Studi Eksperimen Pengaruh Temperatur Terhadap Batas Lelah (Fatiguelimit) Dan Pola Patahan Baja Poros Aisi 1045 Dengan Pengujian Lentur Putar (Rotating Bending)

Nuri, Rani Kartika (2009) Studi Eksperimen Pengaruh Temperatur Terhadap Batas Lelah (Fatiguelimit) Dan Pola Patahan Baja Poros Aisi 1045 Dengan Pengujian Lentur Putar (Rotating Bending). Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Pada peralatan industri seringkali menggunakan poros sebagai komponen utama untuk transfer daya. Salah satu faktor yang mendukung panjangnya umur pakai poros adalah kondisi temperatur kerja poros. Temperatur kerja poros mengalami kenaikan seiring dengan kenaikan putaran poros. Kenaikan temperatur tersebut tidak sampai merubah sifat mekanik material poros, namun mempengaruhi umur pakai poros dan ketahanan poros dalam menerima tegangan berulang. Dalam penelitian ini dilakukan pengujian kelelahan terhadap baja poros AISI 1045, dikondisikan pada dua temperatur ujiyaitu 30°C (suhu kamar) dan J50°C. Pengaturati temperatur dilakukati melalui oven pada alat uji lentur putar. Pengujian dilakukan pada tingkat tegangan yaitu 668.232 MPa (0.62ou), 556.86 MPa (0.52ou), 515.86 MPa (0.48ou), 455.46 MPa (0.4lou) dan 389.80 MPa (0.36ou), pada setiap tingkat tegangan diuji 3 buah spesimen uji. Fraktografi permukaan pola patahan (patah statik dan patah lelah) mengunakan metode visual, mikroskop optis dan SEM (Scanning Electron Microscope). Hasil yang didapat setelah material di uji lentur putar adalah didapatkan nilai batas lelah (fatigue limit) pada temperatur 30°C dan temperatur 150°C yang berada pada daerah tegangan sekitar 455.46 MPa (0.42ou). Foto makro patahan menunjukkan bahwa prosentase luas permukaan daerah patah statik (dengan beban yang soma) pada temperatur I50°C lebih besar dari temperatur 30°C, namun perbedaan tersebut tidak signifikan. Luas daerah patah lelah dan patah statik tergantung pada tingkat tegangan, semakin besar beban tegangan yang diberikan terhadap benda uji maka semakin kecil litas daerah perpatahan lelahnya. Penampang patahan pada temperatur 150°C memmjukkan patahan yang lebih ulet daripada temperatur 30°C
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Industrial equipment often uses shafts as the main component for power transfer. One of the factors that supports the long service life of a shaft is the working temperature conditions of the shaft. The working temperature of the shaft increases along with the increase in shaft rotation. The increase in temperature does not change the mechanical properties of the shaft material, but affects the lifetime of the shaft and the shaft's resistance to repeated stress. In this research, fatigue testing was carried out on AISI 1045 steel shafts, conditioned at two test temperatures, namely 30°C (room temperature) and J50°C. Temperature control is carried out via an oven on a rotary bending tester. Tests were carried out at stress levels, namely 668.232 MPa (0.62ou), 556.86 MPa (0.52ou), 515.86 MPa (0.48ou), 455.46 MPa (0.4ou) and 389.80 MPa (0.36ou), at each stress level 3 test specimens were tested. . Surface fractography of fracture patterns (static fracture and fatigue fracture) using visual methods, optical microscope and SEM (Scanning Electron Microscope). The results obtained after the material was subjected to a rotary bending test were that the fatigue limit value was obtained at a temperature of 30°C and a temperature of 150°C which was in the stress area of around 455.46. MPa (0.42ou). Macro photos of the fracture show that the percentage of surface area of the static fracture area (with soma load) at a temperature of I50°C is greater than at a temperature of 30°C, but the difference is not significant. The area of fatigue fracture and static fracture depends on the stress level, the greater the stress load applied to the test object, the smaller the area of fatigue fracture. The fracture cross section at a temperature of 150°C shows that the fracture is more ductile than at a temperature of 30°C.

Item Type:	Thesis (Other)
Additional Information:	RSM 620.112 6 Nur s-1 2009
Uncontrolled Keywords:	Fatigue, Fatigue limit, Temperatur, Lentur Putar, Umur lelah, Patah lelah, Patah statik; Fatigue, Fatigue Limit, Temperature, Rotating Bending, Fatigue Life, Fatigue Fracture, Static Fracture
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	EKO BUDI RAHARJO
Date Deposited:	26 Oct 2023 06:00
Last Modified:	26 Oct 2023 06:00
URI:	http://repository.its.ac.id/id/eprint/105001

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