Study On The Roll Forming Mechanism And Mechanical Properties Of Composite Laminate

With the development of modern composite material industry,composite laminate has been widely used in aviation,machinery,equipment manufacturing and other fields.Because of its good lightweight characteristics,mechanical characteristics,composite laminates have strong advantages in the shell manufacturing of equipment and the manufacturing of structural parts.However,due to the strong designability of composite laminates and the dependence on the composite processes,it is necessary to conduct material selection,structure and preparation processes design separately for manufacturing composite laminates under different usage requirements.In addition,the composite laminate plate is composed of multiple components,and there are performance differences between each component,so at present,only the one-time preparation of composite laminate required could be conducted,lack of the reference basis and processing experience for its secondary manufacturing process,which restricts at a certain extent to the industrialization of composite laminates,and increases its application costs.In terms of mechanical properties,study on the mechanical properties of composite laminate is difficult owing to the anisotropic and non-homogeneous properties of composite laminates.This paper mainly focuses on the determination of the preparation process,the exploration of the rolling mechanism and the mechanical properties of "sandwich-type" magnesium alloy-polyethylene composite laminate.The main contents of this paper include:1.The preparation process and the experimental determination of the basic parameters of the composite laminate.The three-step preparation method of "glue-pressing-rolling" of magnesium alloy-polyethylene composite laminate is obtained,and a method of evaluating the interlaminar bonding strength and measuring the comprehensive stiffness are proposed.2.Simulation and experiment of composite laminate rolling process and secondary rolling process,carried out the rolling experiment and secondary rolling experiment,explored the internal relationship between rolling force in the rolling stage,static pressure,rest time under pressure and press quantity,the elastic recovery rate and the contribution rate of press quantity of each component in the secondary rolling process were obtained,the results were verified by simulations in ANSYS Workbench,in order to provide reference for the engineering application of the sheet.3.The performances of tensile strength,compression resistance and vibration absorption of the composite laminate were tested,and the simulation verification wascarried out.The tensile strength and compression strength of the laminate plate were measured by experiment,whose simulation was also conducted respectively based on ANSYS Workbench as comparison,the influencing factors and pattern of the vibration absorption performance of the composite laminate were obtained by experiment.The results of the research show that the interlaminar bonding strength between the magnesium alloy and polyethylene is 0.97 MPa,the tensile-shear strength is around 1.09 MPa,the maximum interlaminar destructive force is about 3.83 k N,the stiffness of the laminate is 1.182? 107N/m approximately,and the surface hardness is related to the thickness of the components;the static pressure in the pressuring stage,static pressing time and the mill's press quantity have a certain impact on the rolling force,the secondary rolling effect is determined by the set press quantity;there is a quantitative regularity between component ratio and the tensile and compressive performance of the laminate,and it has good absorption in low-frequency vibration environment.