Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Applied Mechanics and Engineering

2 1999

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Some observations on degradation processes in roller and polymer based bridge bearings

Hooper R. M., Henshall J. L., Rogers E.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

219-224

The investigation of failed roller bearings from two bridges has shown that the main source of failure is associated with the materials selection where a low toughness material has lead to significant failures. Laboratory tests show that in the contact of the stainless steel plate and PTFE bearing, creep effects will contribute to the interaction of asperities for extended periods of time and lead to a more intimate contact between the two components. In addition there may be problems with fretting/corrosion of stainless steel in PTFE bearings.

Fretting wear of total hip replacement femoral systems

Cook J. E., Lee A. J. C., Hooper R. M., Howell J.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

121-126

This paper reports results from an on-going programme investigating the wear processes in cemented femoral stems and includes clinical studies and appropriate parallel laboratory tests. A number of femoral stem components removed during revision surgery have been examined and a consistent pattern of wear has been observed. Micromovement between a bone cement specimen and the metal substrate has been studied using a micro-sliding apparatus. Apparatus has been developed where axial and torsional forces can be applied to a femoral stem mounted in bone cement. The morphology and location of clinical wear damage has been successfully replicated on the femoral stems. The observed wear has been interpreted in terms of a fretting-like process between the prosthesis and the cement mantle.