From the paper by Minoru Yamashita, Tomohito Okuyama, Naoya Nishimura and Toshio Hattori, Department of Mechanical and Systems Engineering, Gifu University,
"Control of onset of buckling lobe in axial impact of square tube", Materials Science Form, Vol. 566 (2008), pp. 173-178
Numerical analysis was performed using the nonlinear dynamic explicit finite element code, DYNA3D.
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