PROBLEMS _CH8_ 8.12, 8.20, 8.33 ASSIGNMENT CHAPTER 8 8.12 Following is tabulated data that were gathered from a series of Charpy impact tests on a ductile cast iron. Temperature (°C) Impact Energy (J) –25 124 123 –50 115 –75 100 –85 –100 73 52 –110 26 –125 9 –150 –175 6 (a) Plot the data as impact energy versus temperature. (b) Determine a ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies. (c) Determine a ductile-to-brittle transition temperature as that temperature at which the impact energy is 80 J. Solution (a) The plot of impact energy versus temperature is shown below. (b) The average of the maximum and minimum impact energies from the data is As indicated on the plot by the one set of dashed the ductile-to-brittle transition temperature according to this criterion is about –105C. (c) Also, as noted on the plot by the other set of dashed lines, the ductile-to-brittle transition temperature for an impact energy of 80 J is about –95C.
PROBLEMS _CH8_ 8.12, 8.20, 8.33 ASSIGNMENT CHAPTER 8 8.12 Following is tabulated data that were gathered from a series of Charpy impact tests on a ductile cast iron. Temperature (°C) Impact Energy (J) –25 124 –50 123 –75 115 –85 100 –100 73 –110 52 –125 26 –150 9 –175 6 (a) Plot the data as impact energy versus temperature. (b) Determine a ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies. (c) Determine a ductile-to-brittle transition temperature as that temperature at which the impact energy is 80 J. Solution (a) The plot of impact energy versus temperature is shown below. (b) The average of the maximum and minimum impact energies from the data is As indicated on the plot by the one set of dashed the ductile-to-brittle transition temperature according to this criterion is about –105C. (c) Also, as noted on the plot by the other set of dashed lines, the ductile-to-brittle transition temperature for an impact energy of 80 J is about –95C.
SOLUTION_ASSIGNMENT_CH8.docx