| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tozzi, Gianluca
University of Greenwich
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024Biofabrication of nanocomposite-based scaffolds containing human bone extracellular matrix for the differentiation of skeletal stem and progenitor cellscitations
- 2023Biofabrication of nanocomposite-based scaffolds containing human bone extracellular matrix for the differentiation of skeletal stem and progenitor cellscitations
- 2022Nonlinear micro finite element models based on digital volume correlation measurements predict early microdamage in newly formed bonecitations
- 2021Multi-scale mechanical and morphological characterisation of sintered porous magnesium-based scaffolds for bone regeneration in critical-sized defectscitations
- 2021Time-resolved in situ synchrotron-microCTcitations
- 2020Flexural resistance of CAD/CAM blocks. Part 3: polymer-based restorative materials for permanent restorations
- 2020Low-cycle full-field residual strains in cortical bone and their influence on tissue fracture evaluated via in situ stepwise and continuous X-ray computed tomographycitations
- 2019Anisotropic crack propagation and deformation in dentin observed by four-dimensional X-ray nano-computed tomographycitations
- 2019Sustained release from injectable composite gels loaded with silver nanowires designed to combat bacterial resistance in bone regeneration applicationscitations
- 2017Precision of digital volume correlation approaches for strain analysis in bone imaged with micro-computed tomography at different dimensional levelscitations
- 20174D printing biomimetic tissue structures using correlative approaches
- 2016Morphological and mechanical biomimetic bone structurescitations
- 2012Compressive fatigue behaviour of bovine cancellous bone and bone analogous materials under multi-step loading conditionscitations
Places of action
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article
Anisotropic crack propagation and deformation in dentin observed by four-dimensional X-ray nano-computed tomography
Abstract
Understanding the cracking behaviour of biological composite materials is of practical importance. This paper presents the first study to track the interplay between crack initiation, microfracture and plastic deformation in three dimensions (3D) as a function of tubule and collagen fibrils arrangement in elephant dentin using in situ X-ray nano-computed tomography (nano-CT). A nano-indenter with a conical tip has been used to incrementally indent three test-pieces oriented at 0°, 45° and 70° to the long axis of the tubules (i.e. radial to the tusk). For the 0° sample two significant cracks formed, one of which linked up with microcracks in the axial-radial plane of the tusk originating from the tubules and the other one occurred as a consequence of shear deformation at the tubules. The 70° test-piece was able to bear the greatest loads despite many small cracks forming around the indenter. These were diverted by the microstructure and did not propagate significantly. The 45° test-piece showed intermediate behaviour. In all cases strains obtained by digital volume correlation were well in excess of the yield strain (0.9%), indeed some plastic deformation could even be seen through bending of the tubules. The hoop strains around the conical indenter were anisotropic with the smallest strains correlating with the primary collagen orientation (axial to the tusk) and the largest strains aligned with the hoop direction of the tusk.