| Metal and plastic connection is a hot topic in today's society,and its application in the field of automotive lightweight is the most typical.It can not only meet a variety of technical requirements,but also can save energy and reduce emissions,and meet the needs of green environmental protection in today's society.In this paper,304 stainless steel and automotive polypropylene/ethylene propylene diene rubber(PP+EPDM-T20)blend material as the research object,using fiber laser on the metal surface to prepare the structure,and under the condition of heating and pressure to connect the plastic.The effects of heating temperature,pressure,burr rate and coverage rate on the bonding strength of stainless steel and plastic were studied.The three biomimetic structures,honeycomb,leaf vein and interlocking of dragonfly head and neck hairs,were designed and obtained.The results show that the three biomimetic structures can improve the bonding strength of stainless steel and plastic,and the biomimetic structure with interlocking hairs on the head and neck of dragonfly can greatly improve the bonding strength of stainless steel and plastic.In this paper,the effects of heating temperature and pressure on the interface strength of stainless steel and plastic were studied by single factor control variable method,and the optimum process parameters of heating temperature and pressure were obtained.The results show that the shear force of 304 stainless steel and plastic is the largest when the heating temperature is 400?,is 700±10.00 N in this time.The joint strength increases with the increase of pressure.When the pressure is 70 k N,the shear force of the 304 stainless steel and plastic joint is the largest,is 760±10.58 N in this time.The height and number of burrs in the circular array structure after laser treatment have an important effect on the connection strength between stainless steel and plastic.When the burr height is 10?20?m and the burr rate is less than 14.82%,the metal and plastic break at the interface,and the shear force increases with the increase of the burr ratio.When the burr rate is higher than 14.82%,the bonding strength between stainless steel and plastic is greater than the strength of plastic itself,and the shear force fluctuates between893 N and 962 N,which is consistent with the average tensile fracture force of plastics of946 N.The coverage have an effect on bonding strength of laser processing area,the results show that the metal and plastic fittings in the plastic raw materials,the corresponding minimum coverage of 38.5%,the shear force is 901±14.18 N in this time.In this paper,three biomimetic configurations of honeycomb,leaf vein and dragonfly head and neck hairs interlocking were designed.The software ABAQUS was used to simulate and predict the promoting effects of the three biomimetic configurations on the connection strength between stainless steel and plastic,and the experiments were combined to verify the effects.All the three biomimetic configurations can improve the connection strength of stainless steel and plastic,and the interlocking biomimetic configuration of dragonfly's head and neck hairs can improve the connection strength of stainless steel and plastic more effectively,which is the best biomimetic structure.When other test parameters are the same and the burr rate is 5.81%,the shear forces of honeycomb structure,vein structure and dragonfly interlocking structure are all greater than those of the micro-pore array structure,and the shear forces of dragonfly interlocking structure are the largest,which is 835±10.44 N.When other test parameters were the same and the burr rate was7.66%,the micropore array structure was fractured at the interface between stainless steel and plastic,while honeycomb structure,leaf vein structure and dragonfly interlocking structure were all fractured at the plastic base material.The shear force of dragonfly interlocking structure was the largest,reaching 942±5.29 N. |
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