ASSESSMENT OF FATIGUE STRENGTH OF CRUCIFORM WELDED JOINTS FAILING FROM WELD ROOTS UNDER OUT-OF-PLANE BENDING

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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Effect of Bending-Work on Fatigue Strength of Aluminum Alloy Plate under Out-of-Plane Bending

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.62.539 ◽

2013 ◽

Vol 62 (9) ◽

pp. 539-546 ◽

Cited By ~ 1

Author(s):

Kei OHKAWA ◽

Atsushi KUDO ◽

Takehiro ANDO ◽

Isao OHKAWA

Keyword(s):

Aluminum Alloy ◽

Fatigue Strength ◽

Alloy Plate ◽

Out Of Plane ◽

Aluminum Alloy Plate ◽

Plane Bending

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Fatigue Strength Evaluation of Load-Carrying Fillet Weldments under Out-of-Plane Bending Load Using Structural Stress Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.2069 ◽

2007 ◽

Vol 353-358 ◽

pp. 2069-2072

Author(s):

Myung Hyun Kim ◽

Sung Won Kang ◽

Chung In Ha ◽

Jae Myung Lee ◽

Jeong Hwan Kim ◽

...

Keyword(s):

Fatigue Strength ◽

Equilibrium Condition ◽

Solid Model ◽

Structural Method ◽

Structural Stress ◽

Strength Evaluation ◽

Bending Load ◽

Load Carrying ◽

Out Of Plane ◽

Plane Bending

Two types of load carrying fillet weldment, which are typical weld joints in ship structures, were examined under out-of-plane bending load by using structural stress approach. Finite element analyses using both solid and shell elements models have been performed for the assessment of fatigue strength. Basis for the derivation of structural stress method is discussed in detail. The calculated structural stress values for the fatigue strength evaluation of load carrying fillet weldments are independent of mesh size. In this study, drawbacks and doubts associated with applying the structural method such as the guidance of virtual node method and the application of three-dimensional equilibrium condition for solid model have been discussed accompanied by various case studies. In order to solve the problem of the solid model, the alternative method for solid model by using the equilibrium condition of the nodal force has been introduced.

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