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<p>Fracture mechanics-based multi-level computational modeling and simulation techniques were developed to  predict failure strengths of composite scarf joints under tension or compression. Global, local, and element level  models were used in the study in order to calculate the energy release rates at the scarf joints. The study showed that  explicit modeling of the resin layer at the scarf joint, where cracks initiate, was important for accurate prediction of  the joint failure strengths. In addition, the consideration of the joint interface slope in the fracture model was  important especially for compressive joint failure strengths. In terms of the mixed failure criteria for crack  propagation, the interactive biquadratic criterion was found to be useful for reliable prediction of joint failure  strengths. The predicted strengths were in good agreement with experimental data which were obtained for two  different kinds of polymer composites, e-glass/epoxy or carbon/epoxy.
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<br>Subjects: Tensile architecture; Shipbuilding</div>
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Greene, Todd R.</div>
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