High temperature (650 C) crack growth behavior of a nickel base superalloy with fine and coarse grains was studied under constant (mode I) loading. An effective driving force was found to control the crack growth rate of the fine grained specimen and threshold stress intensity factor was determined. The coarse grained specimen exhibited a higher fracture resistance than the fine grained specimen. Crack growth was found to be dependent on ...
Intralaminar shear properties of unidirectional carbon-fibre reinforced epoxy and PEEK composites were investigated using the Iosipescu shear test. The apparent shear strength and shear moduli were measured using specimens with two different fibre orientations. Finite element analysis was applied to determine the stress distribution within the Iosipescu specimen. Using numerical correction factors to account for the non-uniform shear stress distribution in the gauge-section of Iosipescu specimens, the actual shear moduli ...
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