Experimental and numerical investigation on pre-stressed lattice structures

Abstract

The effect of pre-stress on the buckling behaviour of geometric unit cells of collinear square lattices is investigated experimentally and numerically. The geometric unit cells are manufactured using fused deposition modelling. Manufacturing strategies are presented which incorporate fibres subjected to pre-stress within the unit cell. The effect of pre-stressed fibres is analysed by comparing the compressive behaviour of unit cells with and without fibre reinforcement. The buckling behaviour of the unit cells is also investigated numerically by employing a parametric study within Abaqus varying the pre-stress in the fibres. The experimental test series shows that the addition of pre-stressed fibres to the system results in an increase in buckling and maximum load of 260 % to 480 % and 220 % to 350 % respectively. The increase strongly relates to the manufacturing quality, i.e. the bonding between the lattice material and the fibres, where a sufficient bonding yields significantly larger loads. The experimental findings on the qualitative and quantitative buckling behaviour correspond well with results obtain from the numerical study.

Buckling and postbuckling of architectured materials: A review of methods for lattice structures and metal foams

“…107,108 For obtaining the desired effective properties of archimats, either the internal architecture 3 in terms of the orientation 102 and aspect ratios 106,109 of the individual structural members can be modified or a combination of different base materials can be utilized. 29,104,107 Additionally, manufacturing defects can have a strong impact on the mechanical behaviour of archimats 17,18,55 and consequently have to be considered in the design process.…”

“…The above methodology has recently been successfully employed to model fibre-stayed, collinear lattice structures 27 while experimental and numerical investigations confirmed the results. 28,29 Its potential for further investigations on archimats has been accredited in ref. 30 The framework is particularly advantageous when so-called modal nudges, which are small, deliberate geometric alterations to the structure that were previously determined via information derived by the postbuckled configuration of the baseline idealized structure, 31 are to be introduced.…”

The investigation of printing parameters effect on tensile characteristics for triply periodic minimal surface designs by Taguchi

“…4 AM has also brought about a significant transformation in advanced manufacturing through its ability to facilitate the fabrication of intricate and personalized lattice structures. 5 FFF is widely recognized as one of the most prevalent methods employed in additive manufacturing. 6,7 FFF is a mature technology that has replaced conventional methods such as plastic forming, injection molding, and CNC machining.…”

Probing the stability landscape of prestressed stayed columns susceptible to mode interaction

“…However, the availability of equivalent information from experimental tests is comparatively limited [3,[12][13][14]. Firstly, traditional quasi-static loading techniques based on displacement or force control at one or more points are unable to traverse limit points in the fundamental loading parameter, because the immediate equilibrium beyond limit points is statically unstable, causing the structure to snap to another equilibrium [15].…”