Compressive deformation behavior and energy absorption characteristic of additively manufactured sheet CoCrMo triply periodic minimal surface lattices

Park, So‐Yeon; Kim, Kyu‐Sik; AlMangour, Bandar; Grzesiak, Dariusz; Lee, Kee‐Ahn

doi:10.1016/j.jmrt.2022.02.086

Cited by 21 publications

(6 citation statements)

References 47 publications

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“…In compression, the neovius specimens showed gradual collapse, better energy absorption efficiency, and higher yield strength than schoen specimens. 25,26 Thin-walled shell-type lattice structures, which are hollow, show energy abortion greater than solid lattice structures. 27 The stiffness of the lattice structures depends significantly on the size and shape of the struts or beams.…”

Section: Introductionmentioning

confidence: 99%

Enhanced flexural strength-to-weight ratio of Inconel718 lattice structure parts made of powder bed fusion process

Veeraiahgari,

Regalla,

Kurra

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The present work investigates the enhancement of the flexural strength-to-weight ratio on the lattice structure of additively manufactured Inconel-718 parts made using the powder bed fusion (PBF) process. ASTM-E290 standard three-point bending experiments and finite element modeling were conducted on solid and lattice structure parts. Four novel lattice structure unit cells with positive Maxwell’s number for stretch-dominant mechanical behavior were designed and used in the three-point bending specimens. The different lattice structure types investigated are strengthened-cubic (named Model_1), strengthened-cubic + kagome (named Model_2), strengthened-cubic + octet truss (named Model_3), and strengthened-cubic + kagome+octet truss (named as Model_4). Results obtained for the lattice structure specimens were compared with those obtained for solid specimens. The study revealed significant differences in strength-to-weight ratio among them, proving the tremendous potential of lattice structures in flexural loading applications by giving higher strength-to-weight ratios than solid specimens. Out of the four lattice structures and one solid structure investigated, Model_2 with only angular beams and Model_3 with only interior beams gave a better strength-to-weight ratio than solid specimens. Model_2 and Model_3 have beams along the unit cell’s body diagonal, leading to better performance. Out of all the lattice-structured specimens, Model_2 showed the highest strength-to-weight ratio. In the finite element model, the maximum equivalent strain was used as the criterion for failure. The failure sites found by finite element simulation coincided with those in the experiments.

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Section: Introductionmentioning

confidence: 99%

Enhanced flexural strength-to-weight ratio of Inconel718 lattice structure parts made of powder bed fusion process

Veeraiahgari,

Regalla,

Kurra

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Moreover, it was observed that no studies have focused on the mechanical properties of Gyroid, Diamond, and Primitive lattice structures produced by LPBF from CoCrMo material so far. In their study, Park et al [31] used CoCrMo powder material to produce IWP and Neovius TPMS structures with the LPBF method and compared the mechanical properties of these lattices under compression.…”

Section: Introductionmentioning

confidence: 99%

Effect of Build Parameters on the Compressive Behavior of Additive Manufactured CoCrMo Lattice Parts Based on Experimental Design

Gülcan¹,

Şimşek²,

Cokgunlu

et al. 2022

Metals

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Due to their high specific strength, toughness, and corrosion and wear resistance characteristics, CoCrMo alloys are widely used in different industries and applications: wind turbines and jet-engine components, orthopedic implants, dental crowns, etc. The aim of this paper is to investigate the effect of lattice parameters on the compressive behavior of laser powder bed fusion (LPBF) parts from CoCrMo material. Build orientation, volume fraction, and lattice type are chosen as input parameters or control factors, and compressive yield strength (σy), elastic modulus (E), and specific energy absorption are chosen as the output or performance parameters for optimization. The Taguchi experimental design method is used in the arrangement of lattice parameters during experimental studies. The level of importance of the lattice parameters on σy, E, and specific energy absorption is determined by using analysis of variance (ANOVA). At the same material volume fractions, Diamond specimens showed higher σy and specific energy absorption than Gyroid and Primitive specimens, except σy at 0.4 volume fraction, where a Gyroid specimen showed the best result. The experimental and statistical results revealed that volume fraction and build orientation were found to be the major and minor effective factors, respectively, for all performance parameters (σy, E, and specific energy absorption). The effect of volume fraction on σy, E, and specific energy absorption was found to be 85.11%, 91.83%, and 57.71%, respectively. Lattice type was found to be the second-ranking factor, affecting σy, E, and specific energy absorption with contributions of 11.04%, 6.98%, and 39.40%, respectively. Multi objective optimization based on grey relation analysis showed that a Diamond specimen with 0.4 volume fraction and 45° build orientation was the best parameter set for the investigated performance outputs.

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“…Doty et al [ 19 ] designed a hierarchical lattice structure, and compression experiments showed that this structure could enhance the specific plateau stress. Park et al [ 20,21 ] used power bed fusion to fabricate CoCrMo sheet triply periodic minimal surface lattices with Neovius topologies. The results of the compression tests demonstrated that the Neovius lattice had outstanding energy absorption characteristics.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Study of Energy Absorption Characteristics and Deformation Mechanism of Stretching–Bending Synergistic Lattices Under Dynamic Compression

Yang

Liu

et al. 2022

Adv Eng Mater

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The 3D lattice structures have the characteristics of lightweight and high strength, showing good energy absorption characteristics under impact loads. Herein, stretching–bending synergistic lattices are constructed, with the macroscopic backbone in the stretching‐dominated configuration and the mesoscopic cells in the bending‐dominated configuration. The lattices organically combine the two deformation mechanisms of stretching dominant and bending dominant to exhibit high specific strength and excellent specific energy absorption. The particular deformation model and energy absorption characteristics of the stretching–bending synergistic lattices are analyzed. The dynamic compression response of the structure is found to have a unique stress climbing mechanism, which is the critical factor in enhancing its energy absorption ability. The backbone is the main part of structural energy absorption. By changing the relative density of the backbone, the yield strength and specific energy absorption of the stretching–bending synergistic lattices can be increased by more than 78% and 142%, respectively, than the uniform lattices with the same relative density. The hierarchical structure of the stretching backbone and bending cells provides a new approach for the design of impact‐resistant structures.

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Compressive deformation behavior and energy absorption characteristic of additively manufactured sheet CoCrMo triply periodic minimal surface lattices

Cited by 21 publications

References 47 publications

Enhanced flexural strength-to-weight ratio of Inconel718 lattice structure parts made of powder bed fusion process

Enhanced flexural strength-to-weight ratio of Inconel718 lattice structure parts made of powder bed fusion process

Effect of Build Parameters on the Compressive Behavior of Additive Manufactured CoCrMo Lattice Parts Based on Experimental Design

Study of Energy Absorption Characteristics and Deformation Mechanism of Stretching–Bending Synergistic Lattices Under Dynamic Compression

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