Stiffness and strength tailoring of cobalt chromium graded cellular structures for stress-shielding reduction
| Autor: | Sakkadech Limmahakhun, Cheng Yan, Kriskrai Sitthiseripratip, Yin Xiao, Adekunle Oloyede |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
medicine.medical_treatment chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Stress (mechanics) Chromium medicine lcsh:TA401-492 General Materials Science Composite material Selective laser melting Porosity Reduction (orthopedic surgery) business.industry Mechanical Engineering Stiffness Structural engineering Stress shielding 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials lcsh:Materials of engineering and construction. Mechanics of materials medicine.symptom 0210 nano-technology business Cobalt |
| Zdroj: | Materials & Design, Vol 114, Iss, Pp 633-641 (2017) |
| ISSN: | 0264-1275 |
| Popis: | The use of cobalt chromium (CoCr) in orthopaedic joint replacement shields the peri-implant bone stress, contributing to a premature loosening of the implants. In order to reduce the need for revision surgeries, light weight implants with tailored functionalities need to be developed. In this study, the compressive mechanical properties of laser-melted CoCr cellular structures with a pillar octahedral architecture [0° ± 45°] were investigated. Four types of graded cellular structures, based on grading orientations along radial and longitudinal planes, were manufactured using selective laser melting techniques. The cellular structures in this study have the mechanical properties (E = 2.3–3.1 GPa, σ = 113–523 MPa) compatible with bone structures. Grading a porosity of the CoCr cellular structures provides a greater stress transfer to the proximal peri-implant area. The axially graded cellular structures demonstrated significant reduction of the peri-implant stress shielding. Incorporation of CoCr graded cellular structures into a structure like femoral stems is expected to have the potential to reduce the revision surgeries. Keywords: Functionally graded cellular structures, Selective laser melting, Stress shielding, Mechanical properties, Cobalt chromium |
| Databáze: | OpenAIRE |
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