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Interpretation of Overload Effects Under Spectrum Loading of Welded High-Strength Steel Joints

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Abstract

Within the structural durability evaluation of welded structures under spectrum loading, the influence of overloads on the fatigue life due to special events during service must also be considered. For this, butt welds and transverse stiffeners manufactured from the steel grades S355N/M, 690Q and 960Q were submitted to Gaussian spectra without and with superimposed overload spectra. The overloads harmed only the low-strength joints under pulsating bending. In all the other cases investigated, with low-, medium- and high-strength steels under fully reversed and pulsating loadings, a significant decrease of fatigue life was not observed; on the contrary, a significant increase of fatigue life could even be observed. This behaviour is explained by modelling the notch stresses and strains in the weld toes with the appertaining cyclic elastic-plastic material law and considering the local residual stresses. The modelling comprised also the crack propagation behaviour. Not only the fatigue life to crack initiation but also the crack propagation life is increased by the overload spectra.

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Abbreviations

a :

Amplitude, crack depth

c inital :

Surface crack length

D :

Damage sum

e :

Elongation

eq :

Equivalent

F :

Load

f :

Frequency, failure

G :

Gauss

K :

Stress intensity

k, k’:

Slope of the S-N line (curve), slope of the prolongation

l :

Longitudinal

L s , L so :

Sequence length, overload sequence length

k M :

Mean-stress sensitivity

M k :

Correction function for considering stress concentration

m :

Mean, exponent of Paris-Erdogan equation

N, N̄ :

Number of cycles, constant and variable amplitude loading

N k :

Fatigue life at knee point

n :

Nominal

OL:

Overload

P s :

Probability of survival

R,R̄ :

Load or stress ratio, R = F min /F max or σ min /σ max for constant and variable amplitude loading

r :

Rupture, radius

T σ, T̄ σ :

Fatigue strength scatter between P s = 10 and 90 %, for constant and variable amplitude loading

t, s :

Thickness

Y :

Correction function for crack propagation

Δ:

Range

ε:

Strain

σ, σ̄:

Stress, constant and variable amplitude loading

σak :

Knee point of the S-N line

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Authors and Affiliations

  1. Fraunhofer Institute for Structural Durability and System Reliability LBF, Darmstadt, Germany

    Cetin Morris Sonsino,  Heinz Kau Fmann,  Rainer Wagener,  Christian Fischer &  Jens Eufinger

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  1. Cetin Morris Sonsino
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  2. Heinz Kau Fmann
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  3. Rainer Wagener
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  4. Christian Fischer
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  5. Jens Eufinger
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Sonsino, C.M., Kau Fmann, H., Wagener, R. et al. Interpretation of Overload Effects Under Spectrum Loading of Welded High-Strength Steel Joints. Weld World 55, 66–78 (2011). https://doi.org/10.1007/BF03321544

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