Computer Methods in Biomechanics and Biomedical Engineering by Amit Gefen & Daphne Weihs

Author:Amit Gefen & Daphne Weihs
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Measurement System

Two displacement transducers were custom-made to measure diametral cup displacement along two mutually perpendicular axes at the rim of the cup. The displacement transducers were made out of 15 mm wide, aluminium alloy strips bent into a semi-circular shape with two strain gauges (Vishay Micro-Measurements, Malvern, PA) adhered to the top and bottom, respectively, of each transducer and connected in a full Wheatstone bridge network.

Four fixtures were used to secure the ends of each transducer to the cup. Each fixture was glued to the inside wall of the cup using epoxy and the transducer was secured to the fixture with a screw. One transducer (“Axial”) was used to measure the displacement along the direction of the pinch/press-fit force while the second transducer (“Transverse”) was used to measure the transverse displacement (Fig. 1).

Fig. 1Schematic showing displacement transducers and strain gauge configuration in the acetabular cup. The Axial displacement transducer measured the displacement along the direction of the pinch/press-fit force. The transverse displacement transducer measured the displacement transverse to the direction of the pinch/press-fit force. The strain gauge was oriented to measure strains parallel to the rim

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