Fatigue crack propagation behavior of ultrahigh molecular weight polyethylene

摘要: The relative fatigue crack propagation resistance of plain and carbon fiber-reinforced ultrahigh molecular weight polyethylene (UHMWPE) was determined from cyclic loading tests performed on compact tension specimens machined the tibial components total knee prostheses. Both materials were characterized by dynamic mechanical spectroscopy, X-ray diffraction, differential scanning calorimetry. used in laboratory air at 5 Hz using a sinusoidal wave form. Dynamic spectroscopy showed that reinforced UHMWPE had higher elastic storage modulus than UHMWPE, whereas diffraction calorimetry percent crystallinity degree order crystalline regions similar for two materials. Fatigue both proved to be very sensitive small changes applied stress intensity range. A 10% increase resulted approximately an magnitude growth rate. found significantly worse UHMWPE. This result attributed poor bonding between fibers matrix ductile nature itself.