ABSTRACT
We used two processes to interpolate data. Initially, we visually interpolated values from the indentation tables. This is reasonably precise as the points taken during the indentation experiment are very closely spaced. However, this is a very time consuming process. In order to reduce the effort and improve the accuracy of the interpolation, a ninth-order polynomial was used to fit the load/indentation depth data. Two different polynomials were needed. One polynomial giving the load as a function of indentation depth was used to calculate the loads at specific indentation depths. The second gave the indentation depth as a function of the load and was used to calculate the indentation depths at specific loads. The data can then be presented as a table of triads of load/indentation depth/distance from the interface which can be presented in three dimensions or as plots of load at a fixed indentation depth as a function of distance from the interface or as indentation depths at a fixed load as a function of distance from the interface. Figure 4 shows
