Low-energy impact response of composite sandwich panels with thermoplastic honeycomb and reentrant cores

Özen, İsmail; Çava, Kutay; Gedikli, Hasan; Alver, Ümit; Aslan, Mustafa

doi:10.1016/j.tws.2020.106989

Cited by 61 publications

(30 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The second category of sandwich structures, on the other hand, is characterized by an internal core and skins, both made of plastic materials, which are usually lighter when compared to metallic materials. However, their energy absorption capability, related to elastic and fracture mechanisms, is far less than that provided by metallic absorbers [8,9].…”

Section: Introductionmentioning

confidence: 99%

On the Effects of Core Microstructure on Energy Absorbing Capabilities of Sandwich Panels Intended for Additive Manufacturing

2022

View full text Add to dashboard Cite

Increasing transportation safety can be observed as one of the biggest engineering challenges. This challenge often needs to be combined with the need to deliver engineering solutions that are able to lower the environmental impact of transportation, by reducing fuel consumption. Consequentially, these topics have attracted considerable research efforts. The present work aims to address the previously cited challenges by maximizing the energy absorption capabilities of hybrid aluminum/composite shock absorbers with minimal thickness and mass. This engineering solution makes it possible to lighten vehicles and reduce fuel consumption, without compromising safety, in terms of crashworthiness capabilities. A numerical sensitivity study is presented, where the absorbed energy/mass (AE/m) and the absorbed energy/total panel thickness (AE/Htot) ratios, as a consequence of low-velocity impact simulations performed on six different shock absorbers, are compared. These hybrid shock absorbers have been numerically designed by modifying the core thickness of two basic absorbers’ configurations, characterized, respectively, by a metallic lattice core, intended to be produced through additive manufacturing, and a standard metallic honeycomb core. This work provides interesting information for the development of shock absorbers, which should be further developed with an experimental approach. Indeed, it demonstrates that, by integrating composite skins with a very light core producible, by means of additive manufacturing capabilities, it is possible to design shock absorbers with excellent performance, even for very thin configurations with 6 mm thickness, and to provide a significant increase in AE/m ratios when compared to the respective equal volume standard honeycomb core configurations. This difference between the AE/m ratios of configurations with different core designs increases with the growth in volume. In detail, for configurations with a total thickness of 6 mm, the AE/m increases in additive manufacturing configurations by approximately 93%; for those with a total thickness of 10 mm, the increase is 175%, and, finally, for those with a total thickness of 14 mm, the increase is 220%.

show abstract

Section: Introductionmentioning

confidence: 99%

On the Effects of Core Microstructure on Energy Absorbing Capabilities of Sandwich Panels Intended for Additive Manufacturing

2022

View full text Add to dashboard Cite

show abstract

“…They also studied the energy absorption capability of 3D-printed PLA lightweight sandwich panels with architected cellular cores under low-velocity impact. Özen et al [19] also investigated the low-energy impact response of woven CFRP sandwich composite panels with 3D-printed thermoplastic ABS honeycomb and re-entrant cores, particularly their impact strength and energy dissipation behavior. Chen et al [20] performed a similar analysis on additive manufactured 3D re-entrant honeycombs under impact and quasi-static compression loading, in order to determine their energy absorption capability and failure modes.…”

Section: Introductionmentioning

confidence: 99%

A 3D-Printed Honeycomb Cell Geometry Design with Enhanced Energy Absorption under Axial and Lateral Quasi-Static Compression Loads

et al. 2022

View full text Add to dashboard Cite

This work presents an innovative honeycomb cell geometry design with enhanced in-plane energy absorption under quasi-static lateral loads. Numerical and experimental compression tests results under axial and lateral loads are analyzed. The proposed cell geometry was designed to overcome the limitations posed by standard hexagonal honeycombs, which show relatively low stiffness and energy absorption under loads that have a significant lateral component. To achieve this, the new cell geometry was designed with internal diagonal walls to support the external walls, increasing its stiffness and impact energy absorption in comparison with the hexagonal cell. 3D-printed unit-cell specimens made from ABS thermoplastic material were subjected to experimental quasi-static compression tests, in both lateral and axial directions. Energy absorption was compared to that of the standard hexagonal cell, with the same mass and height. Finite element models were developed and validated using experimental data. Results show that the innovative geometry absorbs approximately 15% more energy under lateral compression, while maintaining the same level of energy absorption of the standard hexagonal cell in the axial direction. The present study demonstrates that the proposed cell geometry has the potential to substitute the standard hexagonal honeycomb in applications where significant lateral loads are present.

show abstract

“…From the design point of view, there are various architectures with different cell topology such as auxetic and honeycomb, which already are being used in the literature [ 1 , 15 , 28 , 29 , 30 , 31 , 32 , 33 ]. Among them, honeycomb cells are the most common topology used to study the quasi-static and dynamic behavior of such structures [ 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, honeycomb cells are the most common topology used to study the quasi-static and dynamic behavior of such structures [ 34 , 35 , 36 ]. Corrugated and (meta-) sandwich structures are one of the common applications of lattice structures for the application of impact, bending resistance and energy absorbing systems [ 31 , 37 , 38 , 39 , 40 ]. The improvement of energy absorption of 2D lattice structures was experimentally and numerically investigated by gradual changes in the size of the unit cells [ 18 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption and Mechanical Performance of Functionally Graded Soft–Hard Lattice Structures

et al. 2021

View full text Add to dashboard Cite

Today, the rational combination of materials and design has enabled the development of bio-inspired lattice structures with unprecedented properties to mimic biological features. The present study aims to investigate the mechanical performance and energy absorption capacity of such sophisticated hybrid soft–hard structures with gradient lattices. The structures are designed based on the diversity of materials and graded size of the unit cells. By changing the unit cell size and arrangement, five different graded lattice structures with various relative densities made of soft and hard materials are numerically investigated. The simulations are implemented using ANSYS finite element modeling (FEM) (2020 R1, 2020, ANSYS Inc., Canonsburg, PA, USA) considering elastic-plastic and the hardening behavior of the materials and geometrical non-linearity. The numerical results are validated against experimental data on three-dimensional (3D)-printed lattices revealing the high accuracy of the FEM. Then, by combination of the dissimilar soft and hard polymeric materials in a homogenous hexagonal lattice structure, two dual-material mechanical lattice statures are designed, and their mechanical performance and energy absorption are studied. The results reveal that not only gradual changes in the unit cell size provide more energy absorption and improve mechanical performance, but also the rational combination of soft and hard materials make the lattice structure with the maximum energy absorption and stiffness, in comparison to those structures with a single material, interesting for multi-functional applications.

show abstract

Low-energy impact response of composite sandwich panels with thermoplastic honeycomb and reentrant cores

Cited by 61 publications

References 37 publications

On the Effects of Core Microstructure on Energy Absorbing Capabilities of Sandwich Panels Intended for Additive Manufacturing

On the Effects of Core Microstructure on Energy Absorbing Capabilities of Sandwich Panels Intended for Additive Manufacturing

A 3D-Printed Honeycomb Cell Geometry Design with Enhanced Energy Absorption under Axial and Lateral Quasi-Static Compression Loads

Energy Absorption and Mechanical Performance of Functionally Graded Soft–Hard Lattice Structures

Contact Info

Product

Resources

About