| Carbon fiber composite laminates have the advantages of high specific strength and high specific stiffness.Therefore,they are more and more widely used in actual engineering,but defects such as brittleness also restrict their further development.Amorphous alloys have high strength,high toughness,and large elastic energy storage,and have broad application prospects in the engineering field.If the amorphous alloy is combined with the carbon fiber composite material,it will help to merge the advantages of the two and further improve the performance of the carbon fiber polymer composite material.In this study,compression molding technology was used to prepare amorphous alloy ribbon unidirectional reinforced carbon fiber polymer composite laminates,and the following studies were conducted on the interface,bending,impact and vibration damping properties of the composite laminates:(1)Through the bending and impact performance tests of amorphous alloy reinforced composite laminates with different contents and distributions,the results show that the content of the amorphous ribbon with the highest bending performance improvement is 3.5wt.%,compared with the non-added amorphous alloy The relative strength of the laminate is increased by 9.8%.In the case where the amorphous alloy ribbon content is 1.8wt.%,the impact strength of the amorphous ribbon is the largest when the amorphous ribbon is on the opposite side of the laminate,which is increased by 35.7%;after determining the best location,it was found that the content of 3.5wt.%amorphous ribbon had the greatest improvement in impact toughness,which was increased by 45.5%.(2)The content and distribution of amorphous ribbon have a greater impact on the damping vibration performance of laminates.The damping ratio is increased most when the content of amorphous alloy ribbon is 3.5wt.%,which is higher than that of laminates without added amorphous alloys.41.6%,but the addition of amorphous alloy ribbon did not significantly change the first-order natural frequency of the laminate.(3)Mechanical treatment of the surface of the amorphous ribbon with different grades of sandpaper showed that:60#sandpaper has the best effect of improving the interface bonding state,the maximum debonding force is 31.5%higher than the untreated sample,and the failure displacement is higher than the untreated test.The sample has been improved by 50.9%;the most improved bending performance is the laminate made of amorphous ribbon mechanically treated with 240#sandpaper,and the relative strength,relative modulus and impact toughness are 397.8 MPa/g,20.0GPa/g and 230.6 k J/m~2,respectively,compared with untreated amorphous alloy composite laminates increased by 7.7%,4.6%and 22.1%,indicating that the mechanical treatment of the surface of the amorphous ribbon is not very obvious for the improvement of the static mechanical properties of the laminate,But has a greater improvement in dynamic mechanical properties.The natural frequency increased the most by the laminated plate prepared after 240#mechanical treatment of the ribbon,and the damping ratio increased the most by the laminate prepared after the 60#sandpaper mechanical treatment of the ribbon.(4)The surface treatment of amorphous ribbon with different concentrations of coupling agents showed that:25%concentration of silane coupling agent has the best effect on improving the interface bonding;relative strength,relative modulus,impact toughness and first-order natural frequency are all first After the increase,it tended to be gentle,reaching the optimal value at 20%concentration,and increased by 15%,5.2%,26.3%and 20.0%on the basis of the blank sample.However,the damping ratio decreased with the increase of the coupling agent concentration,and reached the minimum value at 20%concentration.The damping ratio decreased by 15.0%compared with the untreated ribbon laminate. |
PDF Full Text Request