Buckling of a holey column

Area of Science:

• Solid Mechanics
• Materials Science
• Structural Engineering

Background:

• Elastic columns under axial load are prone to buckling, a critical failure mode.
• Conventional buckling (global, lateral) limits structural design and efficiency.
• Microstructural modifications can alter buckling behavior.

Purpose of the Study:

• To investigate the buckling behavior of an elastic column with a novel microstructure.
• To determine if introducing centered holes influences the buckling mode.
• To compare the performance of the novel buckling mode with conventional buckling.

Main Methods:

• Combined experimental and numerical simulations were employed.
• Axial load was applied to elastic columns with a regular line of centered holes.
• Buckling modes and critical loads were analyzed.

Main Results:

• A regular line of centered holes prevents conventional global, lateral buckling.
• A new internal buckling mode is observed, characterized by alternate compression of holes.
• This internal mode is preferred for intermediate column lengths and sufficiently large holes.
• Classical global buckling dominates for very short or very long columns.

Conclusions:

• Microstructuring with centered holes introduces a distinct internal buckling mechanism.
• The internal buckling mode offers potential for more compact structural designs.
• The choice between internal and global buckling depends on column geometry and hole size.