Failure mechanisms of additively manufactured porous biomaterials: Effects of porosity and type of unit cell

Kadkhodapour, Javad; Montazerian, Hossein; Darabi, Ali; Anaraki, Ali Pourkamali; Ahmadi, S.M.; Zadpoor, Amir A.; Schmauder, Siegfried

doi:10.1016/j.jmbbm.2015.06.012

Cited by 280 publications

(143 citation statements)

References 47 publications

Supporting

Mentioning

130

Contrasting

Order By: Relevance

“…This is in accordance with the results of Cheng et al [64], Xiao et al [65] and Li et al [23]. Using computationally predicted deformation models, Kadkhodapour et al [66] show that a layer-by-layer failure mechanism applies to stretch-dominated structures (i.e., cubic unit cell) while bending-dominated structures (i.e., twisted, pyramidal) show shear bands at 45˝. Due to the geometrical variation of the structural design, the elastic modulus could be varied between 7 GPa and approximately 22 GPa for the cubic design, between 3 GPa and approximately 7 GPa for the pyramidal design and between 17 GPa and 26 GPa for the twisted design.…”

Section: Discussionsupporting

confidence: 91%

Specific Yielding of Selective Laser-Melted Ti6Al4V Open-Porous Scaffolds as a Function of Unit Cell Design and Dimensions

Weißmann

Wieding

Hansmann

et al. 2016

Metals

View full text Add to dashboard Cite

Bone loss in the near-vicinity of implants can be a consequence of stress shielding due to stiffness mismatch. This can be avoided by reducing implant stiffness, i.e., by implementing an open-porous structure. Three open-porous designs were therefore investigated (cubic, pyramidal and a twisted design). Scaffolds were fabricated by a selective laser-melting (SLM) process and material properties were determined by conducting uniaxial compression testing. The calculated elastic modulus values for the scaffolds varied between 3.4 and 26.3 GP and the scaffold porosities between 43% and 80%. A proportional linear correlation was found between the elastic modulus and the geometrical parameters, between the elastic modulus and the compressive strengths, as well as between the strut width-to-diameter ratio (a/d) and elastic modulus. Furthermore, we found a power-law relationship between porosity and the modulus of elasticity that characterizes specific yielding. With respect to scaffold porosity, the description of specific yielding behaviour offers a simple way to characterize the mechanical properties of open-porous structures and helps generate scaffolds with properties specific to their intended application. A direct comparison with human bone parameters is also possible. We generated scaffolds with mechanical properties sufficiently close to that of human cortical bone.

show abstract

Section: Discussionsupporting

confidence: 91%

Specific Yielding of Selective Laser-Melted Ti6Al4V Open-Porous Scaffolds as a Function of Unit Cell Design and Dimensions

Weißmann

Wieding

Hansmann

et al. 2016

Metals

View full text Add to dashboard Cite

show abstract

“…To understand the failure mechanisms of different lattice structures, as experimentally observed, Kadkhodapour et al [98] implemented John-Cook plasticity and damage model in the cubic and diamond unit cell FE models based on the CAD design to simulate the failure behavior of Ti-6Al-4V scaffolds under compression. Their results obtained from FE simulations are shown in Figure 3.…”

Section: Computational and Experimental Studies On Bte Scaffoldsmentioning

confidence: 99%

“…Shearing of layers is accompanied by the bending failure of tying struts perpendicular to the diagonal plates; and ( b ) the cubic lattice structure; layer-by-layer deformation mechanism is confirmed by stretch-dominated deformation in scaling law analysis [98]. …”

Section: Figurementioning

confidence: 99%

Additively Manufactured Scaffolds for Bone Tissue Engineering and the Prediction of their Mechanical Behavior: A Review

2017

View full text Add to dashboard Cite

Additive manufacturing (AM), nowadays commonly known as 3D printing, is a revolutionary materials processing technology, particularly suitable for the production of low-volume parts with high shape complexities and often with multiple functions. As such, it holds great promise for the fabrication of patient-specific implants. In recent years, remarkable progress has been made in implementing AM in the bio-fabrication field. This paper presents an overview on the state-of-the-art AM technology for bone tissue engineering (BTE) scaffolds, with a particular focus on the AM scaffolds made of metallic biomaterials. It starts with a brief description of architecture design strategies to meet the biological and mechanical property requirements of scaffolds. Then, it summarizes the working principles, advantages and limitations of each of AM methods suitable for creating porous structures and manufacturing scaffolds from powdered materials. It elaborates on the finite-element (FE) analysis applied to predict the mechanical behavior of AM scaffolds, as well as the effect of the architectural design of porous structure on its mechanical properties. The review ends up with the authors’ view on the current challenges and further research directions.

show abstract

“…11, showing how the value of E changes with the relative density of a series of randomly-structured porous samples made from non-alloyed titanium. The majority of reported data Data are from [15, 20, 22, 25, 35, 41, 47, 55-57, 60, 66, 67, 90-100] [73,[101][102][103][104][105][106][107][108][109][110] . Fig.…”

Section: Uniaxialmentioning

confidence: 99%

Open Celled Porous Titanium

Shbeh

Goodall

2017

Adv Eng Mater

View full text Add to dashboard Cite

[**] One of the authours (MMS) would like to acknowledge a studentship from the Iraqi Ministry of Higher Education and Scientific Research.Among the porous metals, those made of titanium attract particular attention due to the interesting properties of this element. This review examines the state of research understanding and technological development of these materials, in terms of processing capability, resultant structure and properties and the most advanced applications under development. The impact of the rise of additive manufacturing techniques on these materials is discussed, along with the likely future directions required for these materials to find practical applications on a large scale.

show abstract

Failure mechanisms of additively manufactured porous biomaterials: Effects of porosity and type of unit cell

Cited by 280 publications

References 47 publications

Specific Yielding of Selective Laser-Melted Ti6Al4V Open-Porous Scaffolds as a Function of Unit Cell Design and Dimensions

Specific Yielding of Selective Laser-Melted Ti6Al4V Open-Porous Scaffolds as a Function of Unit Cell Design and Dimensions

Additively Manufactured Scaffolds for Bone Tissue Engineering and the Prediction of their Mechanical Behavior: A Review

Open Celled Porous Titanium

Contact Info

Product

Resources

About