Onset of Progressive Buckling by Inertia Force in Axial Impact of Straight and S-Curved Square Tubes

Minoru Yamashita; Toshio Hattori

doi:10.4028/www.scientific.net/AMR.445.847

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 445Onset of Progressive Buckling by Inertia Force in...

Onset of Progressive Buckling by Inertia Force in Axial Impact of Straight and S-Curved Square Tubes

Abstract:

For the improvement of the deformation characteristic and the energy absorption efficiency of the tubular structure at impact event, a method generating the first buckling lobe using the inertia force was investigated. The solid block was attached to the wall so that its inertia force causes the partial plastic deformation that plays a role of the trigger of progressive buckling at the beginning of impact. Drop-weight impact experiment revealed that the onset of progressive buckling was achieved at the desired portion by the method. To increase the variety of tube shapes, numerical examination was conducted with the dynamic explicit finite element method. Long straight and S-curved tubes, which have square cross-section, were numerically modeled with shell elements. They were assumed to be impacted to the rigid wall to estimate the dynamic collapse behavior. The first buckling lobe generated by inertia force was demonstrated for the straight tube. The S-curved tube exhibited a bending collapse mode without the method. However, such mode was avoidable by applying the method. Then the energy absorption efficiency of the tube was drastically increased.