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• Cryogenic testing: Overcoming challenges in the characterization of irradiated composite materials for Nuclear Fusion

  A. Carpio Rovira, B. PAlenzuela, D. Galdeano, I. Santillana, F. Ortona

  Materiales Compuestos (Online first).

  
  

  Abstract

  This work describes the collaboration between ITER, CERN and APPLUS LABORATORIES to develop and validate innovative methodologies for the mechanical characterization of advanced epoxy-based composite materials with fiberglass reinforcement under cryogenic conditions (77 K) post-irradiation. These materials were selected for critical applications in the ITER reactor due to their combination of dielectric properties and mechanical behavior, requiring them to maintain structural integrity under extreme conditions of neutron irradiation (up to 10 MGy). The research faced significant challenges related to specimen slippage in test grips, especially critical in irradiated materials that experience embrittlement. To overcome this problem, an innovative system was developed based on a flexible liquid nitrogen repository that allows maintaining the central area of the specimen at 77 K while using conventional hydraulic grips at room temperature to hold the ends. Three different materials (A, B, and C) with various fiber configurations and testing methodologies adapted to each case were analyzed. The developed system proved to be fundamental for obtaining valid results in materials susceptible to slippage, combining the advantages of conventional hydraulic grips with precise temperature control in the test area. The methodologies and solutions developed have significant implications for establishing future standardized testing protocols for materials used in nuclear fusion applications, reducing the need for large specialized facilities and potentially accelerating materials qualification programs for future fusion facilities.

  Abstract
  This work describes the collaboration between ITER, CERN and APPLUS LABORATORIES to develop and validate innovative methodologies for the mechanical characterization of advanced [...]

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