Evaluation of Adhesive Systems for Bonding 5109S Neoprene-to-Steel and Aluminum Substrates

摘要

The primary objective of the project was to characterize the commercial adhesive system Chemlok 205/220 based on response and fracture/debonding properties, and to apply this information to an understanding of why it functions as well as it does. Three phases or major tasks were defined. In Phase I, ten adhesive systems were screened for suitability for use in the TR-317R HMA application. A large test matrix of 240 model head mass assemblies (MHMAs) was employed to charter the effort of four environments and two levels of flaws on the debonding/fracture relaxation to be demonstrated and elastic behavior to be evaluated with a replication of three specimens for each combination. The results for the MHMA's investigation showed wide variations in times-to-failure for similar specimens, which is consistent with fleet experience on the TR-155F. There is a strong implication that application of a polysulfide bead (PRC-611) to the bondline results in a more durable bond.