engleski

Crack Growth Analysis in Critical Structural Components

Supervising and health monitoring of structures is a new field that has been of increasing importance with regard to control durability, stability and safety as well as to estimate the life span of the structure. Crack growth is interesting to be studied for the proper evaluation of the reliability of structural parts. Different methods are used to record the actual situation in order to get reliable information about the on-site structure and structural elements. The experimental techniques in fracture mechanics are employed for determining the stress intensity factors (SIFs) of the cracks in deformed structures. A procedure for simulation of crack propagation for multiple cracks was introduced and SIFs have been calculated by using finite element method. Crack growth of a single crack or a periodical array of cracks initiated at the stiffeners in a stiffened panel has been investigated. The optical method of caustics is established for the application to mechanically isotropic materials through the process of SIF’ s evaluation and is advantageously improved for the application to fiber-reinforced composites. Using high-speed photography and optical interferometric methods, it is analyzed the phenomena of dynamic failure process in composites and high-speed delamination. Valuable information gathered by the analysis of critical structural components should be important for making decision about the structural repairing or stopping the plant production. Significant examples are the analysis of structures of a deck of a ship structure, jacket of the gas and oil platform and the aeolian vibrations in electrical transmission line that can caused severe damage or even breakdown of the conductor due to material fatigue.

caustics; CGS interferometry; risk assessment; FEM model; survey; aeolian vibrations

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