied using one of the six criteria: maximum principal stress (MAXPS), maximum principal strain (MAXPE), maximum nominal stress (MAXS), maximum nominal strain (MAXE), quadratic nominal stress (QUADS), and quadratic nominal strain (QUADE). Among these, MAXPS is commonly used to simulate crack growth [21][22][23][24]. Phantom nodes are generated when the MAXPS of the elements equals the cohesive strength (T 0 ).…”

Section: Xfem and Multi-island Genetic Algorithmmentioning

confidence: 99%

Evaluation of Fracture Properties of Two Metallic Materials under Hydrogen Gas Conditions by Using XFEM

Kim

Park

Chang

et al. 2022

Metals

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Interest in hydrogen energy is increasing due to its eco-friendliness and ease of use. Research is being conducted to produce and use hydrogen in various fields such as hydrogen vehicles and nuclear power plants. However, considering the purity requirements and the need for containment, experiments with hydrogen have several constraints, such as accounting for the charging and purging time. In this study, the effects of hydrogen gas on the fracture properties of T6 heat-treated 6061 aluminum alloy (Al6061-T6) and Chromium-molybdenum steel (SA372) were investigated using the extended finite element method (XFEM). First, numerical analyses for smooth and notched slow strain rate tensile test specimens under air and hydrogen gas conditions were conducted using a multi-island genetic algorithm and XFEM to derive true stress–strain data and damage parameters of the two materials based on experimental results. Second, the fracture resistance curves of ½T-compact tension (CT) specimens made of SA372 steel were determined by crack growth analyses using the calibrated parameters. The estimated JQ values were compared with those from experiments to validate the method, of which differences were less than 20%. Finally, the fracture properties of Al6061-T6 alloy were predicted using the same method with ½T-CT specimens.

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Section: Xfem and Multi-island Genetic Algorithmmentioning

confidence: 99%

Evaluation of Fracture Properties of Two Metallic Materials under Hydrogen Gas Conditions by Using XFEM

Kim

Park

Chang

et al. 2022

Metals

Self Cite

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“…Meanwhile, in the case of fusion reactor applications, W armors are likely to be subjected to exposure at high temperatures and thermal cycles [ 7 ]. Therefore, the surface temperature of W armors in fusion reactors is likely to reach high temperatures, exceeding the recrystallization temperature of W, leading to a change in microstructure [ 16 , 17 , 18 ]. In addition, thermal shock events would be imposed on W mono-blocks during transient operation, such as plasma disruption or edge-localized modes, which deposit high-heat loads to the divertor surface in a short duration [ 13 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Strain-Rate Dependence of Tensile Behavior in Commercial-Grade Tungsten—Effect of Recrystallization Condition

Kong

Shin

et al. 2022

Materials

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The tensile deformation behavior of double-forged (DF-W) and recrystallized (RX-W) commercial-grade tungsten was investigated at 700 °C. With increasing strain rate, the dominant dynamic recrystallization (DRX) mechanism changes from continuous dynamic recrystallization (CDRX) to discontinuous dynamic recrystallization (DDRX). For DF-W, pre-existing sub-grains promote CDRX and associated a high-DRX fraction, resulting in reduced post-necking strain under a static condition. With increasing strain rate, a shift in the restoration mechanism from CDRX to DDRX contributes to the enhanced ductility in DF-W, while RX-W shows enhanced flow hardening without a loss of ductility. These results suggest that the strain-rate dependence of mechanical behavior depends on the initial microstructure.

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Investigation of cracking behaviors in divertor armor-blocks under cyclic loading

Cited by 2 publications

References 16 publications

Evaluation of Fracture Properties of Two Metallic Materials under Hydrogen Gas Conditions by Using XFEM

Evaluation of Fracture Properties of Two Metallic Materials under Hydrogen Gas Conditions by Using XFEM

Strain-Rate Dependence of Tensile Behavior in Commercial-Grade Tungsten—Effect of Recrystallization Condition

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