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The influence of variations of geometrical parameters on the notching stress intensity factors of cylindrical shells

Moustabchir H., Hamdi Alaoui M. A., Babaoui A., Dearn K. D., Pruncu C. I., Azari Z.

Journal of Theoretical and Applied Mechanics

2017

Vol. 55 nr 2

559—569

The modern approach of Virtual Engineering allows one to detect with some accuracy the residual life of components especially free of cracks. The life estimation becomes cumbersome when the components contain a crack. A straightforward formulation requires a parameter that considers geometrical constraints and materials properties. The magnitude of the stress singularity developed by the tip of a crack, needs to be expressed by the Stress Intensity Factors (SIF). In order to prove the validity of the results, calibration by experimental and/or analytical technique is required. To have a better understanding of this parameter, in the first part of this paper an analytical model to compute the SIF connected to crack propagation into Mode I has been implemented. The case study displays a pipeline component with a crack defect submitted to internal pressure. Therefore, an appropriate correlation between the analytical approach and numerical simulation has been established embedded.

Optimisation of water distribution networks design by minimizing the total length

Lahiouel Y., Chaoui K., Khezzar L., Haddad A., Azari Z.

Engineering Transactions

2005

Vol. 53, iss. 2

165-183

The aim of the present work is to establish a new algorithm for the optimization of the design of water distribution networks. The proposed algorithm makes it possible to connect the nodes and the sources using the shortest path to obtain a final looped configuration. A novel method, the "minimal length algorithm", is proposed. It uses the advantages of existing methods and exceeds their limitations. Some of the well-known existing methods are the shortest path algorithm, the minimum spanning tree algorithm and a novel method published previously. The developed algorithm is implemented into a user-friendly interactive computer program which allows the design of looped systems with minimal length ensuring least cost, reliability of the network and hence the availability of water.