금속계 플럭스들이 용접이음부의 피로강도 특성에 관한 연구 = (A) Study on the Fartirue Strength Characteristics of the Welded Joint by Metall Type Cored Wire

다국어 초록 (Multilingual Abstract)

Flux Cored Arc Welding has a wide application in fabrication, maintenance and field erection of ship structure. It has many advantages over Shielded Metal Arc Welding, Submerged Arc Welding and Gas Metal Arc Welding process. In many applications, the Flux Cored Arc Welding provides a high-quality weld metal. This method can reduce weld defects such as porosity and spatter. However the fatigue strength characteristics of those deposited metal have been rarely investigated.
The purpose of this study is to investigate the cyclic stress-strain behavior and fatigue life of the deposited metal welded by the metal type flux cored wire. Completely reversed fatigue tests by the constant strain control were carried out on the rounded smooth specimen with deposited metal using the metal type flux cored wire. As the results of this study for the deposited metal welded by the metal type flux cored wire. the hardening or softening characteristics under cyclic load were investigated and cyclic stress-strain curve, strain-fatigue life curve, stress-strain function and fatigue life relation which are useful to estimate the fatigue life under the stress concentration condition were obtained.

목차 (Table of Contents)

• 목차
• 기호정의 및 약어 = 1
• 제1장 서론 = 2
• 제2장 시험편 = 4
• 2.1 이음재 제작 = 4
• 2.2 시험편 형상 및 치수 = 5
• 2.3 미세조직 검사 및 경도시험 = 5
• 제3장 피로시험 및 고찰 = 7
• 3.1 피로시험 방법 = 7
• 3.2 일정변형률제어에 의한 응력-변형률 특성 = 8
• 3.3 Δε-N_(f) 및 Δδ-Δε 곡선의 추정 = 9
• 3.4 응력변형률함수 D와 피로수명 N_(c) 곡선의 추정 = 11
• 3.5 K_(t)-ΔS-N_(c) 곡선의 추정 = 13
• 제4장 결론 = 14
• 참고문헌 = 15
• Abstract = 35