The Al 6070 is the side plate material of the MTR-fuel plate bundle. These post-irradiation mechanical properties will be used in the side plate cutting process to obtain certain plates from the MTR-fuel plate bundle. This activity is part of a series of post-irradiation test processes from the MTR-fuel plate bundle in order to determine its performance. After testing in the form of a bundle (assembly), then continued testing of certain plates from the bundle. Disassembly of the plate is carried out by cutting along the two side plates (aluminum alloy) that clamp the plate. The mechanical properties of the workpiece material are important factors that affect the conditions of the machining (cutting) process. Prediction of post-irradiation mechanical properties was carried out using the change percentage of before and after irradiation of other aluminum alloys. The prediction carried out with the Si transmutation as the dominant one affects the post-irradiation mechanical properties changes in aluminum alloys. The change percentage added the mechanical properties of the pre-irradiated side plate material of the MTR-fuel plate bundle. Pre-irradiation testing of the Al 6070, namely chemical composition tests, pre-irradiation mechanical properties tests, including hardness tests (micro), and tensile tests (max stress, yield stress, and % elongation). Prediction of changes in mechanical properties of side plate material (aluminum alloy, Al 6070) before irradiation, compared to after irradiation is: hardness value from 98.51 to 127 (gf/µm2), tensile strength from 265.371 to 398 (N/mm2), the yield strength from 204.2 to 306 N/mm2.
KARAKTERISASI MATERIAL INSULASI KABEL LISTRIK TEGANGAN RENDAH DARI PRODUK LOKAL PASCA IRADIASI GAMMA. Penelitian ini ditujukan untuk mempelajari pengaruh radiasi gamma terhadap karakter polimer semi kristalin pada material insulasi kabel listrik tegangan rendah dari produk lokal, terkait penggunaannya di fasilitas dengan radiasi gamma tinggi. Sampel uji diiradiasi menggunakan perangkat Gamma Cell dengan dosis radiasi sebesar 25, 50, 100, 200, 400 dan 800 kGy. Derajat kristalinitas dan komposisi senyawa dari sampel uji dianalisis dengan uji XRD dan dikarakterisasi menggunakan FTIR. Berdasarkan uji XRD yang dilakukan, tidak teramati adanya perbedaan signifikan pada pola difraksi antara sampel uji non iradiasi maupun sampel uji iradiasi dengan variasi besar dosis. Hal ini mengindikasikan tidak terdapat perubahan fase mayor dari senyawa kristalin yang terkandung dalam sampel uji terkait. Adapun derajat kristalinitas dari sampel uji cenderung menurun seiring meningkatnya dosis radiasi yang diberikan. Hasil analisis FTIR menunjukkan adanya perbedaan transmittance yang fluktuatif antar sampel uji dengan dosis radiasi gamma yang berbeda juga dengan sampel uji non-iradiasi gamma. Adanya spektra yang semakin melebar di 400 kGy dan 800 kGy, pada wavenumber 3369 – 3370 cm-1, hal ini mengindikasikan adanya gugus O-H stretch. Pengujian lebih lanjut diperlukan untuk menguatkan identifikasi terhadap gugus fungsi, penentuan senyawa organik, maupun evaluasi terhadap karakter mekanik sampel uji yang sekaligus diperlukan untuk mengonfirmasi dugaan adanya gangguan terhadap asosiasi polimer-plasticizer.Kata kunci: Polimer semi kristalin, irradiasi gamma, derajat kristalinitas, perubahan kimia
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