Experimental research on elasto-plastic circular pipe under bending loads

A quasi-static four-point bending test were carried out on circular aluminum pipes with 4 different diameter-to-thickness ratios ranging from 20 to 42, and with 3 different materials (LY11M, LY12M, LF2M). We obtained the relationship between bending moment and curvature in the purely bent pipes, and recorded the ovalization of the shell cross-section caused by bending. For pipes whose diameter-to-thickness ratio is 42, short wavelength ripples developed on the compressed side of shell were observed and recorded. Also, the influences of diameter-to-thickness ratio and material on the mode of collapse and moment-curve relationship were discusses.