Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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An Experimental Study on the Growth Behavior of Multi-Surface-Cracks in Type 304 Stainless Steel at Elevated Temperature

고온하 304 스테인리스철의 표면규열의 성장거동에 관한 실험적 연구

  • 서창민 (경북대학교, 기계공학부) ;
  • 신형섭 (안동대학교 공대 기계공학과) ;
  • 황남성 (영남전문대학 기계과) ;
  • 정대윤 (영남전문대학 기계과)
  • Published : 1995.06.01
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Abstract

The crack which is discovered in various structures and machine elements is multi-cracks. Multi-cracks may cause serious problems because they grow individually, and coalesce into one and it leads to fracture. Fatigue tests have been carried out to study the growth and coalescence behavior of multi-surface-cracks initiated at the semicircular surface notch in type 304 stainless steel at elevated temperature. The results are as follows; When multi-surface-cracks are lying on the surface of material, the major surface crack has greater influence on the fatigue life than the subcracks. The aspect ratio of multi-surface-cracks is lower than that of single crack because of the interaction and coalescence of surface cracks. Crack growth shape turns to semiellipse from the semicircle notch. After coalescence, the surface crack length increases rapidly, and it leads to fracture. Further, the slope transition of Paris law was found in the da/dN-$\Delta$K$_1$ plots.

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References

  1. Metal Fatigue in Engineering Fuchs,H.O.;Stephens,R.I.
  2. 대한기계학회지 v.26 no.5 피로파괴와 파괴역학에 관하여 서창민
  3. ASTM STP 791 Geom-etry Variations during Fatigue Growth of Surface Flaws Jolley,M.;Tortoriello,V.
  4. Fatigue Fract. Engng. Mater. Struct. v.13-5 Fatigue Microcracks in type 304 Stainless Steel at Elevated Temperature Suh,C.M.;J.J.Lee;Y.G.Kang
  5. ASTM STP 486 The Significance of Fa - tigue Crack Closure Elber,W.
  6. Fatigue Fract. Engng. Mater. Struct. v.15-7 A Simulation of the Fatigue Crack Process in Type 304 Stainless Steel at 538 °C Suh,C.M.;J.J.Lee;Y.G.Kang;H.J.Ahn;B.C.Woo
  7. JHPI v.24 no.3 鋼構造物の波勞き 裂進展壽命評價 システム 吉田敏雄;結城良治
  8. Engng. Frac. Mech. v.16 Interacting Dissimilar Semi-Elliptical Surface Flaws under Tension and Bending Murakami,Y.;S.Nemat-Nasser
  9. 大韓機械學會論文集 v.18 no.3 複數 表面波勞균열의 成長 · 合體擧動과 시뮬레이션에 관한 硏究 徐昌敏;黃南性;朴明圭
  10. 材料 v.34 no.344 高溫にわけるステンレス鋼の表面き裂の波勞き裂成長特性, 結城良治;北天英夫;徐昌敏;持田郁夫
  11. ASTM STP 520 Fatigue Crack Growth Characteristics of Several Austenitic Stainless Steels at High Temperature Shahinian,P.;Smith,H.H.;Watson,H.E.
  12. J. of Pressure Vessel Technology v.101 Frequency Effects in the Elevated Temperature Crack Growth Behavior of Austenitic Stainless Steels - A Design Approach James,L.A.
  13. J. of Engineering Materials and Technology v.113 Fatigue Crack Growth Behavior of Alloy 800H at Elevated Temperature Hour,K.Y.;Stubbins,J.F.
  14. 韓國海洋工學會誌 v.1 no.1 2.25 Cr-1Mo鋼작은 表面균열의 成長에 관한 基礎的 硏究 徐昌敏;姜用求
  15. 大韓機械學會志論文集 v.11 no.2 작은 表面缺陷에서 發生,成長하는 表面波勞균열의 成長特性에 관한 硏究 徐昌敏;權五憲;李正州
  16. Stress Intensity Factors Handbook Murakami,Y.
  17. ASTM STP 791 Stress Intensity Factors Equation for Cracks in Three-Dimensional Finite Bodies Newman,J.C.,Jr;Raju,I.S.
  18. Trans. ASME, J. Basic Eng. v.85 A Critical Analysis of Crack Propagation Laws Paris,P.C.;F.Erdogan
  19. Advance in Fracture Research, Prints of the International Conference on Fracture(ICFS) v.4 Influence of Specimen Geometry on Dalayed Retardation Phenom ena of Fatigue Crack Growth in HT-80 Steel and A5083 Aluminum Alloy Tanaka,K.;Matsuoka,S.;Schmidt,V.;Kuna,M.
  20. 材料 v.33 no.368 發生初期徵小波勞き裂から彈塑性巨視波勞き裂までのき裂進展速度と開閉口擧動 城野政弘;宋智浩;岡部雅彦;江口直紀