Limits RegistryPUBLIC RECORD
Limits RegistryHigh-toughness structural steels can reach plane-strain fracture toughness values above 200 MPa√m under qualified testing conditions.
The question, scope, and sources behind this Registry record.
High-toughness structural steels can reach plane-strain fracture toughness values above 200 MPa√m under qualified testing conditions.
Track the highest qualified K_IC reported for a structural steel using a standardized thick-specimen fracture test.
Fracture toughness is not a single material constant independent of geometry: it depends on constraint, temperature, thickness, microstructure, and loading rate. This record tracks a qualified engineering frontier rather than a universal bound.
Materials science data and standards — Fracture toughness frontier for structural steelChange a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
Current frontiers derived from accepted Claims.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
Permanent ID limitsregistry.com/limits/LR-004203
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Limits Registry. LR-004203. Fracture toughness frontier for structural steel. 2026.