Figure 20.
The image presents two graphs labeled (a) and (b) that investigate the relationship between hardness measured in B H N (Brinell Hardness Number) and two variables: platelet size and platelet gap. Graph (a) depicts the hardness values on the vertical axis, increasing from thirty-eight to fifty, against platelet sizes in millimetres on the horizontal axis, ranging from ten to thirty. Data points indicate a positive correlation between hardness and platelet size. Graph (b) presents platelet gap on the horizontal axis, ranging from two to six millimetres, and also displays hardness elevation on the vertical axis. The data points indicate a negative correlation between hardness and platelet gap. Both graphs clearly show the plotted points and connecting lines, with a box indicating the hardness legend in the upper right corner of each graph.(Left) Barcol hardness value of platelet size varied 10–30 mm; (right) platelet gap 2–6 mm