چكيده به لاتين
Today, adhesives are used in various industries such as automotive, aerospace, etc. Along with all the advantages of adhesive joints over other joints, these types of adhesive joints also have disadvantages. Because adhesives are made of polymeric materials, they are weak against environmental conditions such as temperature and humidity. [48,50] One of the common environmental cycles that causes a significant decrease and degradation of properties in adhesive joints is their exposure to freezing and thawing cycles, especially in cold regions. [51,52] In other words, at certain times of the day, joints are exposed to negative temperatures, resulting in freezing, and at other times, they are exposed to positive temperatures, resulting in melting of the ice. In this study, the effect of freezing and thawing cycles on the mechanical properties of a two-component industrial adhesive is investigated. In this regard, the fabricated DCB samples were alternately immersed in 25°C water for 12 hours and then at -25°C for 12 hours. Then, the DCB samples were subjected to pure mode one failure loading. The results of the load-displacement curves show that the freeze-thaw cycles had a significant effect on the load-bearing capacity of the adhesive joints compared to the control samples (without applying freeze-thaw cycles), so that with increasing the number of freeze-thaw cycles from 30 to 120, a greater decrease in the load-bearing capacity of the adhesive joints occurs. To further study the failure behavior, the adhesive failure energy parameter was extracted experimentally. Also, tests were performed on butt joint samples that were subjected to pure tensile loading in both dry environments and freeze-thaw cycles.
