Compressive and fatigue behavior of functionally graded Ti-6Al-4V meshes fabricated by electron beam melting

Zhao, Shuai; Li, S.J.; Wang, S.G.; Hou, Wentao; Li, Y.; Zhang, Lai-Chang; Hao, Yulin; Yang, Rui; Misra, R.D.K.; Murr, Lawrence E.

doi:10.1016/j.actamat.2018.02.060

Cited by 184 publications

(56 citation statements)

References 55 publications

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“…The loose sintering (compaction pressure is not applied) is the extreme case (maximum porosity) of the PM route [32][33][34]. However, an excessive porosity and/or deficient sinterability (quality of the necks) of titanium powder at low temperatures, may compromise the mechanical behavior [35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Compaction Pressure and Sintering Temperature on the Mechanical Properties of Porous Titanium for Biomedical Applications

Castillo

Muñoz

Trueba

et al. 2019

Metals

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In the present work, the use of porous titanium is proposed as a solution to the difference in stiffness between the implant and bone tissue, avoiding the bone resorption. Conventional powder metallurgical technique is an industrially established route for fabrication of this type of material. The results are discussed in terms of the influence of compaction pressure and sintering temperature on the porosity (volumetric fraction, size, and morphology) and the quality of the sintering necks. A very good agreement between the predicted values obtained using a simple 2D finite element model, the experimental uniaxial compression behavior, and the analytical model proposed by Nielsen, has been found for both the Young’s modulus and the yield strength. The porous samples obtained by the loose sintering technique and using temperatures between 1000 °C −1100 °C (about 40% of total porosity) are recommended for achieving a suitable biomechanical behavior for cortical bone partial replacement.

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Section: Introductionmentioning

confidence: 99%

Influence of the Compaction Pressure and Sintering Temperature on the Mechanical Properties of Porous Titanium for Biomedical Applications

Castillo

Muñoz

Trueba

et al. 2019

Metals

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“…The mechanical behaviour of complex graded lattice structures is not easily modelled outside the elastic deformation regime, making it difficult to accurately predict failure behaviour beyond bulk or global deformations. In order to better understand lattice failure, simple linearly graded structures have been widely studied in vitro [111,112]. Under compression, sequential collapse of layers prior to full densification of structures has been observed in graded lattices, both with linear and curved gradients in density, with no significant difference in the mechanical response to static and dynamic compression testing [113,114].…”

Section: Macroscale Implant Design For Stress Shieldingmentioning

confidence: 99%

Clinical, industrial, and research perspectives on powder bed fusion additively manufactured metal implants

Lowther

Louth

Davey

et al. 2019

Additive Manufacturing

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A B S T R A C TFor over ten years, metallic skeletal endoprostheses have been produced in select cases by additive manufacturing (AM) and increasing awareness is driving demand for wider access to the technology. This review brings together key stakeholder perspectives on the translation of AM research; clinical application, ongoing research in the field of powder bed fusion, and the current regulatory framework. The current clinical use of AM is assessed, both on a mass-manufactured scale and bespoke application for patient specific implants. To illuminate the benefits to clinicians, a case study on the provision of custom cranioplasty is provided based on prosthetist testimony. Current progress in research is discussed, with immediate gains to be made through increased design freedom described at both meso-and macro-scale, as well as long-term goals in alloy development including bioactive materials. In all cases, focus is given to specific clinical challenges such as stress shielding and osseointegration. Outstanding challenges in industrialisation of AM are openly raised, with possible solutions assessed. Finally, overarching context is given with a review of the regulatory framework involved in translating AM implants, with particular emphasis placed on customisation within an orthopaedic remit. A viable future for AM of metal implants is presented, and it is suggested that continuing collaboration between all stakeholders will enable acceleration of the translation process. fection or surgical complications [11][12][13].Currently, the majority of skeletal endoprostheses are produced from titanium (Ti) or cobalt chromium (CoCr) based alloys, which meet the criteria of durability, strength, corrosion resistance and a low immune response [14,15]. These characteristics however come at the cost of the high stiffness of these alloys in comparison to bone. Mismatch between the mechanical properties of bone and orthopaedic materials

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“…49 Many research groups are therefore studying the properties of graded designs and their potential in meeting competing design requirements. 24,[50][51][52][53][54][55][56][57][58][59] Regardless of the type of design used, one of the first questions that we need to answer is ''what are the design requirements that AM porous biomaterials used as temporary or permanent bone substitutes need to satisfy?'' Once the design objectives are well defined, a host of analytical and computational techniques could be used to solve the inverse problem of finding the topological designs that best satisfy the design objectives.…”

Section: Introductionmentioning

confidence: 99%

Additively manufactured porous metallic biomaterials

Zadpoor

2019

J. Mater. Chem. B

165

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Compressive and fatigue behavior of functionally graded Ti-6Al-4V meshes fabricated by electron beam melting

Cited by 184 publications

References 55 publications

Influence of the Compaction Pressure and Sintering Temperature on the Mechanical Properties of Porous Titanium for Biomedical Applications

Influence of the Compaction Pressure and Sintering Temperature on the Mechanical Properties of Porous Titanium for Biomedical Applications

Clinical, industrial, and research perspectives on powder bed fusion additively manufactured metal implants

Additively manufactured porous metallic biomaterials

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