Chandra, Hendri and Nukman, Nukman and Sianturi, Baodadi (2019) Similarity of Analysis of Fatigue Life and Crack Propagation characterization of Gray Cast Iron Under Normalizing Process. Ithenticate Universitas sriwijaya, UNSRI. (Submitted)
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Abstract
Fatigue is a phenomenon of material damage due to repeated loading, it is known that when a metal is subjected to repetitive stress the metal will fracture at a much lower stress than the stress required on static load. This study discussed the effect of normalizing process on the fatigue resistance of gray cast iron material, by comparing the value of S-N curve between material which without heat treatment and under normalizing process. On The normalizing process specimens were preheated at 400°C for 10 minutes, then heated to 910°C for 60 minutes and 90 minutes respectively, then cooled in the opened air. Fatigue testing was performed using repeated torsion fatigue testing machine. The fatigue fracture surface of the test were observed by using scanning electron microscope (SEM) to identify crack propagation characteristics. The Inspection results showed that specimen with 60 minutes normalizing process has the highest cycle of 15600 cycles, 12200 cycles without normalizing, and 9850 cycles with normalizing 90 minutes. SEM inspection results also showed that the beginning of the crack initiate from the graphite structure of cast iron, this is becaused by the structure of the graphite are sharp at the tip. So that the stress concentration occured at the tip of graphite. This condition promoted the initiation of crack and than propagated until fracture.
| Item Type: | Other |
|---|---|
| Subjects: | #3 Repository of Lecturer Academic Credit Systems (TPAK) > Results of Ithenticate Plagiarism and Similarity Checker |
| Divisions: | 03-Faculty of Engineering > 21201-Mechanical Engineering (S1) |
| Depositing User: | Dr. Ir. Hendri Chandra |
| Date Deposited: | 15 Feb 2023 12:50 |
| Last Modified: | 15 Feb 2023 12:50 |
| URI: | http://repository.unsri.ac.id/id/eprint/89594 |
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