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Crack growth characteristics of integrally machined stringer–skin panels

Published online by Cambridge University Press:  04 July 2016

J. B. Young  and
M. Ashfaq Sheikh
J. B. Young
Affiliation:
Department of Aerospace Technology College of Aeronautics, Cranfield University, Cranfield, UK
M. Ashfaq Sheikh
Affiliation:
Department of Aerospace Technology College of Aeronautics, Cranfield University, Cranfield, UK
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Summary

The variation of the stress intensity factor (SIF) for cracks growing in integrally machined stiffened skin panels have been studied in an isotropic material. The stringer-skin panel has been modelled using the Nastran finite element system with allowance for crack tip singularity by use of crack tip elements. To allow for variations in stringer and skin geometry, three stiffness ratios (stringer stiffness-skin stiffness) were investigated.

The stress intensity factors have been converted into nondimensionalised values of stress intensity factor coefficients (K1/K0). A damage tolerant and residual strength analysis has been carried out using an in-house computer program. Results indicate very little difference for the different stiffness ratios examined.

Type
Research Article
Information
The Aeronautical Journal , Volume 99 , Issue 982 , February 1995 , pp. 63 - 68
Copyright
Copyright © Royal Aeronautical Society 1995 

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References

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