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

51Depending upon the desired temperature different liquid and ice combinations were used.To achieve a constant temperature of forty degrees Fahrenheit, for example, acombination of ice and water was used. To achieve constant temperatures of ten degreesFahrenheit or below, a combination of dry ice, water and alcohol was used.Once the liquid cooling bath used for cooling the Charpy V-notch specimensreached the desired temperature, the specimens remained suspended in the bath for aminimum of five minutes. Then they where transferred to the anvil of the impact testingmachine and the weighted lever arm and was released and the specimen broken. As perASTM E23, this step was to be completed in 5 seconds or less to ensure the temperatureof the sample did not increase notably. A dial on the impact testing machine read theimpact energy needed to break the specimen.The data acquired from performing this test consisted of the temperature of thespecimen and the correlating impact energy. Also, the characteristics of the fractureplane on the Charpy V-notch samples were noted.3.5 Eyebar Connection TestingThe eyebars that were received from the Bell Ford Bridge were composed of amiddle or “shank” section and one or two end connections – see Figure 3.2 and Figure3.3. These end connections consist of one large hole in a wider and thicker cross section,where the eyebar would be attached to the bridge using a large pin. The diameter of theholes in these connections were 2 ¼ inch. The material around the hole was wider thanthe shank to decrease the possibility of failure in the connection and not the shank. Tomore fully understand the behavior of these connections a finite element analysis andexperimental evaluation of the eyebar connection was completed.