Ali Kordi, Saeed Adib Nazari, Ali Emam, Mohammad Najafi, Maryam Ghasabzadeh Saryazdi
February 23, 2021
In this research, the effect of adding graphene-based aerogel ((G)A) nanoparticles on the tensile and fatigue behavior of the epoxy polymer was investigated. Specimens of nanocomposites were prepared by adding 0.05, 0.1, 0.2, 0.5, 1, and 2 wt.-% (G)A nanoparticles to the epoxy polymer. Tensile tests revealed that the 0.1 wt.-% graphene-based aerogel/epoxy ((G)A/E) nanocomposites had the highest increase in tensile strength with 19 % growth compared to neat epoxy. Also, the tensile modulus increased by 15 % in the 0.5 wt.-% (G)A/E nanocomposites. A substantial improvement in fatigue life of the epoxy polymer was observed on adding 0.1 wt.-% (G)A nanoparticles. For instance, the fatigue life of (G)A/E nanocomposites improved by 236 % at a maximum stress of 35 MPa compared to the neat epoxy. Fractography in failure analysis of the test samples showed that the placement of (G)A porous nanoparticles on the epoxy polymer with crack twist or crack tilt prevent the formation of large and catastrophic cracks, resulting in delaying the fatigue failure.