Research On The Forming Process And Performance Of Carbon Fiber Composite Car Inner Plate And Anti-collision Beam

As the world energy crisis intensifies,the lightweight of automobiles has became an important direction for the development of the automotive industry.Carbon fiber reinforced composites?CFRP?have become a hot research topic in the automotive industry due to its advantages of light weight and high strength.In the background of automobile lightweighting,this paper studies the molding process of carbon fiber composite materials for the inner panel and anti-collision beam.DSC is used to characterize the curing exothermic performance of the resin and formulate the curing scheme.Rheological properties of resins were studied by rotational rheometer.Testing the mechanical properties of carbon fiber composite laminates with ASTM standards.The PAM-RTM is used to optimize the runner design of the door inner panel,which provides a reference for the VARI process of the carbon fiber composite door inner panel.FiberSIM is used to analyze the laying property of pre-formed body of anti-collision beam and door inner panel.Making carbon fiber composite door inner panel through VARI process.Using Abaqus to determine the layering scheme of the anti-collision beam.Using the autoclave process to make the anti-collision beam sample.Testing the three-point bending performance of the anti-collision beam with a universal testing machine and compare it with the analysis results.?1?Testing the curing exothermic properties of BAC 177 and BAC 172 resins by dynamic DSC and isothermal DSC and formulating the curing scheme.The curing scheme of BAC 177 resin is77?/60 min+103?/30+146?/30 min,and the curing scheme of BAC 172 resin is 82?/30min+134?/30 min+159?/30 min.The rheological properties of BAC 177 and BAC 172 resin were characterized by a rotational rheometer,and BAC 172 resin is more operable at room temperature than BAC 177.The mechanical properties of composite laminates of BAC 177 and BAC 172 resin were compared,and the rheological properties of the resin were comprehensively analyzed.BAC 172 resin was used to develop the carbon fiber composite door inner panel.?2?The heat release characteristics of the unidirectional prepreg were characterized by DSC,and the autoclave process curing scheme of the unidirectional prepreg was determined.The prepreg needs to be boosted to 600 KPa at 125°C for 15 min,and then heated to 146°C for 30 min to cure.The mechanical properties of the unidirectional prepreg were characterized.The 0°tensile strength was 2748 MPa,and the tensile modulus was 154 GPa.The 0°compression strength was 725 MPa,and the modulus was 115 GPa.The 0°bending strength was 1048 MPa.,and the modulus is 106GPa,The 90°tensile strength is 32 MPa,and tensile modulus is 8 GPa.The 90°compressive strength is 169 MPa,and the modulus is 7 GPa,The 90°bending strength is 74 MPa,modulus is 8GPa,.Short beam shear strength is 100 MPa.?3?FiberSIM was used to analyze the pavement of the anti-collision beam and the inner panel of the door,and the laying effect of the laminate was optimized by Darts,and the CAD drawing was exported to guide the preform cutting.The permeability and porosity of T700NCF carbon fiber cloth were tested by one-way method.The porosity of NCF cloth under VARI process was 56%,the longitudinal permeability was 4.4?9?10^-10 m²,and the transverse permeability was 2.2?9?10^-10m².The PAM-RTM was used to analyze the flow path of the inner panel of the door,and the perfusion time was 39 min.?4?According to the analysis results of FiberSIM and PAM-RTM,BAC 172 resin was used to fabricate carbon fiber composite door inner panel.The actual perfusion time was 50 min.Abaqus was used to simulate the three-point bending test of the anti-collision beam,and the anti-collision beam sample was made according to the analysis results of Abaqus and FiberSIM.The three-point bending test of the anti-collision beam was carried out,and the maximum load was 14.89 KN,and the maximum displacement was 31.5 mm.The carbon fiber composite door inner panel and the anti-collision beam were weighed and compared with the steel sample.The inner panel of the door was reduced by 27%,and the anti-collision beam was reduced by 45%.