Effects of self heating when using a continuous bridge voltage for strain gauging epoxy models

Little, E. G.

doi:10.1111/j.1475-1305.1982.tb00422.x

Cited by 21 publications

(12 citation statements)

References 7 publications

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“…The technique initially proposed by Yakovlev and Inyutin [1] and by Brasier and Dove [2] has been developed and applied by many researchers [3–30]. The activity in the field of embedded strain gauges can be classified as follows:…”

Section: Introductionmentioning

confidence: 99%

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Embedded Strain Gauges: Effect of the Stress Normal to the Grid

Ajovalasit

2005

Strain

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In general, a strain gauge embedded in a model is subjected to a stress normal to the grid, whereas a gauge on the external surface is free from such a stress. This paper concerns the effect of the stress normal to the grid on the output of the strain gauge; usually, the influence of such a stress has a negligible effect, however, in some cases a notable influence has been noted. Therefore, the output of the strain gauge is determined in function of the strains in the plane of the gauge, ɛl and ɛt, and of the stress, σn, normal to the grid. The analysis shows that the output of the strain gauge is influenced by the coupled effect of transverse sensitivity and pressure sensitivity of the strain gauge. In particular, the analysis shows that, for Constantan gauges compensated for steel, the influence of the transverse sensitivity is in general prevailing on that one due to the pressure sensitivity. The results reported in this paper explain the experimental data obtained by various researchers.

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Section: Introductionmentioning

confidence: 99%

“…Evaluation of reinforcement effect [3, 6, 9, 10, 24, 29], transverse sensitivity [6], influence of the stress normal to the grid [6, 29, 30]. Power supplies of the gauges [9, 12, 19, 24, 29]. Pattern selection and performance evaluation of three‐dimensional rosettes [5, 7, 11, 13–16, 18, 25].…”

Section: Introductionmentioning

confidence: 99%

Embedded Strain Gauges: Effect of the Stress Normal to the Grid

Ajovalasit

2005

Strain

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“…A single gauge on each rosette was wired into a half bridge arrangement for tests at a power density of 2.1 mW/mm2. Tests carried out by Little (1982b) showed that gauges embedded into CT200/HT907 and energized at this power density do not exhibit detrimental heating effects. In order to overcome the effects of creep, the model was tested according to the procedure described by Stansfield (1976) and Meyer (1979).…”

Section: Section On a Amentioning

confidence: 91%

A Static Experimental Stress Analysis of a Single Plateau of the Geomedic® Knee Joint Using Embedded Strain Gauges

Little¹

1985

Engineering in Medicine

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The tibial component of the Geomedic@ knee joint is subject to a non-uniform stress distribution which tends to cause loosening from the substrate. An experimental stress analysis was carried out to establish the nonuniform stress distribution by embedding three dimensional strain rosettes into epoxy plugs and fitting them into a large epoxy model of the tibial component. The strain data caused by loading the model of the tibial component in compression was analysed and was compared with results from a finite element analysis on a similar model of the prosthesis.

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“…Consequently, any concerns with strain levels noted in this study will, therefore, warrant extra attention in line with the extent of this potential reinforcement. Strain gauges embedded in poor thermal conductors, such as plastic and bone cement, may encounter errors due to local heating of the surrounding material (16,19,22). These errors may be virtually eliminated with the use of a pulsed power supply for the gauges (20), such as was employed in this study (3).…”

Section: Strain Gauges: Reinforcement and Pressure Effectsmentioning

confidence: 99%

Deformation of the Cement Mantle of Tibial Components following Total Knee Arthroplasty: A Laboratory Study

Finlay

Hardie

Bourne

et al. 1991

Proc Inst Mech Eng H

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An in vitro model has been developed to measure in-plane strains of the cement mantle, sandwiched between the tibial component and the underlying cancellous bone following total knee arthroplasty. Maximal in-plane strains occurred in the cement mantle below the contact points between the femoral and tibial components. These strains were significantly reduced by increasing the thickness of the polyethylene and even more impressively by metal backing. Eccentric loading, by as little as 5 degrees, increased the strains in the loaded compartment by 26 per cent and decreased those in the unloaded compartment by 62 per cent. The addition of torsion to axial loading did not significantly alter the principal direct strains or the principal shear strains. Although surface-covering tibial components have been advocated, continuous support of the cortical rim did not appear to be important in reducing cement mantle strains. While other studies have emphasized the critical stresses that may occur in the polyethylene tibial components of total knee implants, this study highlights the potential for localized cement fatigue with improperly sized components or with eccentric loading.

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Effects of self heating when using a continuous bridge voltage for strain gauging epoxy models

Cited by 21 publications

References 7 publications

Embedded Strain Gauges: Effect of the Stress Normal to the Grid

Embedded Strain Gauges: Effect of the Stress Normal to the Grid

A Static Experimental Stress Analysis of a Single Plateau of the Geomedic® Knee Joint Using Embedded Strain Gauges

Deformation of the Cement Mantle of Tibial Components following Total Knee Arthroplasty: A Laboratory Study

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