Thesis On Fracture Mechanics

Thesis On Fracture Mechanics-17
The fracture energy of the concrete was found to be independent of strength above a limiting value of 60  5 MPa.However, the fracture energy of the concrete was dependent on λ, the maximum value of fracture energy becoming limited by the strength of the aggregate particles.Three different aggregate gradings have been carried out to investigate the effect of the aggregate size distribution on fracture energy of concrete.

The fracture energy of the concrete was found to be independent of strength above a limiting value of 60  5 MPa.However, the fracture energy of the concrete was dependent on λ, the maximum value of fracture energy becoming limited by the strength of the aggregate particles.Three different aggregate gradings have been carried out to investigate the effect of the aggregate size distribution on fracture energy of concrete.

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The derived and existing models were then employed as the input fracture parameter for a finite element (FE) model to predict the behaviour of both normal and high reinforced concrete (RC) beams.

The results of six RC beams manufactured of concrete with an average compressive strength of 40 MPa and of 95 MPa were used to validate the FE results.

A statistical comparison between introduced models and available models was conducted.

The developed model demonstrated a better prediction when compared to available models although some variability was present.

The critical stress intensity (KIC) of the concrete was found to be almost independent of λ.

As λ shows a significant effect on fracture energy of concrete, a predicted fracture energy model was introduced.

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