Attempts to improve energy absorption characteristics of circular metal tubes subjected to axial loading

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High energy absorption efficiency of thin-walled conical corrugation tubes mimicking coconut tree configuration (2018, methodology): “Another way to control the energy absorption and stabilize the collapse mode is using circumferential grooves from the outer and inner surface of the tube [27-30].”
On the crashworthiness performance of thin-walled energy absorbers: Recent advances and future developments (2017, methodology): “These components exhibited several improvements in the crush energy absorbing behaviour such as high energy absorption capacity, better crushing stability and less sensitive to loading characteristics such as direction and uniformity [106].”