Abstract：An experiment was conducted for the composite hat-stiffened panels with different forming process types with boundary constraint, in order to study the effect of secondary bonding and co-curing on the compression stability and carrying capacity of composite hat-stiffened panels, while the thickness of skin and polymethacrylimide (PMI) foam were taken into account on the effect on axial compression characteristics. In the test, strain gage was pasted to monitor the local bucking, acoustic emission was detected and fracture section was observed to investigate the fracture mechanism. The results show that the thickness of skin has significant influence on the compression properties of panels, PMI foam can slightly increase the buckling load while has no impact on the ultimate load. Both buckling load and ultimate load of co-cured panels almost decrease by 18% compared with that of secondary bonded panels, damage can be observed in the former prior to the latter, delamination induces collapsing for the former panels while debond is the key point of breaking for the latter panels.
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