Abstract: The life safety rope is the core stressed component of the fall protection equipment for fire service. But whether it has plastic deformation that affects the strength of the rope after the overload and fall cannot be judged by visual inspection, touch and other inspection methods during use. The tensile resistance spandex sensing yarn with high elasticity and good strain inductance characteristics is placed inside the safety rope after the spandex filament wrapping and coating process, and the stress transmission can be realized by synchronous force deformation with the rope. The resistance responsiveness and linearity of the sensing life safety rope were tested using a universal tensile tester and resistance acquisition device. The experimental results showed that the stress-strain-resistance signal of the sensing yarn is output lin⁃early in the elastic deformation range. The sensing yarn responds positively to applied tensile loads with a linearity of 0.988 56. In multiple stretching cycles, the sensing yarn has good stability. In the future, it can help firefighters determine the load situation in practice and simplify the calculation of rescue assessment.

Key words: sensing safety rope, tensile resistance sensing yarn, sensing performance analysis