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Current fracture mechanics methods for fatigue assessment of welded joints are based on long crack behavior.
A possible explanation for this discrepancy is proposed and a methodology to estimate the small crack behaviour based on long crack data is presented.
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The stress intensity factor range ΔKth threshold of long crack is estimated based on crack arrest condition for partial slip fretting and prestressed fretting loadings, coupling experimental and FEM computations.
With respect to crack growth models, most are based on a single crack driving force ΔK.
Afterwards, 3D mix-mode fatigue crack growth simulation was developed based on four initial crack assumptions.
A total life probabilistic model has been developed based on both short and long crack growth data to analyse the fatigue crack growth under general loading conditions.
The assessment was based on crack initiation only and hence complete dislocation was not investigated here.
The comparison in terms of fatigue limit between model and experimental full scale (FS) tests has shown an underestimation of the fatigue strength if the prediction based on ΔKth,LC values for long cracks is used.
Based on the results, the crack tip stain rates by crack advance and creep rates near crack tip were estimated.
The authors then develop closed-form equations useful for bonded composite repair design and damage tolerance assessment of cracks of arbitrary length by developing a new method for interpolation between this long-crack limit and a short-crack limit based on the stress intensity and crack face displacements for an unreinforced crack.
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