Abstract
A new method for the integrated probabilistic analysis of damage tolerance and risk of failure that considers the effects of material property scatter and the load history effect on crack growth rates has been developed. The underlying damage tolerance analyses were conducted using a plasticity-induced crack closure model, with key inputs generated using the Monte Carlo method. The statistical behaviours of the following variables were modelled: the initial crack size, the peak stress of the load spectrum, the fracture toughness, the parameters defining the fatigue crack growth rate and the threshold stress intensity range. Each random variable was defined as either (i) a random variable with a normal, log-normal or Weibull distribution, or (ii) as a deterministic variable with a single specified value. Risk analyses were conducted on two structural elements to demonstrate the use of the new method. The results showed a lower probability of failure compared to those obtained using the master crack growth curve method. It is envisaged that by capturing the material property scatter and the history effects the proposed approach would provide an improved probabilistic risk assessment for aircraft structures.
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Hu, W., Torregosa, R.F. (2011). Integrated Probabilistic Analysis of Damage Tolerance and Risk for Airframe Structural Locations. In: Komorowski, J. (eds) ICAF 2011 Structural Integrity: Influence of Efficiency and Green Imperatives. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1664-3_49
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DOI: https://doi.org/10.1007/978-94-007-1664-3_49
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-1663-6
Online ISBN: 978-94-007-1664-3
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