Comparison of 3D printed trabecular structure with porous plasma spray: A method based on mapping the local modulus of elasticity

Abstract Composites are the revolutionary materials that were developed for the ease of the technology. Similar to all families of materials, composites are being extensively studied nowadays. One of the composites ‘main studies is the homogenization study to determine composites modulus of elasticity function of multiple variables based on differentiating several inclusions’ geometries, or quantities or orientations. However, homogenization studies require extensive numerical and analytical work. This work uses a statistical optimized tool TSREG (tabu search combined with statistical regression proven to achieve models with the highest R-squared and lowest p-values for each variable in addition to the lowest MAPE (mean absolute percentage error)) to predict a model relating composite modulus of elasticity to inclusions shape (as aspect ratio), volume fraction, and orientation (0-30-60-90°). Experimental data of modulus of elasticity compressed 3D printed ABS plastics cubes of 16 × 16 × 16 mm3 size having one inclusion (as empty spheres or ellipsoids with zero Young’s modulus) were utilized. For the voids, their geometries were varied to cover spherical and elliptical shapes with several aspect ratios (0.2-0.4-0.65-0.75-0.9-1), volume fractions (0-0.1-0.2-0.3-0.35-0.4-0.5-1), and orientations (0-30-60-90°). This model helps researchers to determine the composite modulus of elasticity using one significant and accurate expression without using numerical analysis.

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Influence of printing direction on 3D printed ABS specimens

Production Engineering Archives ◽

10.30657/pea.2020.26.24 ◽

2020 ◽

Vol 26 (3) ◽

pp. 127-130

Author(s):

Nassim Markiz ◽

Eszter Horváth ◽

Péter Ficzere

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Additive Manufacturing ◽

Ultimate Tensile Strength ◽

Modulus Of Elasticity ◽

Tensile Tests ◽

Standard Test ◽

Complex Objects ◽

3D Printed ◽

Printing Direction

AbstractIn the recent years, additive manufacturing became an interesting topic in many fields due to the ease of manufacturing complex objects. However, it is impossible to determine the mechanical properties of any additive manufacturing parts without testing them. In this work, the mechanical properties with focus on ultimate tensile strength and modulus of elasticity of 3D printed acrylonitrile butadi-ene styrene (ABS) specimens were investigated. The tensile tests were carried using Zwick Z005 loading machine with a capacity of 5KN according to the American Society for Testing and Materials (ASTM) D638 standard test methods for tensile properties of plastics. The aim of this study is to investigate the influence of printing direction on the mechanical properties of the printed specimens. Thus, for each printing direction ( and ), five specimens were printed. Tensile testing of the 3D printed ABS specimens showed that the printing direction made the strongest specimen at an ultimate tensile strength of 22 MPa while at printing direction it showed 12 MPa. No influence on the modulus of elasticity was noticed. The experimental results are presented in the manuscript.

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RELATIONSHIP BETWEEN GLOBAL AND LOCAL MODULUS OF ELASTICITY IN BEAMS OF ARGENTINEAN Eucalyptus grandis

Maderas Ciencia y tecnología ◽

10.4067/s0718-221x2003000200002 ◽

2003 ◽

Vol 5 (2) ◽

Cited By ~ 2

Author(s):

J.C PITER ◽

R.L ZERBINO ◽

H.J BLAß

Keyword(s):

Modulus Of Elasticity ◽

Eucalyptus Grandis ◽

Local Modulus ◽

Global And Local

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Plasma Spray vs. Electrochemical Deposition: Toward a Better Osteogenic Effect of Hydroxyapatite Coatings on 3D-Printed Titanium Scaffolds

Frontiers in Bioengineering and Biotechnology ◽

10.3389/fbioe.2021.705774 ◽

2021 ◽

Vol 9 ◽

Author(s):

Yang Sun ◽

Xing Zhang ◽

Mingran Luo ◽

Weifan Hu ◽

Li Zheng ◽

...

