摘要：Flexible risers are crucial pieces of equipment for moving output fluids from wells to platforms during the extraction of oil and gas from deepsea *** of the causes of collapse in these pipes is the high hydrostatic pressure applied to risers in deep *** innermost layer of a riser,known as the carcass layer,plays a critical role in resistance to external *** this study,we investigated the collapse(nonlinear buckling)of a riser under external pressure,and a novel design based on the structure of a beetle’s exoskeleton was used to increase the load capacity of the carcass *** type of beetle skeleton is constructed in such a way that it creates strong connections among the various parts of the external skeleton to considerably enhance strength against external pressure while allowing necessary *** assess the performance of the design in comparison with the original design,we examined the nonlinear buckling of the new structure under external *** genetic algorithm optimization,design parameters were obtained,and the maximum strength before collapse was *** show that the critical pressure in the new design substantially increases relative to that in the original design.