Abstract:The low speed impact performances of HTS40/977-2 carbon fiber laminates single lap adhesively bonded joints were studied with numerical simulation using different adhesives.Firstly, the impact process of HTS40/999-2 laminates was simulated, and the effectiveness of material parameters of HTS40/977-2 laminates was verified compared with the test results.Then the constitutive model based on Hashin criterion was used to simulate the inner damage of the laminates and the cohesive element was used to simulate separation of inter-laminate and failure of adhesive layer.The finite element models for adhesively bonded joints with different adhesives including Araldite AV138, Araldite 2015 and Sikaforce 7752 were established to study their adhesive layers’ failure mode and energy absorption under impacts of 3 J and 4 J energy.It was shown that the failure modes of adhesively bonded joints of Araldite AV138, Araldite 2015 and Sikaforce 7752 are complete, partial and zero debonding between adhesive layers, respectively; different degrees of inter-laminate damage are observed for these 3 joints and their damage degrees decrease in turn; the energy absorptions for joints of Araldite AV138, Araldite 2015 and Sikaforce 7752 under 3 J energy shock are 2.73 J, 2.06 J and 1.67 J, respectively; their energy absorptions under 4 J energy shock are 2.91 J, 2.49 J and 2.26 J, respectively.The simulation results indicated that the failure modes and energy absorptions of adhesively bonded joints are closely related to properties of adhesives under low-velocity impact; the lower the toughness of adhesive, the more serious the joints’ damage and the more the energy absorption; the higher the toughness of adhesive, the stronger the joints’ anti-damage ability; the study can provide a reference for design and analysis of composite material adhesive bonding.
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