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

1424. The Charpy impact energy of the wrought iron was found to be lower than mostcommon structural steels. This was especially true for the transverse specimensthat had maximum impact energy of 3 ft lbs for a wide range of temperatures.5. There was little difference in the tensile strength, yield strength, and percentelongation of the heat straightened tensile coupon specimens compared to thenon-repaired specimens.6. The mechanically straightened specimen had a lower percent elongation andtensile strength than the non-straightened specimens. This was because whenstraightening the bar, the cold metal is forced past the yield stress until permanentdeformations and residual stresses are induced. These permanent deformationsremove some of the ductility available in the material, thus making it less ductile.7. The welded tensile coupons had tensile strength and yield strength valuescomparable to the non repaired coupons. Also, none of the welded couponsfractured in the vicinity of the weld. A macrograph of selected test welds showedthat full penetration of the weld was acquired using the welding proceduredeveloped herein. Therefore, it is concluded that development of a suitable weldprocedure can be used to successfully implement the repair of wrought irontension members in an existing bridge structure.8. All of the eyebar end connections failed in the shank of the eyebar during the fullconnection test in tension. Large stress concentrations were found to exist at theedge of the pin hole. These stress concentrations could lead to fatigue cracking ifan eyebar is loaded and unloaded frequently. Therefore, the eyebar connectionsshould be inspected for any severe cracking in this area and then repairedadequately.