PSI - Issue 57

J. Baumgartner et al. / Procedia Structural Integrity 57 (2024) 618–624 J. Baumgartner et al. / Structural Integrity Procedia 00 (2023) 000–000

622

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Fig. 2. Assessment with stress-based approaches for constant amplitude loading

additionally the stresses parallel to the weld ∆ σ ∥ into account. ∆ σ ⊥ , S , d ∆ σ R , d 2 + ∆ τ S , d ∆ τ R , d 2 +

∆ σ ∥ , S , d ∆ σ ∥ , R , d

2

≤ CV

(3)

With this evaluation, more complex stress states can be evaluated and non-conservative assessments can be avoided in case of more complex stress states. Only for the evaluation with notch stresses care must be taken, to use nominal or structural stresses (acting ones and endurable ones) parallel to the weld. The assessment with fracture mechanics was updated to fit the structure of the assessment with linear-elastic stresses. Recommendations have been added, how the assessment of long load spectra (variable amplitudes) should be conducted.

2.7. Statistical considerations on safety

In the section for the statistical considerations on safety, formulae for the statistical assessment have been added and a new graph visualizing the assessment by comparing the probability of occurrence of stresses with the variation of the endurable stresses was added.

2.8. Chapter examples

In order to help the engineer to apply the IIW-recommendations correctly, an extensive set of examples was added:

• Fatigue strength assessment of a welded transverse sti ff ener under constant and variable amplitudes as well as under uni-axial and multi-axial stresses • Fracture mechanics assessment by M k solutions and with the weight function approach • Statistical evaluation of S-N data and verification of log-normal distribution • Estimation of K MAT from Charpy-V-notch data