An Experimental Study for the Fatigue Strength Assessment of Longi-web Connections

Kang, Sung Won; Kim, Jeong Hwan; Kim, Kwang Seok; Kang, Joong Kyoo; Heo, Joo Ho; Kim, Myung‐Hyun

doi:10.3744/snak.2008.45.1.87

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Appropriate S-N curves corresponding to the joint type is used to estimate the fatigue life of the structure. The result of this approach, however, is known to be very sensitive to finite element type and mesh size in way of the weld toe due to a stress concentration [1]. The results also vary according to the type of the commercial finite element codes due to the different ways for interpolating or extrapolating the stresses from integration point.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Fatigue Evaluation for Weldments under Out-of Plane Bending Load Using Structural Stress and Hot Spot Stress

Kim

Kang

et al. 2006

KEM

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Fatigue strength assessments with two types of load carrying fillet weldment under out-of-plane bending load have been carried out by using both hot spot stress and structural stress methods. Basis for the derivation of structural stress method is discussed in detail. Finite element analyses using shell elements models have been performed for the fatigue strength assessment of weldments. As a result of the fatigue strength evaluation for load carrying transverse fillet weldment, hot spot stress method is found to be consistent with structural stress method as well as measurement. Hot spot stress, however, estimated for the load carrying longitudinal fillet weldment exhibit large variation with respect to mesh size and element type while the calculated structural stress for the longitudinal fillet weldment is relatively independent of mesh size. The fatigue life estimation according to structural stress has been introduced with the master S-N curve.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Fatigue Evaluation for Weldments under Out-of Plane Bending Load Using Structural Stress and Hot Spot Stress

Kim

Kang

et al. 2006

KEM

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Development of Evaluation System for Fatigue Strength on the Connection Between Longitudinals and Transverse Web

Hong¹,

Kim²,

Ahn³

et al. 2009

Journal of the Society of Naval Architects of Korea

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Ship structure is composed of the welded mixture members which are plate and stiffeners. Ship structure is also influenced by variable loadings such as wave and inertia load. There have been several fatigue damage problems on the connection between longitudinal and transverse web due to wide usage of high tensile steel and adoption of wide web space to improve shipbuilding productivity. It is impossible to estimate the fatigue lives for all connection details through refined fatigue analysis. It is necessary to use the simplified approach for the fatigue life estimation of the connection details. PLUS analysis, which is suggested by the classification society, is one of the simplified approaches and is widely adopted to get fatigue lives for the connection details along whole cargo hold area.However, ship building yards still have difficulties to get fatigue lives due to large amount of calculation and time even if this approach reduce the time and amount of calculation. This paper treats the computing system developed to reduce efforts of estimating the fatigue lives. The influence factors of mean shear stress and local dynamic pressure are easily calculated and fatigue lives for all hot spots can be estimated automatically by the developed computing system. It is possible to reduce computing time and efforts to get the fatigue lives for the connection details between longitudinals and transverse webs along the ship. This system was applied to get fatigue lives on the connection details of a VLCC and verified the availability.

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A Comparative Study of the Fatigue Strength on Cruciform Joints by Local Stress Methods

Yang

Ahn²

2010

Journal of the Society of Naval Architects of Korea

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The notch effects on the fatigue strength of welded joints are both stress concentration and fatigue strength reduction. In the notch stress approach, the notch effects are usually approximated by introducing weld-bead parameters for the local detailed weld joints. In this paper, well-known notch stress approaches -critical distance method, area method and fictitious rounding method are presented for the fatigue strength of cruciform joints. The estimated results of the present methods are applied to the experiments performed in this study and reported in the references. The results of the application show that the fatigue-life scatterness of the experimental data expressed in the nominal stress is significantly reduced by introducing the effective fatigue stress of the present study. ※Keywords: Notch stress analysis(노치응력해석), Fatigue effective notch stress(유효노치피로응 력), Fatigue strength of cruciform joints(십자형 용접 연결부 피로 강도)

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An Experimental Study for the Fatigue Strength Assessment of Longi-web Connections

Cited by 3 publications

References 2 publications

A Comparative Study on the Fatigue Evaluation for Weldments under Out-of Plane Bending Load Using Structural Stress and Hot Spot Stress

A Comparative Study on the Fatigue Evaluation for Weldments under Out-of Plane Bending Load Using Structural Stress and Hot Spot Stress

Development of Evaluation System for Fatigue Strength on the Connection Between Longitudinals and Transverse Web

A Comparative Study of the Fatigue Strength on Cruciform Joints by Local Stress Methods

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