In-plane and out-of-plane constraint effects under pressurized thermal shocks

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Abstract

Transferability of fracture toughness data obtained on small scale specimens to a full-scale cracked structure is one of the key issues in integrity assessment of engineering structures. In order to transfer fracture toughness under different constraints, both in-plane and out-of-plane constraint effect should be considered for the specimens and structures. In this paper both in-plane and out-of-plane constraint effects of a crack in a reference reactor pressure vessel (RPV) subjected to pressurized thermal shocks (PTSs) are analyzed by two-parameter and three-parameter methods. The comparison between elastic and elastic-plastic analysis shows that the constraint effect varies with the material property. T11 (the second term of William's extension acting parallel to the crack plane) generally displays a reversed relation to the stress intensity factor (SIF) with the transient time, which indicates that the loading (SIF) plays an important role on the in-plane constraint effect. The thickness at the crack tip contributes more than the loading to the out-of-plane constraint, such that T33 (the second term of William's extension acting along the thickness) displays a similar relation to ε33 (strain along the thickness direction) and a different relation to T11 during the transient. The results demonstrate that both in-plane and out-of-plane constraint effect should be analyzed separately in order to describe precisely the stress distribution ahead of the crack tip. © 2013 Elsevier Ltd. All rights reserved.

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Qian, G., Gonzalez-Albuixech, V. F., & Niffenegger, M. (2014). In-plane and out-of-plane constraint effects under pressurized thermal shocks. International Journal of Solids and Structures, 51(6), 1311–1321. https://doi.org/10.1016/j.ijsolstr.2013.12.021

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