| Popis: |
Titanium has been widely used for medical implants and restorations due to its excellent osseointegration, corrosion resistance, biocompatibility in biological fluids, and high resistance/weight ratio. The aim of this paper is to determine the fracture properties of two bone implants of a hip prosthesis made from commercially pure titanium and Ti-6Al-4V titanium alloy. Both bone implants were before fracture mechanics testing corroded by simulated body fluid. The presence of different microstructures along the pre-crack fatigue front has significant effects on the critical crack tip opening displacement (CTOD). The CTOD values were calculated in accordance with standard ASTM E1290-08e1. This value can be the relevant parameter for the safe servicing of hip prostheses. Titan se v veliki meri uporablja za medicinske implantante in obnavljanje že vgrajenih sklopov zaradi dobre trdnosti, korozijske obstojnosti in biokompatibilnosti v bioloških tekočinah in visoke odpornosti glede na njegovo težo. Namen članka je določitev lomnih lastnosti dveh kostnih implantantov, ki sta vgrajena v protezo kolka in narejena iz komercialno čistega titana in titanove zlitine Ti%6Al%4V. Kostna implantanta sta bila pred lomnomehanskim preizkušanjem korodirana s simulirano telesno tekočino. Prisotnost različnih mikrostruktur na fronti utrujenostne razpoke ima pomemben vpliv na kritično odpiranje konice razpoke (CTOD). CTOD vrednosti so izračunane v skladu s standardom ASTM E1290-08e1. Ta vrednost je lahko relevanten parameter za varno uporabo protez kolka. |
