Combining micro computed tomography and three-dimensional registration to evaluate local strains in shape memory scaffolds
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Autor:innen
Bormann, Therese
Schulz, Georg
Deyhle, Hans
Beckmann, Felix
Münch, Christoph
Hoffmann, Waldemar
Müller, Bert
Autor:in (Körperschaft)
Publikationsdatum
02/2014
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Acta Biomaterialia
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
10
Ausgabe / Nummer
2
Seiten / Dauer
1024-1034
Patentnummer
Verlag / Herausgebende Institution
Elsevier
Verlagsort / Veranstaltungsort
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Appropriate mechanical stimulation of bony tissue enhances osseointegration of load-bearing implants. Uniaxial compression of porous implants locally results in tensile and compressive strains. Their experimental determination is the objective of this study. Selective laser melting is applied to produce open-porous NiTi scaffolds of cubic units. To measure displacement and strain fields within the compressed scaffold, the authors took advantage of synchrotron radiation-based micro computed tomography during temperature increase and non-rigid three-dimensional data registration. Uniaxial scaffold compression of 6% led to local compressive and tensile strains of up to 15%. The experiments validate modeling by means of the finite element method. Increasing the temperature during the tomography experiment from 15 to 37 °C at a rate of 4 K h−1, one can locally identify the phase transition from martensite to austenite. It starts at ∼24 °C on the scaffolds bottom, proceeds up towards the top and terminates at ∼34 °C on the periphery of the scaffold. The results allow not only design optimization of the scaffold architecture, but also estimation of maximal displacements before cracks are initiated and of optimized mechanical stimuli around porous metallic load-bearing implants within the physiological temperature range.
Schlagwörter
NiTi, Scaffold Compression, Variable Temperature Tomography, Digital Volume Correlation, Three-Dimensional Displacement Field
Fachgebiet (DDC)
600 - Technik, Medizin, angewandte Wissenschaften
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
1742-7061
1878-7568
1878-7568
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Closed
Lizenz
Zitation
BORMANN, Therese, Georg SCHULZ, Hans DEYHLE, Felix BECKMANN, Michael DE WILD, Jürg KÜFFER, Christoph MÜNCH, Waldemar HOFFMANN und Bert MÜLLER, 2014. Combining micro computed tomography and three-dimensional registration to evaluate local strains in shape memory scaffolds. Acta Biomaterialia. Februar 2014. Bd. 10, Nr. 2, S. 1024–1034. DOI 10.1016/j.actbio.2013.11.007. Verfügbar unter: https://irf.fhnw.ch/handle/11654/45805