Effects of hollow structures added by selective laser sintering on the mechanical properties of Co-Cr alloy

Okano, Haruna; Tasaka, Akinori; Matsunaga, Satoru; Kasahara, Masaaki; Wadachi, Juro; Hattori, Masayuki; Abe, Shinichi; Yamashita, Shuichiro

doi:10.2186/jpr.jpr_d_22_00150

Cited by 2 publications

(1 citation statement)

References 39 publications

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“…The internally integrated hollow structures can decrease the mass of the additively manufactured objects due to the apparent reduction in density, consequently reducing the cost and period of the printing procedure. 30 31 These results are consistent with previous studies that confirmed a significant mass reduction when hollow structures are incorporated inside the printed object relative to the reduction in density of the item. 32 33 …”

Section: Discussionsupporting

confidence: 91%

The role of internal architecture in producing high-strength 3D printed cobalt-chromium objects

Mohammed,

Al-Ali

2024

J Adv Prosthodont

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PURPOSE The objectives of the current study were to estimate the influence of self-reinforced hollow structures with a graded density on the dimensional accuracy, weight, and mechanical properties of Co-Cr objects printed with the direct metal laser sintering (DMLS) technique. MATERIALS AND METHODS Sixty-five dog-bone samples were manufactured to evaluate the dimensional accuracy of printing, weight, and tensile properties of DMLS printed Co-Cr. They were divided into Group 1 (control) (n = 5), Group 2, 3, and 4 with incorporated hollow structures based on (spherical, elliptical, and diamond) shapes; they were subdivided into subgroups (n = 5) according to the volumetric reduction (10%, 15%, 20% and 25%). Radiographic imaging and microscopic analysis of the fractographs were conducted to validate the created geometries; the dimensional accuracy, weight, yield tensile strength, and modulus of elasticity were calculated. The data were estimated by one-way ANOVA and Duncan’s tests at P < .05. RESULTS The accuracy test showed an insignificant difference in the x, y, z directions in all printed groups. The weight was significantly reduced proportionally to the reduced volume fraction. The yield strength and elastic modulus of the control group and Group 2 at 10% volume reduction were comparable and significantly higher than the other subgroups. CONCLUSION The printing accuracy was not affected by the presence or type of the hollow geometry. The weight of Group 2 at 10% reduction was significantly lower than that of the control group. The yield strength and elastic modulus of the Group 2 at a 10% reduction showed means equivalent to the compact objects and were significantly higher than other subgroups.

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Section: Discussionsupporting

confidence: 91%

The role of internal architecture in producing high-strength 3D printed cobalt-chromium objects

Mohammed,

Al-Ali

2024

J Adv Prosthodont

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The influence of internally architected voids in the creation of high-strength, low-weight 3D-printed cobalt-chromium prototypes

Mohammed,

Al-Ali

2024

Dental Research Journal

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Background: The additive manufacturing technology made the topology optimization technique feasible. This technique can indefinitely reduce the weight of the printed items with a promising increase in the mechanical properties of that item. Materials and Methods: In the current experimental study, 50 samples were fabricated for a 3-point bending test. They were divided into ( n = 5) as a control Group 1 free of internal geometries, ( n = 15) for each of Groups 2-4, and they were subdivided into ( n = 5) for each percentage of reduction per volume (10%, 15%, and 20%). Spherical, ovoid, and diamond shapes were each group's fundamental geometries, respectively. Cylindrical tunnels connected the voids in each group. Radiographic images were performed to validate the created geometries, the weight was measured, and flexural strength and modulus of elasticity were calculated. Data were analyzed by one-way ANOVA and Duncan's post hoc tests at P <s 0.05. Results: The weight results showed a significant reduction in mass. The flexural strength of Group 2 at a 10% reduction per volume had the highest mean significantly without compromising the elastic modulus. In comparison, the means of group 4 at 20% reduction showed the lowest level of toughness. Conclusion: The weight was reduced according to the reduction percentage. The flexural strength of Group 2 at a 10% reduction showed the highest degree of toughness among all groups. The void shape and density influenced the mechanical properties tested.

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Effects of hollow structures added by selective laser sintering on the mechanical properties of Co-Cr alloy

Cited by 2 publications

References 39 publications

The role of internal architecture in producing high-strength 3D printed cobalt-chromium objects

The role of internal architecture in producing high-strength 3D printed cobalt-chromium objects

The influence of internally architected voids in the creation of high-strength, low-weight 3D-printed cobalt-chromium prototypes

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