The objectives of the ANR GauguIn are a better understanding of the phenomena of Liquid Metal Embrittlement (LME)), in particular through in-situ tests and observations (AFM, TEM, SEM) down to nanoscopic scales and a new numerical analysis approach of the LME aiming to develop a simulation of brittle fracture in the presence of liquid metal. The model system studied is an alpha-phase brass with variable Zn content (0 to 30%) in contact with the liquid Ga-In (eGaIn) eutectic. Macroscopic mechanical tests are performed to study the LME sensitivity taking into account the results for different geometries, for several metallurgical states and at different strain rates in order to completely characterize the mechanical behavior of this system. In-situ observations at SEM, SEM-FIB and TEM should make it possible to validate the phenomena taking place at the tip of a crack wetted by the Ga-In eutectic. Finally, the physico-chemistry of the interface is characterized (wettability by eGaIn and interface reactions). In parallel, a simulation of cracking assisted by a liquid metal will be developed including the competing processes at the tip of the crack (the emission of dislocations and brittle fracture in the presence of liquid metal). The effect of the adsorption of a liquid metal will be studied by simulation in molecular dynamics to establish energy balances of competing processes. The results of the theoretical approach will be confronted with the experimental data in order to be able to develop a predictive tool of LME sensitivity which could also be adapted to industrial systems.