Abstract: With the extensive application of fiber reinforced composite, the study on its compression property under hygrothermal environment therefore is provided with theory research significance and practical application value. In this paper, the impact mechanical performances of carbon fiber reinforced resin matrix (Carbon/Epoxy) composite laminates under the condition of hygrothermal and high strain rate were investigated using split hopkinson pressure bar (SHPB). First, both hygrothermal treated specimens and dry specimens were prepared. And then impact mechanical behaviors of carbon fiber laminates under hygrothermal environment were studied using SHPB impact experiments. The results indicate that Carbon/Epoxy laminates have the strain rate sensitivity in the vertical direction, the maximum stress of the composite specimens increases nearly threefold as the strain rate increases from 1500s-1 to 6000s-1,, with an extremely slight change of the elastic modulus. Meanwhile, hygrothermal treatment can also improve the dynamic mechanical performance of this kind of material, the wet specimens exhibit higher dynamic compression strength perpendicular to the fiber ply, up to 12.45% compared to the dry specimens after 20 days hygrothermal treatment, and this phenomenon is more significant when the strain rate is relatively low.
Keywords: carbon fiber reinforced composites; hygrothermal environment; high strain rate; dynamic compression; SHPB