Biomechanical Measurement Error Can Be Caused by Fujifilm Thickness: A Theoretical, Experimental, and Computational Analysis

Figure 6

Contact width results. (a) MOM indentation, (b) MOP indentation, and (c) MOB indentation. is true contact width determined by Hertzian theory without Fujifilm (dashed lines, - - -). is measured contact width determined experimentally with Fujifilm, such that data (blue square, red circle) were fitted with power law lines-of-best-fit (solid lines, —) which yielded high coefficients of determination (). Standard deviations for experiments are not shown to avoid graph clutter, but they averaged 9.3% (MOM), 3.4% (MOP), and 7.9% (MOB) of the mean, indicating highly reproducible results. By definition, a cylinder with a 0 mm diameter would create contact widths and of 0 mm. FE analysis was done to double-check the accuracy of Hertzian theory and experiments at 750 N for a 50.8 mm diameter cylinder, yielding excellent agreement for test cases with (green triangle) and test cases without (green downward triangle) Fujifilm.

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