Mechanical behavior of 3D‐printed polymeric metamaterials for lightweight applications

Abstract

Artificially structured materials, also called metamaterials, can achieve very unique properties due to the fact that their attributes are mainly derived from the design of the structures. This work gives an overview of the mechanical behavior of four differently designed and 3D-printed metamaterial structures.For each structure, both, the printing technique and the materials used for printing were varied. In total four different polymers were investigated and processed with three different 3D-printing techniques. Their mechanical behavior was studied by compression tests, which showed the wide range of material properties that can be achieved by utilizing the different materials/3D-printing techniques. In addition, bending tests of 3D-printed bending specimens were conducted to provide material data for subsequent finite element simulation of the structures. The comparison of experiments and numerical simulations gave further insight into local deformation mechanisms and allowed for a better understanding of the overall deformation behavior.

Determination of Cyclic Load Limits for Plasma‐Sprayed Copper Tracks on Material Extrusion‐Based Printed Surfaces

“…The last hypothesis elucidates the crack initiation due to extremely high stresses in the copper, causing subsequently the failure of the whole part. Hereafter, the stress situation in the sample will be calculated stepwise based on the Equation ( 4)- (7). As apparent from Figure 7, superficial crack formations are more pronounced for 0°samples than for 90°s amples.…”

“…Wellknown benefits of additive manufacturing are the fast adaptability and production of parts, customized parts, greater freedom in geometry, material and weight reduction, and many more. [1][2][3][4][5][6][7] As a result of the increasing interest in this process, the development of each technology has made huge progress in the last 10 years. [1,2,[8][9][10][11] Along with the development of the printing process, more materials have been employed for layer-by-layer production.…”

3D Printed Graphene‐Based Metamaterials: Guesting Multi‐Functionality in One Gain

“…Stretching/bending‐dominated lattices can be divided into beam‐based topologies and plate‐based topologies, of which the classical beam‐based topologies are the most widely used. [ 1,44–47 ] They consist of rods with identical dimensions connected through shared nodes. If the beams are slender (low $$\frac{\rho }{{{\rho _{\rm{s}}}}}$$), they can be ideally defined as stretching‐dominated structures ( E , σ $$ \propto {(\frac{\rho }{{{\rho _{\rm{s}}}}})^1}$$) or bending‐dominated structures ($$E \propto {(\frac{\rho }{{{\rho _{\rm{s}}}}})^2}$$ and $$\sigma \propto {(\frac{\rho }{{{\rho _{\rm{s}}}}})^{1.5}}$$).…”

“…It is obvious that stretching-dominated structures exhibit higher mechanical performance than bending-dominated structures at ultralow Stretching/bending-dominated lattices can be divided into beam-based topologies and plate-based topologies, of which the classical beam-based topologies are the most widely used. [1,[44][45][46][47] They consist of rods with identical dimensions connected through shared nodes. If the beams are slender (low…”

Study of the interlayer bonding strength for combined 3D printing and milling of polyetheretherketone

“…Selective improvement of Z-direction interlayer bonding strength can effectively reduce milling delamination of 3D-printed PEEK parts and is a prerequisite for using CPMP technology to create PEEK parts. The method may also be applicable to CPMP technology for other thermoplastic materials [39][40][41] and it is necessary to continue the associated studies.…”