Mechanical Properties Of Magnesium Based Fiber Laminates Manufactured By Powder Lamination

As Fiber-reinforced metal laminates(FMLs)are a combination of metals and composites,they possess the advantages of the both materials including excellent impact property,residual strength property,elevated damage tolerance and superior fatigue properties.FMLs is a good substitute for the traditional alloy materials to reduce the weight and energy saving at the same time to get better performance.Application of FMLs in aerospace is mostly aluminum based FMLs.As advantages of the application of magnesium alloys over aluminium alloys,such aslow density,improved electromagnetic shielding capability,superior corrosion resistance and superior damping property.Magnesium alloy instead of aluminum alloy in the preparation of FMLs can further reduce the weight improve the stability of the vehicle operation.The traditional fiber metal laminate(FMLs)are mostly manufactured by thermosetting resin,However,the long and expensive processing cycles which is required to ensure complete curing of the thermosetting matrix is the main disadvantage of this process.In order to overcome the disadvantages of thermosetting FMLs,a number of novel FMLs based on thermoplastic matrices have been developed and tested.Thermoplastic-based fibre–metal laminates offer a number of advantages including very short processing times,ease of forming,improved chemical resistance,excellent repairability and superiorinterlaminar fracture toughness properties.Extensive testing on a glass fibre-reinforced polypropylene FML has shown that this system offers an excellent resistance to low and high velocity impact loading conditions.In this paper,A novel processisproposed for cost effective manufacturing of fiber metal laminate with woven glass fiber,maleicanhydride modified polypropylene power and AZ31 B magnesium alloy.the novel process can reduce the long processing cycles and expensive cost.The mechanical tensile,interlaminar shear,flexural,impact and vibration properties were studied at room temperature to evaluated the mechanical properties of novel FMLspre-treatment of the AZ31 B magnesium alloy surface need to be done in order to improve the inherently weak interlaminar bond strength between the magnesium alloy and resin prior to laminating.The influence of various surface treatment methods on mechanical tensile,interlaminar shear,bending and impact properties were studied for evaluation andenhancement of the novel process.The results indicate thatwith the increase of surface roughness the Interface mechanical interlock between magnesium and resins become higher.Which in turn enhance mechanical properties of novel FMLs.After silane treatment,silane film is formed on the surface of magnesium alloy,Therefore,which greatly improved the interlaminar shear strength and obtained the optimum comprehensive mechanical properties.After the NaCl solution etching,the micro pores and the resin formed mechanical interlockto increase the interlaminar shear strength.Because of the formation of micro defects on the surface of magnesium plate after plasma cleaning,the interlaminar shear strength decreased.Effect of fiber reinforced resin'thickness on the mechanical properties of FMLsare studied in this paper.The results show that the introduction of woven glass fiber increases the interlaminar shear strength of FMLs,and the bending strength decreases with the increase of fiber's thickness.With the increase of the fiber reinforce resin thickness,the natural vibration frequency of FMLs becomes higher.the best vibration performance is obtained by 2 layer woven glass fiber reinforced FMLs.Analysis ofFourier transform infrared spectroscopy of magnesium plate after silane treatment indicate that silane and the magnesium plate is tightly coupled together by the Si-O-Mg bond,greatly improve the bonding strength between metal and resin.the interlaminar shear strength and flexural strength of magnesium based FMLs have been also greatly improved.Mechanical tensile,flexural,interlaminar shear and impact test are taken to investigate the properties of FMLs with different structures.The results show that the tensile strength of FMLs with 3/2 structure is slightly lower than that with 2/1 structure,and the flexural strength,interlaminar shear strength and impact strength are higher than that with 2/1 structure.The interlaminar shear strength of FMLs under different spans was analyzed,The results show that the Interlaminar shear strength increases with the decrease of span.