Keyword(s):

Electrochemical Deposition ◽

Plasma Spray ◽

Bone Repair ◽

Three Dimensional ◽

Repair Capacity ◽

Electrochemically Deposited ◽

3D Printed ◽

Plasma Sprayed

Surface modification of three-dimensional (3D)-printed titanium (Ti) scaffolds with hydroxyapatite (HA) has been a research hotspot in biomedical engineering. However, unlike HA coatings on a plain surface, 3D-printed Ti scaffolds have inherent porous structures that influence the characteristics of HA coatings and osteointegration. In the present study, HA coatings were successfully fabricated on 3D-printed Ti scaffolds using plasma spray and electrochemical deposition, named plasma sprayed HA (PSHA) and electrochemically deposited HA (EDHA), respectively. Compared to EDHA scaffolds, HA coatings on PSHA scaffolds were smooth and continuous. In vitro cell studies confirmed that PSHA scaffolds have better potential to promote bone mesenchymal stem cell adhesion, proliferation, and osteogenic differentiation than EDHA scaffolds in the early and late stages. Moreover, in vivo studies showed that PSHA scaffolds were endowed with superior bone repair capacity. Although the EDHA technology is simpler and more controllable, its limitation due to the crystalline and HA structures needs to be improved in the future. Thus, we believe that plasma spray is a better choice for fabricating HA coatings on implanted scaffolds, which may become a promising method for treating bone defects.

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NUMERICAL AND MECHANICAL ANALYSES OF A 3D-PRINTED TITANIUM TRABECULAR DENTAL IMPLANT

Acta Polytechnica ◽

10.14311/ap.2017.57.0218 ◽

2017 ◽

Vol 57 (3) ◽

pp. 218-228

Author(s):

Luboš Řehounek ◽

Aleš Jíra

Keyword(s):

Mechanical Properties ◽

Numerical Model ◽

3D Printing ◽

Prostheses And Implants ◽

Trabecular Structure ◽

Compression Tests ◽

A Value ◽

Printing Technique ◽

3D Printed ◽

3D Printing Technique

The main focus of this paper is to investigate and describe a novel biomaterial structure. The trabecular structure has only recently been recognized as a viable alternative for prostheses and implants and seems to have very promising biocompatibility and mechanical properties. The 3D printing technique was used to create test specimens. These specimens were then tested by nanoindentation and tensile and compression tests. A numerical model was created and curve-fitted to represent the mechanical behavior of the trabecular structure. A significant reduction in the values of Young’s modulus <em>E</em> was observed. The values of <em>E</em> for conventional implant materials are approximately 110–120GPa and the trabecular structure reached a value just below 1GPa. The next effort will be to apply the model onto a real implant. It is the “four leaf clover” implant variant by authors F. Denk Jr., A. Jíra and F. Denk Sr.

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Determination of the Elasticity Modulus of 3D-Printed Octet-Truss Structures for Use in Porous Prosthesis Implants

Materials ◽

10.3390/ma11122420 ◽

2018 ◽

Vol 11 (12) ◽

pp. 2420 ◽

Cited By ~ 10

Author(s):

Ali Bagheri ◽

Irene Buj-Corral ◽

Miquel Ferrer ◽

Maria Magdalena Pastor ◽

Francesc Roure

Keyword(s):

Tissue Engineering ◽

Modulus Of Elasticity ◽

Elasticity Modulus ◽

Solid Material ◽

Truss Structures ◽

Compression Tests ◽

Tissue Engineering Scaffolds ◽

Octet Truss ◽

3D Printed

In tissue engineering, scaffolds can be obtained by means of 3D printing. Different structures are used in order to reduce the stiffness of the solid material. The present article analyzes the mechanical behavior of octet-truss microstructures. Three different octet structures with strut radii of 0.4, 0.5, and 0.6 mm were studied. The theoretical relative densities corresponding to these structures were 34.7%, 48.3%, and 61.8%, respectively. Two different values for the ratio of height (H) to width (W) were considered, H/W = 2 and H/W = 4. Several specimens of each structure were printed, which had the shape of a square base prism. Compression tests were performed and the elasticity modulus (E) of the octet-truss lattice-structured material was determined, both, experimentally and by means of Finite Element Methods (FEM). The greater the strut radius, the higher the modulus of elasticity and the compressive strength. Better agreement was found between the experimental and the simulated modulus of elasticity results for H/W = 4 than for H/W = 2. The octet-truss lattice can be considered to be a promising structure for printing in the field of tissue engineering.

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