T2: Claim-Gated Multiscale Audit of Graphene Thermal Interface Formulations: From Composition-Space Traceability to System-Level Identifiability Limits

Research question

Which formulation claims survive a sequential multiscale audit, and can a bulk prediction be identified from assembled-joint observations without independently constrained bond-line thickness and contacts?

MODEL SCOPE

Public model description

Anonymous mass-composition vectors and engineering density priors define a volume-composition audit. Effective-medium relations and packing constraints precede stochastic 2D and coarse-grained 3D transport surrogates. Constitutive/interface uncertainty and a matched platelet-only counterfactual qualify bulk claims. At TIM level, a symbolic steady series model separates two contact contributions from thickness divided by apparent bulk conductivity; their trade-offs create the stated identification barrier.

PROTOCOL

Declared evidence chain

Seven stages retain extrapolative traceability, effective-medium compatibility, split packing risk, orientation sensitivity, solver corrections, targeted 3D-resolution closure, conditional bulk targets, negative hybrid ablation, and the terminal thickness/contact gate. Failed early numerical branches are preserved rather than used as successful thermal evidence. The corrected public edition consolidates categorical outcomes without new numerical runs or laboratory observations.

Series: T2.1–T2.7 · composition · packing · 2D/3D RVE · matched ablation · BLT/contact identification

• T2.1–T2.7
• composition
• packing
• 2D/3D RVE
• matched ablation
• BLT/contact identification

The labels below preserve the public protocol identity. They are an index to the publication, not a substitute for its full methods or an open reproducibility bundle.

EVIDENCE

Results inside the model

1. Candidates A and B retain conditional bulk-target compatibility after the declared controls; Candidate C does not reach the target in the tested screen. Candidate A combines that conditional result with a clear packing margin, while B and C remain jamming-sensitive.
2. Every proposed candidate lies outside the supplied reference volume-composition hull. Effective-medium compatibility is supported within declared assumptions, but it does not establish measured conductivity or processability.
3. The tested 2D ensemble is orientation-sensitive and has no detected continuous FLG-only through-span. Earlier solver and 3D-transfer failures remain in the evidence record; downstream interpretation uses the later numerical-closure lineage within its surrogate scope.
4. The matched platelet-only counterfactual outperforms the full hybrid in every proposed-candidate branch. Hybrid superiority is not supported against this comparator; this does not universally exclude hybrid mechanisms or recommend a manufactured platelet-only paste.
5. Available system evidence does not identify paste conductivity without independent bond-line thickness and contact constraints. The report supports a conditional testing priority, not a validated formulation, TIM joint, or device benchmark.

BOUNDARY

CLAIM BOUNDARY

Numerical evidence is not physical validation. Transfer to a material, device, organism, environment, or operational service requires a separate validation chain whenever such a transfer is relevant.

Publication record