600× stress amplification at low stress
Adaptive threshold processing of pressure-sensitive film images quantitatively captures real contact area and stress distribution in rock joints, revealing contact patch evolution under normal stress.
Geng, Gong · Jia, Pan · Li-Chun, Zhao · Xiong, Feng · Zhang, Guohua · Tang, Zhicheng
Yantu Lixue/Rock and Soil Mechanics 2024
Real contact area ratio increases hyperbolically with normal stress
Joint roughness coefficient JRC positively correlates with initial growth rate of contact area
Roughness impact at high normal stress is about 20 times that at low stress