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인장 굽힘피로를 받는 부재의 피로수명과 균열관통
Fatigue Life and Peneration Behaviour of Material under Combined Tension and Bending Stress

남기우    (부산수산대학교, 재료공학과  );
  • 초록

    The leak-before-break(LBB) design on the large structures such as ship's hull, tank structure, pressure vessels etc. is one of the most inportant subjects for the evaluation and the assurance of safety. In these structures, various loads are acting. In some structural members, therefore, out-of-plane stress due to bending often may become with in-plane stress due to stretching. In the present report, the characteristics of fatigue life and peneration behaviour from a surface cracked plate under combined tension and bending have been studied experimentally and analytically by using eccentricity. Estimation of fatigue crack growth was done with the Newman-Raju formula before penetration, and with the stress intensity factor after penetration proposed by the author. Calculated aspect ratio showed the good agreement with the experimental result. It was also found that particular crack growth behaviour and crack shape after penetration can be satisfactorily evaluated using the K solution proposed.


  • 주제어

    파단전누실 .   관통후 응력확대계수 평가법 .   편심량 .   표면균열 .   조합된 인장과 굽힘응력 .   Leak Before Break(LBB) .   Estimation Method of Stress Intensity Factor after Penetration .   Eccentricity .   Surface Crack .   Combined Tension and Bending Stress.  

  • 참고문헌 (11)

    1. An empirical stress intensity factor equation for the surface crack , J.C.Newman,Jr.;I.S.Raju , Eng. Fract. Mech. / v.15,pp.185-192,
    2. Code for the construction and equipment of ships carrying liquefied gases in bulk , IMO Resolution A 328(IX) / v.,pp.,
    3. The effect of specimen size on the behaviour of fatigue-crack-penetration , K.W.Nam;K.Ando;N.Ogura , Fatigue Fract. Eng. Mater. Struct. / v.16,pp.767-779,
    4. Effect of plate thickness on the bending stress distribution around through cracks , R.J.Hartranft;G.C.Sih , J. Math. Phys / v.47,pp.276-291,
    5. G.C.Sih , Mechanics of fracture / v.3,pp.25,
    6. Boiler and pressure vessel code. Sec. XI / v.,pp.,
    7. Further considerations on the development of surface cracks under stable crack extension , B.Ruttenauer;W.Setz;L.Grueter , Z. Werkstofftech / v.14,pp.41-44,
    8. Shape development of surface defects in tension fatigued finite thickness plates , M.D.Gilchrist;M.I.Chipalo;R.A.Smith , Int. J. Pres / v.49,pp.121-137,
    9. A preliminary study on surface crack growth in a combined tensile and bending fatigue process , M.Kawahara;M.Kurihara , Jap. Soc. of Nav. Archit / v.137,pp.297-306,
    10. 고장력강의 피로수명과 균열 관통 거동에 관한 연구 , 남기우 , 대한기계학회논문집 / v.15,pp.1991-2001,
         
    11. Leak-before-break conditions of plates and pipes under high fatigue stresses , K.W.Nam;K.Ando;Y.Sakai;N.Ogura , Fatigue Fract. Eng. Mater. Struct. / v.15,pp.809-824,
  • 이 논문을 인용한 문헌 (2)

    1. 1997. "Analysis on Deformation Behavior of Statically Indeterminate Beams" 한국어업기술학회지 = Journal of the Korean Society of Fisheries Technology, 33(1): 76~83     
    2. 2001. "Life Prediction of Fatigue Crack Propagation and Nondestructive Evaluation in 5083 Aluminum Alloy" 韓國海洋工學會誌 = Journal of ocean engineering and technology, 15(2): 94~98     

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