Technical errors are the commonest cause of dislocation of hip prostheses (Hamblen 1984). An excessively anteverted or retroverted acetabular component is often responsible. The deleterious effects of such malposition have been documented by Ackland, Bourne and Uhthoff (1986), Fackler and Poss (1980) and Lewinnek et ab (1978). These workers were abbe to measure anteversion or retroversion by ut...

Prediction of the mechanical behavior of thin foils (~25 µm) requires special characterization techniques. The current work is focused on the mechanical and microstructural characterization of 25 µm HAVAR alloy foils following annealing, cold rolling, and subsequent heat treatments, using small punch testing (SPT), X-ray diffraction (XRD), and transmission-scanning electron microscopy (TEM). Th...

The velocity of selectively-introduced edge dislocations in 99.999 percent pure copper crystals has been measured as a function of stress at temperatures from 66°K to 373°K by means of a torsion technique. The range of resolved shear stress was 0 to 15 megadynes/cm2 for seven temperatures (66°K, 74°K, 83°K, 123°K, 173°K, 296 °K, 373°K). Dislocation mobility is characterized by two distinct feat...

This letter is concerned with an interfacial edge crack in a piezoelectric bimaterial wedge interacting with a screw dislocation under antiplane mechanical and in-plane electric loading. In addition to a discontinuous electric potential across the slip plane, the dislocation is subjected to a line-force and a line-charge at the tip. The out-of-plane displacement and electric potentials are obta...