Investigation on Low-velocity Impact Damage and Characteristics of Compression after Impact of Thick-/thin-ply Composite Laminates
Comparing with the traditional thick layer carbon fiber reinforced resin matrix composites,the thin layer composites have obvious damage inhibition effect and better mechanical properties.Two kinds of thick/thin hybrid laminates were derived by using discrete and aggregation embedment methods based on thick-ply laminate,which were used to study the damage degree and distribution characteristics of composite structures under low energy impact loads,as well as the residual com-pression properties after impact.The delamination damage morphologies of three types of composite laminates with impact damage were revealed by ultrasonic C-scan and thermal peeling experiments,and the damage size was quantified.The experimental results showed that the"discrete"and"ag-gregate"modes of thin layer embedding into thick layer made full use of the damage suppression effect of thin layer composite,the centrosymmetric distribution of layered damage and the distribu-tion position of characteristic layered damage along the thickness direction were changed,and the re-sidual compression performance of composite laminates was improved.
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