Research On Mechanical Properties Of STEEL/GFRP Laminates And Its Application

With the development of economy,lightweight design is becoming more and more popular in aut om obil e.Generally,new material is one of the important ways to realize automotive lightweight,and they are gradually used in automobile.Fiber metal laminate(FML)is typically one of new material.FML combines metal laminates and fiber reinforced polymer composite layers by adhesive or mechanical connections.Thus,FML has high specific strength,specific stiffness,good fatigue resistance performance,and have the toughness and workability.Besides,it also has many characteristics,such as corrosion and flame resistance.In this paper,the glass fiber reinforced steel laminate was manufactured by hot moldi ng proc ess,and i t s m ech ani c al p rope rt y and appl i c at i on o n b at t er y pa ck was st udi ed.In this paper,the STEEL/GFRP laminate material was made by hot molding process with 304 stainless steel and continuous glass fiber reinforced polypropylene(GFRP)as raw material.In order to study its mechanical properties,tensile tests and three-point bending tests were carried out according to the test standard.The failure modes and damage morphology were observed and analyzed.In addition,the tensile tests and three point bending tests were simulated by finite element method.The accuracy of finite element model was verified by comparison with experimental data and phenomena.In order to study the effect of surface steel thickness,GFRP layer thickness and material type on the bending performance of laminated plates,a series of FMLs were prepared,and three point bending tests were carried out.After summarizing and analyzing the experimental phenomena,it is found that the bending performance of STEEL/GFRP increases first and then decreases w hen the thickness of STEEL or GFRP increases.According to the test results,the bending performance of STEEL/GFRP with 0.08 mm thick STEEL and two-layer GFRP is optimal.In addition,the STEEL in STEEL/GFRP is replaced with aluminum.It is found the properties of metal in FML play a decisive role in the performance of FML and the bending performance of STEEL/GFRP is much stronger than that of AL/GFRP.Finally,the structure of a small electric car battery pack was improved based on the STEEL/GFRP material.The finite element analysis was carried out on the STEEL/GFRP battery pack under the extrusion condition,and the original steel battery pack were analyzed too.By comparing the force condition and the deformation of each part,it was found that the perfor mance of the STEEL/GFRP battery pack was better and the weight loss rate was up to 29.7%.