A Comparative Study for the Fatigue Assessment of fillet Weldments Using Structural Stress and Hot Spot Stress

Chung-In, Ha; Kang, Sung-Myung; Kim, Man-Soo; Sohn, Sang-Yong; Heo, Jun-Ho; Kim, Myung‐Hyun

doi:10.3744/snak.2006.43.4.476

Journal of the Society of Naval Architects of Korea

2006

DOI: 10.3744/snak.2006.43.4.476

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A Comparative Study for the Fatigue Assessment of fillet Weldments Using Structural Stress and Hot Spot Stress

Ha Chung-In¹,

Sung-Myung Kang²,

Man-Soo Kim³

et al.

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The Application of Structural Stress Method for the Fatigue Strength Assessment of Longi-web Connections

Kim¹,

Kim

Kim³

et al. 2008

Journal of the Society of Naval Architects of Korea

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Recently, a mesh-size insensitive structural stress definition that provides a stress state at weld toe with relatively larger mesh size compared to conventional approaches has been proposed. The structural stress definition is based on the elementary structural mechanics theory and provides an effective measure of a stress state in front of weld toe.In this study, as an experimental validation of structural stress method in obtaining the fatigue strength of weldments, a series of fatigue test has carried out for longi-web connections, which are representative of ship-like structures. Based on the result from this study, it is expected to develop a more precise fatigue strength evaluation technique and to reduce time and cost associated with the fatigue design of ship and offshore structures.

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The Application of Structural Stress Method for the Fatigue Strength Assessment of Longi-web Connections

Kim¹,

Kim

Kim³

et al. 2008

Journal of the Society of Naval Architects of Korea

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

Kang¹,

Kim

Kim³

et al. 2008

Journal of the Society of Naval Architects of Korea

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In the load-carrying fillet weldments, which are common in ship structures, fatigue cracks can occur at the weld root, in addition to the weld toe. In particular, fatigue cracks originating from the weld root are difficult to detect and cause a significant reduction in the fatigue strength of a weldment. Therefore, it is important to note the fatigue failure mode of load-carrying fillet weldment. In this study, a series of fatigue test was carried out for the fatigue strength evaluation of longi-web connections that are typical kinds of the load-carrying fillet weldment.

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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 for the Fatigue Assessment of fillet Weldments Using Structural Stress and Hot Spot Stress

Cited by 3 publications

References 0 publications

The Application of Structural Stress Method for the Fatigue Strength Assessment of Longi-web Connections

The Application of Structural Stress Method for the Fatigue Strength Assessment of Longi-web Connections

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

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

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