Modeling and testing miniature torsion specimens for SiC joining development studies for fusion

JOURNAL OF NUCLEAR MATERIALS

卷:466

Article

Henager, C. H., Jr.¹  Nguyen, B. N.¹  Kurtz, R. J.¹  Roosendaal, T. J.¹  Borlaug, B. A.¹  Ferraris, M.²  Ventrella, A.²  Katoh, Y.³ 

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Politecn Torino, Turin, Italy

[3] Oak Ridge Natl Lab, Oak Ridge, TN USA

关键词: SiC;    Fusion materials;    Joining;    Torsion;    Damage model;    Finite element;   

DOI  :  10.1016/j.jnucmat.2015.07.044

来源: Elsevier

【 摘 要 】

The international fusion community has designed a miniature torsion specimen for neutron irradiation studies of joined SiC and SiC/SiC composite materials. Miniature torsion joints based on this specimen design were fabricated using displacement reactions between Si and TiC to produce Ti3SiC2 + SiC joints with SiC and tested in torsion-shear prior to and after neutron irradiation. However, many miniature torsion specimens fail out-of-plane within the SiC specimen body, which makes it problematic to assign a shear strength value to the joints and makes it difficult to compare unirradiated and irradiated strengths to determine irradiation effects. Finite element elastic damage and elastic-plastic damage models of miniature torsion joints are developed that indicate shear fracture is more likely to occur within the body of the joined sample and cause out-of-plane failures for miniature torsion specimens when a certain modulus and strength ratio between the joint material and the joined material exists. The model results are compared and discussed with regard to unirradiated and irradiated test data for a variety of joint materials. The unirradiated data includes Ti3SiC2 + SiC/CVD-SiC joints with tailored joint moduli, and includes steel/epoxy and CVD-SiC/epoxy joints. The implications for joint data based on this sample design are discussed. (C) 2015 Elsevier B.V. All rights reserved.

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