An experimental study on the influence of temperature and strain rate on the mechanical properties and delamination of GLARE 2/1 under bending load

Fiber metal laminates have garnered attention from the aviation and automotive industries due to their favorable mechanical properties. These laminates consist of thin metal layers and a fiber-reinforced epoxy layer. This study focuses on investigating and analyzing the impact of temperature and strain rate on GLARE 2/1 under bending conditions. GLARE 2/1 are composed of one layer of epoxy reinforced with glass fibers sandwiched between two layers of aluminum 2024. The samples were subjected to bending with loading rates of 0.03 and 0.3 1/s at temperatures of 25, 60, and 100 degrees Celsius.The force-displacement curves were extracted for three-point bending at different temperatures and strain rates. The deformation of the layers was observed using digital image correlation technology. The results indicate that, in GLARE 2/1 and at a constant loading speed, with increasing temperature, the maximum bending force decreases, this value decreased by 51% at a loading rate of 0.031/s and at 100 degrees Celsius compared to 25 degrees Celsius and this value decreased 30% at a loading rate of 0.3 1/s. Increasing the loading speed in GLARE 2/1 samples leads to a greater increase in the maximum bending force. The bending elastic coefficient at a loading rate of 0.3 1/s is higher than at a loading rate of 0.03 1/s at all temperatures. By utilizing the deformations obtained under different temperature and loading conditions, it is possible to control the deformation of GLARE 2/1 in forming processes.