Enhanced energy mitigation of thin-walled tube filled with liquid nanofoam under dynamic impact

摘要: Abstract Due to the intimate contact between fluid-like liquid nanofoam (LN) filler and tube wall, filler-tube wall interaction in LN-filled (LNFT) is enhanced, leading a much-improved performance of composite structure. However, comprehensive understanding energy mitigation underlying working mechanism LNFT still lacking. This study aims explore crushing behavior subjected quasi-static compression dynamic impact reveal at different strain rates selection criteria for LN material. A series tests are conducted on LNFTs with various fillers. The strengthening coefficient larger than 3.5. Micro-CT images show that LN-tube improves through extended plastic deformation wall. Under impacts, absorption capacity shows 54% increase compared under tests, remarkable 8.0. rate effect due mechanisms LN-filler, i.e. dissipation lower capture higher rate. To optimize LNFT, most critical system parameters infiltration pressure total pore volume LN-filler stiffness ductility These findings research outcomes expedite provide design guidance LN-based structures.