PROCÉDÉ SANS CONTACT POUR LA MESURE DE PROFIL DE CONTRAINTE EN UN ENDROIT INTERPOSÉ AU SEIN D'UN OBJET SOUPLE DÉFORMABLE PRÉSENTANT UNE ÉVOLUTION DYNAMIQUE DE LA CONTRAINTE SOUS UNE CHARGE DYNAMIQUE OU UNE CASSURE DE L'OBJET
A non-invasive method for estimation of strain profile and dynamic evolution of the strain at a location interposed inside a block of soft material, includes forming a tracer grid consisting of microscopic lines or regularly spaced microscopic dots on a single plane buried inside the soft block； preparation of a deformable object embedded with the tracer grid in three primary steps: i. preparing a block of crosslinked material by crosslinking a first predetermined quantity of a pre-polymer solution containing a monomer, a crosslinking agent, and an initiator and promoter all mixed in a solvent at a known stoichiometric weight ratio； ii. transferring a grid comprising of lines or dots onto the face by direct writing or transferring from an easy release surface； and iii. crosslinking a second predetermined quantity of the same pre-polymer solution on the gel surface, such that this second crosslinked material gets welded to the first one.
