Modal characterization of additively manufactured TPMS structures: comparison between different modeling methods

Abstract

The use of lattice structures has received increasing interest in various engineering applications owing to their high strength to weight ratio. Advances in additive manufacturing technologies enabled the manufacturing of highly complex lattice structures such as triply periodic minimal surface (TPMS) models in recent years. The application of simulation tools is expected to enhance the performance of these designs further. Therefore, it is vital to understand their accuracy and computational efficiency. In this paper, modal characterization of additively manufactured TPMS structures is studied using five different modeling methods for a beam, which is composed of primitive, diamond, IWP, and gyroid unit cells. These methods include (1) shell modeling, (2) solid modeling, (3) homogenization, (4) super-element modeling, and (5) voxelization. The modal characterization is performed by using modal analysis, and the aforementioned models are compared in terms of their computational efficiency and accuracy. The results are experimentally validated by performing an experimental modal testing on a test specimen, made of HS188, and manufactured by direct metal laser melting. Finally, the relationship between the modal characteristics and volume fraction is derived by carrying out a parametric study for all types of TMPS structures considered in this paper. The complex modal characteristics of different TPMS types suggest that they can be jointly used to meet the ever-challenging design requirements using the modeling guidelines proposed in this study.

Mechanical Strength of Triply Periodic Minimal Surface Lattices Subjected to Three-Point Bending

“…Other failure modes, such as face wrinkling and core failure, can be prevented by increasing the relative density. These results agree with those of other studies [ 26 , 37 ] showing that increasing the thickness of the face sheets or using a tougher material can decrease the face normal stress and bond stress, which can prevent both failure modes.…”

“…Many studies have demonstrated that discretising the core surface as a shell rather than a solid mesh produces superior results. This is because the thickness aspect ratio is large, and the shell model can provide more accurate results [ 26 , 27 , 28 ]. To generate the shell model, the software Rhino was used to generate TPMS geometries, which were then exported to ANSYS for finite element analysis (FEA) of the structure.…”

“…Simsek et al [ 26 ] numerically analysed different mesh types for TPMSs to determine the suitable modelling mesh. Results revealed that the shell model is appropriate for meshes with thin and uniform wall thickness.…”

Machine learning for predicting mechanical behavior of concrete beams with 3D printed TPMS

“…This theory was verified by numerous studies with both simulations and experiments. In fact, with at least 4 layers, the Primitive structure could receive its micromechanics properties including strength and elastic modulus [39]. A similar tendency can be found in the maximum midpoint displacement responses.…”

From Threat to Challenge: Understanding the Impact of Historical Collective Trauma on Contemporary Intergroup Conflict

“…The equivalent entity method is well established in the literature [41], to address the challenges (in consideration of the computation time and accuracy) arise from the complex porous FE modeling. Published literature [42] has confirmed the validity of such method in analyzing the dynamic properties of complex porous structures. Stress-mapping method [43] was used (see Figure S5) to achieve balanced simulation accuracy and computational speed.…”