Stress detection system in flexible two-dimensional structure

A stress detection system in a flexible two-dimensional structure, comprising:

• a flexible two-dimensional structure;
• at least one electrically conductive textile filament, extending over a predetermined length in a portion of the flexible two-dimensional structure and having at least two longitudinally spaced points rigidly constrained to the two-dimensional structure, arranged on the flexible two-dimensional structure in a configuration having two substantially rectilinear parallel portions electrically connected to each other;
• and
• an apparatus for generating and detecting an electric signal, connected to ends of the at least one electrically conductive textile filament,
• wherein deformability of the at least one electrically conductive textile filament is substantially equal to or greater than deformability of the portion of the flexible two-dimensional structure to which the at least one electrically conductive textile filament is constrained.