Hardness data was collected on the 21 tensile coupons from the Call Road Bridge before they went through destructive testing. The Rockwell B test was performed in accordance to ASTM E18-03. A 1/16 inch ball indenter was used with 100 kg of test force.
A total of 8 readings were taken on each specimen. The process for data collection was made uniform to increase precision. The location of the indentation for each reading is shown in Figure 1.

Figure 1. Hardness test locations.