An Experimental Study on Three-Point Bending of Aluminum Alloy Foam-Filled Cylindrical Aluminum alloy Pipe
泡沫铝合金填充圆管三点弯曲实验研究

In this paper,three-point bending behavior of aluminum alloy foam-filled cylindrical aluminum alloy pipe with three different pipe thicknesses and two different spans was investigated experimentally.Three kinds of deformation modes,namely indentation,indentation-bending and tensile fracture of underneath pipe skin,were observed.Load-displacement curves of hollow and foam-filled pipes were obtained and compared with each other.It is found that the load-bearing capacity increases with the increase of the foam density but the failure strain decreases.The relative increase of the load-bearing capacity increases with the decrease of the pipe-wall thickness and the increase of the span.The mechanism of foam filler in enhancing the load-bearing capacity was also analyzed.It is found that foam filler will significantly reduce the indentation and the consequent degradation of the flexural rigidity of the cross-section,thus increase the load-bearing capacity.