TIME-VARIANT ASSESSMENT FOR ADHESIVELY- BONDED ASSEMBLIES WITH NON LINEAR BEHAVIOUR IN NAVAL APPLICATIONS

Abstract eng:
A mechanical structure responds to loading in a manner which corresponds to the behaviour of material, to the load variations and to the effect of the assembling process. Recently, adhesively bonding becomes a wide used assembling process, it can allow a great productivity, simple design constraints and significant weight gain. Unfortunately, this technology is not completely mastered. Moreover, as naval field is concerned, this process presents some specificity. In fact, parameters like cure process, size of defects, joint adhesive thickness variations, size of parts to be assembled and non linear behaviour of the adhesive joint, are to be taken into account to assess the risks and to predict the service life. Under this assumption, time-independent reliability is insufficient to allow a pertinent related failure probability calculation. The solution of such problem can be given by the use the time dependent reliability tools. This passes through coupling structural reliability software evaluation with a non linear finite element code. This choice requires robust mechanical models. This study presents a time variant reliability approach based on the PHI2 method. In order to limit the numerical cost of simulations, cohesive-zone models are used. This choice allows to model damage at the interface and is well suited for bonded joints as the possible degradation zone is well defined. Different numerical results showing the feasibility of this approach for adhesively-bonded assemblies are presented. Moreover, results are presented in the case of a representative part of naval structure.

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