Creating tougher interfaces via suture morphology in 3D-printed multi-material polymer composites by fused filament fabrication

Altuntas, Umut; Çöker, Demirkan; Yavas, Denizhan

doi:10.1016/j.addma.2022.103359

Cited by 5 publications

(1 citation statement)

References 47 publications

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“…[38,39] Nonstochastic cellular solids are interconnected tessellations of optimized complex geometries unit cells capable of sustaining considerable deformations at low weight penalty. [40,41] Lattice structures have been printed with a broad range of engineering materials using various additive manufacturing techniques, including fused filament fabrication, [42,43] material jetting, [40,44] vat photopolymerization, [22] and selective laser sintering. [45][46][47] These additively manufactured ordered lattice structures strategically (i.e., through intentional design and formal optimization) fill several gaps in property maps, [48][49][50] including stiffness, [51,52] strength, [53] specific energy absorption (SEA), [54] and toughness.…”

Section: Introductionmentioning

confidence: 99%

Structural Performance of Additively Manufactured Composite Lattice Structures: Strain Rate, Cell Geometry, and Weight Ratio Effects

Singh,

Ngo,

Huynh

et al. 2023

Adv Eng Mater

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The proliferation of ordered cellular structures in industrial and technological applications is justified by their superior mechanical performance, including tunable energy absorption strategies and potential multifunctionality. This research evaluates the mechanical response of composite lattice structures fabricated using vat photopolymerization additive manufacturing process and printable particulate composite materials. Several generations of modified printable resins are prepared by hybridizing flexible resin with varying glass microballoons reinforcement weight percentages. Multifaceted characterization regiments highlight the process–property–performance interrelationship by submitting printed composite structures to quasi‐static and impact‐loading scenarios combined with digital stills and high‐speed photography, respectively. Image analyses of optical and scanning electron micrographs quantify the dimensional accuracy of the composite lattice structures with cylindrical and hexagonal cellular geometries. The mechanical characterization uncovers the effect of cell geometry and reinforcement on the global structural behavior, eliciting differences in load‐bearing capacity, local strain developments, and structural densification. Exploratory digital image correlation supports the global structural deformations, revealing their relationship with the developed local strain state within the unit cells. The outcomes of this research elucidate the effect of strain rate, unit cell geometry, and reinforcing ratios on the structural performance of composite lattice structures at the macro‐ and microstructure levels.

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Section: Introductionmentioning

confidence: 99%

Structural Performance of Additively Manufactured Composite Lattice Structures: Strain Rate, Cell Geometry, and Weight Ratio Effects

Singh,

Ngo,

Huynh

et al. 2023

Adv Eng Mater

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The Toughness of Interlocking Metasurfaces

Young,

Smith,

Grutzik

et al. 2024

Adv Eng Mater

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Interlocking metasurfaces (ILMs) are arrays of autogenous latching unit cells patterned across a surface. These create structural joints similar to bio‐inspired suture joints but patterned over a 2D surface rather than a 1D seam. This enables ILMs to be an alternative to conventional joining technologies such as bolts, welds, and adhesives. However, compared to conventional joining methods, relatively little is known of the engineering considerations for designing structural ILMs. In this study, the interfacial toughness of an archetypal ILM was examined for the first time. Under the conditions studied here, the ILM was substantially tougher than the material from which it was made; in this case exhibiting up to a 50% increase in interfacial crack initiation energy over the solid base material, a photocured 3D printed polymer. Through experimental tests using in‐situ digital image correlation along with complementary computational analyses, the mechanism of toughening in the ILM structure and the origins of toughness anisotropy were revealed. The increase in toughness is associated with cross‐cell interactions, i.e. load‐sharing across unit cells, which gives rise to a finite process zone length with different effective material properties. In this way, ILM toughening is analogous to crack blunting in ductile materials or fiber bridging in composites; yet here, the ILM was composed of a single‐phase base material and so the architected toughening is geometric in nature and hence amenable to future topological optimization.This article is protected by copyright. All rights reserved.

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The role of interface in joining of 316 L stainless steel and polylactic acid by additive manufacturing

2023

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Creating tougher interfaces via suture morphology in 3D-printed multi-material polymer composites by fused filament fabrication

Cited by 5 publications

References 47 publications

Structural Performance of Additively Manufactured Composite Lattice Structures: Strain Rate, Cell Geometry, and Weight Ratio Effects

Structural Performance of Additively Manufactured Composite Lattice Structures: Strain Rate, Cell Geometry, and Weight Ratio Effects

The Toughness of Interlocking Metasurfaces

The role of interface in joining of 316 L stainless steel and polylactic acid by additive manufacturing

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