GBSM-Ir and Graphene-Iridium Functional Interfaces A Failure-Constrained Material Architecture for Active Magnetohydrodynamic Fusion Systems

This work proposes GBSM-Ir, a graphene-derived structural matrix selectively functionalized with iridium, together with graphene-iridium / Ir-C functional interfaces, as a failure-constrained material architecture for active magnetohydrodynamic fusion systems. The document does not claim experimental synthesis, reactor readiness, or the discovery of a homogeneous bulk graphene-iridium alloy. Instead, it defines a speculative but physically bounded interface architecture intended for post-shielding, blanket-adjacent regions of high-energy fusion systems, where refractory shielding, liquid-metal MHD blankets, structural sensing, energy coupling, and local safety mechanisms must remain functionally coherent under extreme thermal, electromagnetic, fluidic, and diagnostic stress. The architecture formalizes three failure-aware mechanisms: the Interfacial Fatigue Clock D_IF(t), which treats graded interfaces as life-cycle-managed regions; the Multimodal Damage Discriminator, which identifies damage through cross-modal coherence failure rather than scalar amplitude thresholds; and the Basal Reflex Layer, a non-cognitive local hardware safety layer for immediate containment below centralized supervisory control. Version 0.3 integrates recent experimental and theoretical literature on iridium-coated carbon-carbon composites, graphene foam thermal transport, functionally graded plasma-facing materials, structural health monitoring in liquid-metal nuclear environments, and acoustic-emission-based damage discrimination. The result is a constrained conceptual framework for evaluating how graphene-iridium functional interfaces could mediate failure, sensing, and survivability in active MHD fusion architectures.