In the study, acoustic emission (AE) technique was applied to monitor polymer failures. Specimens produced of two aluminum flat bars bonded together with a thick layer of cured epoxy resin were subjected to Double Cantilever Beam (DCB) test. Epidian 5 epoxy resin cured with PAC curing agent as well as Epidian 53 epoxy resin cured with Z1 curing agent were used as adhesives. However, a special procedure of specimens preparation was needed which was elaborated by authors after preliminary research including aditional analysis of surface roughness parameters and surface free energy of aluminum flat bars. Acoustic emission system was then used to register AE signal parameters during fracture test: frequency of elastic waves emitted inside the material, number of hits (event), number of counts, energy and amplitude. Next, the obtained AE parameters were deeply analyzed and compared to the results of mechanical test and authors’ previously conducted examinations. Moreover, a special emphasis was put on applicability of Wawelet Transform (WT) as well as numerical simulation for fracture analysis was conducted.