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Implementation of a crack propagation constraint within a structural optimization software

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Abstract

A crack propagation constraint related to the stress intensity factor is examined for the minimum-weight design optimization of a composite blade-stiffened panel. A low-fidelity approach uses a closed-form solution for the stress intensity factor, while a high-fidelity approach uses the stress distribution around the crack. Structural optimizations are performed by low- and high-fidelity approaches for a number of panels configured with different values of the load, crack length, and blade height. Response surface (RS) approximations are then constructed for the optimal weight as a function of the three configuration variables. The computational cost, numerical noise, and accuracy for the two approaches are compared. An additional constraint in the low-fidelity solutions is found to be active for some of the configurations, increasing the difference between the low-fidelity and high-fidelity optima. It is shown that outlier analysis helps to identify the configurations with the largest difference.

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  1. Department of Mechanical and Aerospace Engineering, University of Florida, 32611–6250, Gainesville, Florida, USA

    M. Papila & R.T. Haftka

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  1. M. Papila
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  2. R.T. Haftka
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Correspondence to M. Papila.

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Papila, M., Haftka, R. Implementation of a crack propagation constraint within a structural optimization software. Struct Multidisc Optim 25, 327–338 (2003). https://doi.org/10.1007/s00158-003-0329-0

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  • DOI: https://doi.org/10.1007/s00158-003-0329-0

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