Study On Low Velocity Impact Response Of Composite Sandwich Plate

Metal foam composite sandwich structures have many advantages,such as high specific strength and high specific modulus,and excellent fatigue,corrosion resistance and buffering energy absorption properties.It is widely used in aerospace,construction,sports equipment,medical equipment and other fields,due to the excellent performance of metal foam composite sandwich structure.Many problems have emerged in the wide range of applications,it is unavoidable to be impacted by various external objects in the actual application process of the sandwich structure,impact damage makes the stiffness and strength of sandwich structure change,and the safety of the sandwich panel will be reduced.In order to accurately predict the damage,energy absorption and residual strength of the metal foam composite sandwich structure after low velocity impact,the mechanical response of aluminum foam composite sandwich plate was studied under the low velocity impact of different core thickness and impact energy through the test and finite element simulation in this paper.The study was done.The specific research contents are as follows:First of all,the research progress on low velocity impact damage of composite laminates at home and abroad,low velocity impact damage of composite sandwich structure and residual compressive strength of composite sandwich structure are summarized and discussed.Secondly,the low velocity impact mechanical properties of aluminum foam core composite sandwich panels were studied by experimental method.The effect of different core thickness and impact energy on the failure mode,energy absorption performance and initial stage elastic stiffness of composite sandwich panels was studied by drop hammer impact test.Then,the finite element software ABAQUS/Explicit explicit dynamic analysis module is used to establish the finite element model of sandwich panel low-speed impact,and the convergence is verified.The validity of the finite element model is verified by comparing the numerical simulation results with the experimental results.The delamination damage of sandwich panels was also analyzed by establishing cohesive units between adjacent ply and panel and aluminum foam core.Finally,the residual compressive strength of core sandwich 10 mm sandwich panels was tested,and the residual compressive strength of sandwich panels under different impact energy was studied.The finite element simulation method is used to predict the residual compression strength of the sandwich panel,and the simulation results are compared with the experimental results to verify the effectiveness of the finite element simulation method.