Effect of crack arrester on fatigue crack growth in foam core sandwich panel under mode I type loading
Source abstract
Abstract
Abstract Crack arresters were installed to suppress interfacial crack propagation between the skin and core of CFRP/foam core sandwich panels. The effect of the crack arrester on suppressing the propagation of a fatigue crack was investigated under mode I type loading using double cantilever beam specimens. Specimens were made from carbon/epoxy fabric prepreg and a polymethacrylimide foam core. The energy release rate, calculated by FE analysis, showed a considerable reduction at the crack tip as the tip approached the crack arrester. Fatigue crack propagation tests were carried out using sandwich panel specimens containing the crack arrester. The crack propagation rate, da/dN, decreased with decreasing distance from the crack tip to the arrester edge. Thus, the suppression effect of the crack arrester was demonstrated experimentally. This suppression effect correlated strongly with the decrease in the energy release rate due to the crack arrester when the thermal residual stress was taken into account.
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Research context
OpenAlex topics: Mechanical Behavior of Composites · Cellular and Composite Structures · Fatigue and fracture mechanics
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References (31)
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