Issue Section:
Discussions
Topics:
Buckling
In Ref. [1], the authors study the evolution of buckling in a dynamically impacted column. They formulate the mathematical problem by means of the partial differential equations
ρAu··-(EAu')'=0
(1)
ρAw··+(EIw")''- (EAu'w')'=(EIw" 0)''
(2)
within the corresponding boundary conditions, where w0(x) is a predeformation. This mathematical formulation is not completely consistent and we believe it could easily be improved as described below. Equations (1) and (2) lead to
ρAu··-(EAu')' = 0
(3)
ρAw··+(EIw")'' - (EAu'w')'=0
(4)

if we neglect the predeformation w0...

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