Experimental and numerical simulation on axial compression of GFRP-long-tube under quasi-static and dynamic loads

In order to obtain the failure morphology and mechanical properties of GFRP long tubes under quasi-static axial compression and considering the effects of loading rates on the mechanical properties of GFRP long tubes, axial compression tests were carried out on three 1000 mm-long glass fiber reinforced composite (GFRP) tubes. Subsequently, numerical simulations of the axial compression of GFRP long tubes were performed using the finite element analysis software ANSYS/LS-DYNA based on the experimental data. By applying different strain rates, the effects on the mechanical properties of GFRP long tubes were observed, further exploring their mechanical behavior. The results show that GFRP is a strain-sensitive material, and its maximum bearing capacity increases with the increase of strain rate, while its displacement decreases accordingly. The failure of GFRP long tube is concentrated in the middle, and the bearing capacity shows a linear change in the early stage. After reaching the ultimate bearing capacity, the bearing capacity will show a trend of first decreasing, then increasing and finally decreasing.