Interface Tension Action / Rice J-Integral

Interface Tension Action borrows the Rice J-Integral — a path-independent measure of the energy available to drive a crack at a material interface in fracture mechanics — to quantify the stress concentrated at boundaries within a building's fabric and at the organism–substrate interface. It measures how close a junction (render-to-masonry, coating-to-substrate, biofilm-to-stone) is to its failure threshold, feeding the susceptibility-tension coupling that predicts where disturbances propagate and where degradation will localise.