This study source was downloaded by 100000826450926 from CourseHero com on 01 04 2022 11 58 45 GMT 06 00 https www coursehero com file 8842345 Charpy Lab Write Up AbstractThe Charpy test is an impact test designated to measure the impact energy of different materials The Charpy test is often used because it is very easy and cheap to conduct Different material shave different impact energy based on DBTT composition and ductility Ductile materials tend to have a higher impact energy than brittle materials However when materials are placed in different conditions the materials respond differently in a Charpy test IntroductionOften an impact test is used to test the brittleness of a material 1 An example of this kind of test is the Charpy test The Charpy test was invented by Monsieur G Charpy and has been widely standardized by the several international organizations including the ASTM 2 The Charpy test is used to measure the impact energy of certain materials In the Charpy test a heavy pendulum is positioned at a certain height The sample is placed in a chamber below the pendulum within the pendulum s swinging arc The pendulum is swung and breaks the sample Fig 1 resulting in certain impact energy 1 Another term associated with the Charpy test is impact toughness which is the ability of the material to withstand the impact of the pendulum during a Charpy test 1 Many choose to use the Charpy test because the test is very easy and inexpensive to conduct However there are many factors that could affect the results of the Charpy test Some of those include the temperature the condition of the material composition ductility and other factors Some of these factors can increase and decrease the impact energy from the Charpy test ProcedureFor this procedure around 7 8 Charpy samples of three plain carbon steels 1018 1045 and 1095 polyvinyl stainless steel 304 and an aluminum alloy 6061 T651 were used Approximately 3 4 of the plain carbon steels were used to be normalized For the 1018 Charpy samples the samples were normalized at 915 C and then placed in a stainless steel bag The 1045 and 1095 samples were done together and normalized at 860 C Those samples were also placed into the stainless steel bag and then placed in a furnace The furnace was returned to temperature and held for an hour The samples were removed from the furnace and allowed to air cool After cooling the samples were separated and ready for testing Before testing one of each material normalized and cold finished was placed in different environments The temperatures of those environments were 250 C 100 C 22 C 0 C and 196 C The materials were left in each environment until the material required the same temperature of the environment The samples were transferred from their specific temperature environment into the Charpy tester within 5 seconds from the ASTM standards for testing Results This study source was downloaded by 100000826450926 from CourseHero com on 01 04 2022 11 58 45 GMT 06 00 https www coursehero com file 8842345 Charpy Lab Write Up Table 1 is a summary of the materials in the different conditions and the results from the Charpy test in each condition The 1018 material showed similar properties in the lower temperatures in how the material broke However the material changed from brittle to ductile in the cold finished sample around 100 C Fig 2 shows how the impact energy changed in how the material The impact energy was higher in the normalized sample than the cold finished sample Fig 3 compares the data for the 1045 sample In contrast the 1045 sample was opposite of the 1018 sample The cold finished sample had higher impact energy than the normalized sample Fig 4 compares the 1095 cold finished and normalized sample This data did not have a normal comparison with one set of data being higher than the others The data intertwine at a certain point and the graph switch positions Originally the normalized sample had the higher impact energy and then later in the graph the cold finished sample had the higher impact energy Fig 5 shows how the compositions of different samples affect the impact energy Stainless steel had the overall highest impact energy followed by the aluminum alloy and the polyvinyl chloride being last This study source was downloaded by 100000826450926 from CourseHero com on 01 04 2022 11 58 45 GMT 06 00 https www coursehero com file 8842345 Charpy Lab Write Up Table 1 Summary results of the Charpy test MaterialTemperature C Impact Energy J Quantitative1018 CF 1963 1As the temperature increased the material became more ductile The samples placed in the 100 C and 250 C environments formed sheer lips The samples in lower temperature had very clean breaks making them brittle 07 82224 710084 525093 21018 N 1962This sample was hard to distinguish whether or not it was ductile or brittle The two samples placed in the higher temperatures did not completely break The samples at the temperatures lower than 100 C did not do a clean break but did break with a somewhat flat surface so those materials were brittle 015022601001502501501045 CF 1962 1The material broke in half The material appeared to be brittle break was a clean break for most of the samples except for one The sample placed in the 250 C became ductile because the sample formed sheer lips instead of the clean break like the other samples 05 92211 710015 125018 41045 N 1962 6The sample placed in the 196 C environment became ductile This sample did not have a clean break and formed sheer lips the other samples were very brittle and had very clean breaks 043 22252 710088 325090 31095 CF 1961 4This material was very brittle Each sample had a clean break 08 3227 11007 525028 21095 N 1961 2This material was very brittle throughout Each sample had clean breaks 03 2223 610013 825028 16061 Al 19633 9Aluminum is a very ductile material None of the samples had a clean break and some of the samples formed sheer lips 034 62239 710035 2304 SS 19699Overall this material was very ductile Each sample had sheer lips None of the samples had a clean break as seen with the brittle materials 010022105 2100102 2PVC 1963 3This material was different from the others The sample in the 196 C did break but the other half of the sample completely shattered However the sample in the 100 C did not break 04 322410012 2Figure 2 shows the difference in the impact energy between the cold finished and normalized 1018 sample This study source was downloaded by 100000826450926