In a previous paper, a method has been developed to study the stability characteristics of laminar boundary layers over compliant walls. In this paper, the effect of double layered compliant wall and Kramer type compl...In a previous paper, a method has been developed to study the stability characteristics of laminar boundary layers over compliant walls. In this paper, the effect of double layered compliant wall and Kramer type compliant wall on delaying the transition is investigated, and it is shown that there does exist the possibility to de- lay the transition by applying such compliant walls.展开更多
CFRP/2A12 laminated structure due to the large difference in the properties of the material,very easy to produce defects when making holes,affecting the quality of the workpiece,and thus the connection performance of ...CFRP/2A12 laminated structure due to the large difference in the properties of the material,very easy to produce defects when making holes,affecting the quality of the workpiece,and thus the connection performance of the two materials.The root cause of the poor quality of CFRP/2A12 laminated structure is the difference in material removal mechanism and the complexity of tool processing conditions.Therefore,this paper analyzes the effects of different process parameters on the pore-forming quality of the laminated material through experiments,reveals the change law of cutting force of the CFRP/2A12 laminated structure,and determines the optimal process parameters.The results show:The axial force generated by the drill when it enters half of CFRP is the largest,which is much larger than the axial force generated when drilling 2A12 aluminum alloy plate,and the thickness of the laminated metal plate is great for drilling.The hole formation sequence of the laminated structure has a significant effect on the cutting force.The axial force when the laminated sequence is CFRP/2A12 is smaller than when the laminated sequence is 2A12/CFRP.展开更多
基金The project supported by the National Natural Science Foundation of China
文摘In a previous paper, a method has been developed to study the stability characteristics of laminar boundary layers over compliant walls. In this paper, the effect of double layered compliant wall and Kramer type compliant wall on delaying the transition is investigated, and it is shown that there does exist the possibility to de- lay the transition by applying such compliant walls.
文摘CFRP/2A12 laminated structure due to the large difference in the properties of the material,very easy to produce defects when making holes,affecting the quality of the workpiece,and thus the connection performance of the two materials.The root cause of the poor quality of CFRP/2A12 laminated structure is the difference in material removal mechanism and the complexity of tool processing conditions.Therefore,this paper analyzes the effects of different process parameters on the pore-forming quality of the laminated material through experiments,reveals the change law of cutting force of the CFRP/2A12 laminated structure,and determines the optimal process parameters.The results show:The axial force generated by the drill when it enters half of CFRP is the largest,which is much larger than the axial force generated when drilling 2A12 aluminum alloy plate,and the thickness of the laminated metal plate is great for drilling.The hole formation sequence of the laminated structure has a significant effect on the cutting force.The axial force when the laminated sequence is CFRP/2A12 is smaller than when the laminated sequence is 2A12/CFRP.
