Flexural response of 3D printed sandwich composite

Bharath, H. S.; Bonthu, Dileep; Gururaja, Suhasini; Prabhakar, Pavana; Doddamani, Mrityunjay

doi:10.1016/j.compstruct.2021.113732

Cited by 47 publications

(17 citation statements)

References 83 publications

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“…Furthermore, this versatile bioinspired architecture, as presented in Figure b, can be associated with metals as well, including metal coating or direct metal printing, which holds great potential to be applied in advanced applications for higher requirements, such as the load-bearing components in submarine construction or aerospace fields. Moreover, it is also worth noting that some pioneer works that incorporate 3D printing and syntactic foam fabrication have been reported. − As a result, the combination between the mature syntactic foams and the bionic design proposed in this paper can be viable and is anticipated to achieve a synergistic effect that simultaneously attains extensive usage and improved mechanical properties, further promoting the application of mechanical metamaterials in reality.…”

Section: Resultsmentioning

confidence: 87%

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

Chen

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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Biological materials such as conch shells with crossed-lamellar textures hold impressive mechanical properties due to their capability to realize effective crack control and energy dissipation through the structural synergy of interfacial modulus mismatch and lamellar orientation disparity. Integrating this mechanism with mechanical metamaterial design can not only avoid the catastrophic post-yield stress drop found in traditional architectural materials with uniform lattice structures but also effectively maintain the stress level and improve the energy absorption ability. Herein, a novel bioinspired design strategy that combines regional particularity and overall cyclicity is proposed to innovate the connotation of long-range periodicity inside the metamaterial, in which the node constraint gradient and crossed-lamellar struts corresponding to the core features of conch shells are able to guide the deformation sequence with a self-strengthening response during compression. Detailed in situ experiments and finite element analysis confirm that the rotated broad layer stacking can shorten and impede the shear bands, further transforming the deformation of bioinspired metamaterial into a progressive, hierarchical way, highlighted by the cross-layer hysteresis. Even based on a brittle polymeric resin, excellent specific energy absorption capacity [4544 kJ/kg] has been achieved in this architecture, which far exceeds the reported metal-based syntactic foams for two orders of magnitude. These results offer new opportunities for the bioinspired metamaterials to substitute the widespread syntactic foams in specific applications required for both lightweight and energy absorption.

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Section: Resultsmentioning

confidence: 87%

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

Chen

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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“…A 3D printer based on commercial fused filament fabrication (FFF) is used to print defect-free syntactic foam core sandwich composites, and no debonding was observed in the bending experiment. 35 The mechanical properties of the out-of-plane, in-plane hexagonal honeycomb cores and s-shape corrugated cores made by 3D printing are tested and analyzed. 36 The research shows that 3D printing technology is not only promising for integrated manufacturing face sheets and cores, but also promising for manufacturing complex cores.…”

Section: Introductionmentioning

confidence: 99%

The compressive performances of 3D-printed micron-size corrugated sandwich structures

Gong

et al. 2023

Jnl of Sandwich Structures & Materials

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Micron-scale grid-shaped, V-shaped and U-shaped corrugated sandwich structures are fabricated by 3D printing technology and present different mechanical properties from those made by traditional method. Their peak stresses and elastic moduli could be fitted to cubic functions. The compression performance of the multilayer grid-shaped sandwich can be determined by the relative mechanical strength of layers. Adding a layer on a grid-shaped sandwich has no significant influence on the peak stress, but can enhance the elastic modulus by about 60.9 MPa. The deformation modes of multilayer V-shaped and U-shaped sandwiches can be determined by the load carrying path and the relative mechanical properties between interlayers and cores. The elastic modulus of V-shaped sandwich is enhanced with the increase of layer number, while the elastic modulus of U-shaped sandwich decreases with the increase of layer number. The peak stress and the elastic modulus of a four-layer V-shaped sandwich can reach 9.85 MPa and 261.09 MPa, and those of a four-layer U-shaped sandwich can reach 4.79 MPa and 119.18 MPa. The result reveals the principles that the reduced structural size and suppressed debonding, the structures and the load carrying path, and materials, influence the failure mode and mechanical properties of the corrugated sandwiches.

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“…It was found that the studied structures can offer new opportunities for use in lightweight systems and multifunctional applications through the studied concept of shape recovery. Three-dimensional printed sandwich composites were investigated [ 44 ] in order to determine the performance of bending in three points, after which the structural failure modes were analyzed. The result indicates that the addition of a glass micro balloon increases both the specific modulus and the strength of sandwich composites.…”

Section: Introductionmentioning

confidence: 99%

Compression and Bending Properties of Short Carbon Fiber Reinforced Polymers Sandwich Structures Produced via Fused Filament Fabrication Process

et al. 2022

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Additive manufacturing, through the process of thermoplastic extrusion of filament, allows the manufacture of complex composite sandwich structures in a short time with low costs. This paper presents the design and fabrication by Fused Filament Fabrication (FFF) of composite sandwich structures with short fibers, having three core types C, Z, and H, followed by mechanical performance testing of the structures for compression and bending in three points. Flatwise compression tests and three-point bending have clearly indicated the superior performance of H-core sandwich structures due to dense core structures. The main modes of failure of composite sandwich structures were analyzed microscopically, highlighting core shear buckling in compression tests and face indentation in three-point bending tests. The strength–mass ratio allowed the identification of the structures with the best performances considering the desire to reduce the mass, so: the H-core sandwich structures showed the best results in compression tests and the C-core sandwich structures in three-point bending tests. The feasibility of the FFF process and the three-point bending test of composite wing sections, which will be used on an unmanned aircraft, have also been demonstrated. The finite element analysis showed the distribution of equivalent stresses and reaction forces for the composite wing sections tested for bending, proving to validate the experimental results.

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Flexural response of 3D printed sandwich composite

Cited by 47 publications

References 83 publications

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

The compressive performances of 3D-printed micron-size corrugated sandwich structures

Compression and Bending Properties of Short Carbon Fiber Reinforced Polymers Sandwich Structures Produced via Fused Filament Fabrication Process

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