Title Page
Contents
논문개요 7
Abstract 8
1. Introduction 9
2. Experimental Apparatus and Procedure 11
2.1. Test Materials and Specimens 11
2.2. Welding procedure 12
2.3. Fatigue Tests. 14
3. Analysis of Fatigue Failures in Welded Zone 19
4. Results and Discussions 22
5. Conclusion 25
References 30
Table. I. Chemical Composition of Specimen 13
Table. II. Mechanical Properties of Materials 13
Fig. 1. Plate Bending Fatigue Specimen 16
Fig. 2. Joint Geometry of Butt Welded Specimen 16
Fig. 3. Universal Fatigue Testing Machine 17
Fig. 4. Bending Fatigue Test Fixture with Hounted Specimen. 17
Fig. 5. Schematic Diagram of Load Principle 18
Fig. 6. Fracture surfaces and Fatigue Cracks initiated at Several Different Points 26
Fig. 7. Microscopic Structure of Welded Specimen, 400 x 27
Fig. 8. Hardness Distribution of Welded Specimen of SS41 and SB42 28
Fig. 9. S-N Curves of As-Rolled Plate and Butt-Welded Specimen of SS41 and SB42 29