Evaluation and Repair of Wrought Iron and - Purdue e-Pubs ...

40Two. These samples were taken from areas on the eyebars that had not been heat treatedor visibly damaged, and were approximately a half inch square in size. These sampleswere then sent to a commercial testing laboratory (Sherry Laboratories in Muncie, IN)which determined the chemical composition of the material. The laboratory thenreturned a listing of the elements found in the wrought iron. The quantity of eachelement was determined by finding the percent by weight for each element.3.4 Hardness TestingPieces from Eyebars One, Two and Three of the Bell Ford Bridge were used forhardness testing. The Rockwell B hardness test (ASTM 370) was performed on thesepieces. This procedure utilized a hardness testing machine and a 1/16 inch diameter ballto determine the hardness values of the metal. A calibration disk was used to check theresults provided by the hardness machine. Hardness values were found at multiplelocations of the specimens and then recorded with reference to their location. Figure 3.6is a drawing of the hardness values determined from this testing for one piece of wroughtiron.3.5 Tensile Coupon Testing3.5.1 Specimens Used in Tensile Coupon TestingTensile testing coupons were machined from all five eyebars of the Bell FordBridge. Eyebars 1, 2 and 3 were visibly damaged in the collapse of the bridge and hadbeen heat straightened or mechanically straightened. Tensile testing coupons from theheat straightened areas, and mechanically straightened areas were machined from theseeyebars along with non-repaired tensile testing coupons. Eyebar 4 had not experienced