Rumford is a town in Oxford County, Maine, United States. The population was 6,472 at the 2000 census. Rumford is home to both an important paper industry and the Black Mountain of Maine ski resort. Originally called New Pennacook Plantation, the township was granted in 1779 to Timothy Walker, Jr. and associates of Concord, New Hampshire.
The charpy test, izod test and other impact testing determines material toughness or impact strength in the presence of a flaw or notch and fast loading conditions. This destructive test involves fracturing a notched specimen and measuring the amount of energy absorbed by the material during fracture.
Current practice in the United States divides hardness testing into two cat-. egories: macrohardness and microhardness. Macrohardness refers to testing. with applied loads on the indenter of more than 1 kg and covers, for exam-. ple, the testing of tools, dies, and sheet material in the heavier gages. In. microhardness testing, applied loads are 1 kg and below, and material being. tested is very thin (down to 0.0125 mm, or 0.0005 in.).