Pengaruh Beban Lebih Majemuk Terhadap Laju Perambatan Retak Fatik Baja Tahan Karat Aisi 304
| Main Author: | Perpustakaan UGM, i-lib |
|---|---|
| Format: | Article NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Department of Chemistry Gadjah Mada University
, 2000
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/20358/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=3206 |
Daftar Isi:
- The aim of this research is to investigate the effect of multi overloads on crack growth rate in AISI 304 stainless steel. The type of center cracked specimens was used in which the initial crack was introduced by EDM. The specimens were tested dynamically using MTS. The test was set up as follows: R=0.3, stress level =30%, and overload ratio (OLR)=2. The mode of loading was sinusoidal with frequency of about 30 Hz. The mode of multi overloads was designed in two models. Firstly, the new overload was applied when the crack growth has exceeded the plastic zone as an effect of the former overload. Secondly, the new overload was applied when the crack has grown, but it was still inside the plastic zone developed the former overload. In general, the results show that multi overloads strongly affect in resisting the crack growth rate. The first model of overload can decrease the crack growth rate, and the crack growth is back to a normal condition after the crack exceeds the plastic zone. Similarly, the second model of overload can also decrease the crack growth rate, even a negative acceleration of crack growth has occurred. However, the first model gives higher number of cycle compared to the second model. SEM analysis shows that before the overload is applied, the crack growth rate of AISI 304 stainless steel tends to failure in brittle manner. In contrast, dimple fracture is shown after the overload is applied. Key word: Overload, Plastic zone, Crack growth rate