Nimonic 80A Alaşımının Johnson-Cook Model Parametrelerinin Sonlu Elemanlar Yöntemiyle Doğrulanması

Nimonic 80A alaşımı, yüksek sürünme mukavemeti, oksidasyon direnci ve yüksek sıcaklıktaki korozyona karşı güçlü direnci nedeniyle tercih edilmektedir. Bu makale Nimonic 80A süperalaşımının malzeme yapısal denklemini (Johnson-Cook parameters) belirlemek için yazılmıştır. Literatürdeki farklı malzeme yapısal denklemlerinin (Zerille Armstrong, Bodner Partom, JohnsonCook) arasından Johnson-Cook modeli tercih edilmiştir. Denklem parametrelerinin belirlenmesi için 3 farklı tipte basma testleri uygulanmıştır. Bunların ilki oda sıcaklığında gerçekleşen yarı-statik basma testleridir. Bu testler 10-3, 10-2 ve 10-1 s-1 gerinim hızlarında gerçekleştirilmiştir. Dolayısıyla bütün testler için referans gerinim hızı 10-3 seçilmiştir. İkinci test olarak oda sıcaklığında Split -Hopkinson çekme cihazı kullanılarak yüksek gerinim hızlarında (370 ~ 954 s-1) basma testleri gerçekleşmiştir. Son olarak referans gerinim hızında (10^-3 s^-1) yüksek sıcaklıklarda (24 ~ 200 °C) basma testleri yapılmıştır. Testlerin birbiri ile uygun olduğu gözlemlenmiş olup, bu testlerden elde edilen veriler ile malzemeye ait Johnson-Cook parametreleri belirlenmiştir. Son olarak, sonlu elemanlar yöntemi vasıtasıyla gerçekleştirilen basma testi simülasyonları parametrelerin uygunluğunu onaylamak adına ANSYS Workbench yazılımında yapılmıştır. Bu sonuçlar ışığında, deneysel ve simülasyon sonuçları arasında %3.23 sapma elde edilmiştir. Bu sapma miktarı, Nimonic 80A alaşımına ait belirlenen Johnson-Cook model parametrelerinin doğruluğunu kanıtlamaktadır..

Confirmation of johnson-cook model parameters for nimonic 80A alloy by finite element method

Nimonic 80A superalloy is frequently used due to its high creep resistance, oxidation resistance and high resistance to hightemperature corrosion. On the other hand, due to compatibility of simulation of plastic deformation processes, Johnson-Cook modelis chosen among the materials models such as Zerille Armstrong, Bordner Partom, Steinberg-Guinan etc. In this study, primarily,quasi-static compression tests were performed for 10-3, 10-2 and 10-1 s-1 strain rates at room temperature. Secondly, dynamiccompression tests were secondly conducted at high strain rates ranging from 370 to 954 s-1 using the Split Hopkinson Pressure Bar(SHPB) apparatus. Then, the compression tests were conducted at a temperature level from 24~200 °C at the reference strain rate.Johnson-Cook model parameters of Nimonic 80A were determined by analyzing the data obtained from the tests. Lastly, thecompression simulations with finite element method (FEM) were performed in ANSYS Workbench to confirm the accuracy of theparameters. In the light of the results, it was determined that there is an average of %3.23 deviation between the experimental andthe simulation values. The result showed that accuracy of the Johnson-Cook parameters for Nimonic 80A superalloy was verifiedwith FEM.

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