Buckling and Post-Buckling Behavior of Uniform and Variable-Density Lattice Columns Fabricated Using Additive Manufacturing

Abstract

Lattice structures are known for their high strength-to-weight ratio, multiple functionalities, lightweight, stiffness, and energy absorption capabilities and potential applications in aerospace, automobile, and biomedical industry. To reveal the buckling (global and local) and post-buckling behavior of different lattice morphologies, both experimental and simulation-based studies were carried out. Additionally, a variable-density lattice structure was designed and analyzed to achieve the optimal value of critical buckling load. Latticed columns were fabricated using polyamide 12 material on multi jet fusion 3D printer. The results exhibited that the buckling in lattice columns depends on the distribution of mass, second moment of inertia I, diameter and position of vertical beams, number of horizontal or inclined beams, and location and angle of the beams that support the vertical beams. The number of horizontal and inclined beams and their thickness has an inverse relation with buckling; however, this trend changes after approaching a critical point. It is revealed that vertical beams are more crucial for buckling case, when compared with horizontal or inclined beams; however, material distribution in inclined or horizontal orientation is also critical because they provide support to vertical beams to behave as a single body to bear the buckling load. The results also revealed that the critical buckling load could be increased by designing variable density cellular columns in which the beams at the outer edges of the column are thicker compared with inner beams. However, post-buckling behavior of variable density structures is brittle and local when compared with uniform density lattice structures.

A Review of 3D Printing in Construction and its Impact on the Labor Market

“…In the manufacturing industry, high-speed 3D printing technologies are explored in recent time such as high-aspect-ratio nozzles for micro-extrusion [89]; integration of powder bed technology, multi-jet function technology, and high-speed sintering technology [90], to name a few. Moreover, as described in [91], special structural element such as lattice column and beam, or cellular structure which are suitable to construct using 3D printing, can be explored for the construction projects.…”

Investigation of Compression and Buckling Properties of a Novel Surface-Based Lattice Structure Manufactured Using Multi Jet Fusion Technology

“…A wide range of studies were conducted to buckle beams, planes, and shells [ 32 , 33 , 34 ]. However, to investigate critical buckling of lattice structures, Nazir et al [ 35 ] studied the variable-density lattice structure columns for critical and post-buckling behavior. They revealed that critical buckling depends on several parameters, such as the thickness of the beam, orientation, second moment of inertia, and mass distribution in the structures.…”

“…However, countable researchers have investigated surface-based lattice structures. Similarly, the lattice structure column was studied with limited numbers, whereas holes/pores and elliptical shape-based columns were studied extensively [ 33 , 34 , 35 ]. Considering these research gaps, a novel lattice design named O-Surface (OS) was introduced and compared with the existing Sea Urchin structure (SU) to investigate and reveal its inherent mechanical properties.…”

Orientation Planning in the Fused Deposition Modeling 3D Printing of Anatomical Spine Models

“…Fused deposition modeling (FDM) is a 3D printing process that uses a continuously extruded filament through a heated printer core. This is universally accomplished with thermoplastic materials that have varying mechanical and physical properties that can be tailored to the function of the desired print [2]. FDM 3D printing has been investigated for creating lumbar vertebral models for education and procedural simulation [3,4].…”