Transactions of Nanjing University of Aeronautics & Astronautics
Experimental Analysis on Local Buckling of GFRP-Foam Sandwich Pipe Under Axial Compressive Loading
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Abstract:
To find out the local buckling behaviors of glass fiber reinforced plastic(GFRP)-foam sandwich pipe suffering axial loading, a series of quasi-static axial compression tests are carried out in the laboratory. Comparing with the test data, systematic numerical analysis on the local buckling behavior of this sandwich pipe is also conducted, and the buckling failure mechanism is revealed. The influences of the key parameters on bearing capacity of the sandwich structure are discussed. Test and numerical results show that the local buckling failure of the GFRP-foam sandwich pipe is dominated basically by two typical modes, i.e., the conjoint buckling and the layered buckling. Local buckling at the end, shear failure at the end and interface peeling failure are less efficient than the local buckling failure at the middle height, and ought to be restrained by appropriate structural measures. The local buckling bearing capacity increases linearly with the core density of the sandwich pipe structure. When the core density is relatively high (higher than 0.05 g/cm3), the effect of increasing the core density on improving the bearing efficiency is less on the specimens with a large ratio of the wall thickness to the radius than on those with a small one. Local layered buckling is another failure mode with lower bearing efficiency than the local conjoint buckling, and it can be restrained by increasing the core density to ensure the cooperation of the inner and the outer GFRP surface layer. The bearing capacity of the GFRP-foam sandwich pipe increases with the height-diameter ratio; however, the bearing efficiency decreases with this parameter.
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TU33
CHINA AERO-SCIENCES
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