工艺参数对复合材料长桁成型载荷的影响
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摘要
复合材料长桁机械成型过程中的成型载荷与成型工艺参数的关系会影响预制体成型过程的稳定性和长桁成型后的性能,利用自制复合材料L型长桁自动化成型机,搭建出一种长桁结构机械成型载荷测试系统,通过成型温度、成型速率、成型间距和铺层结构的研究,对成型载荷的变化规律进行测试和分析,探索出工艺参数与成型载荷之间的经验公式。结果表明:在合适的成型温度范围内,随着成型温度的逐渐升高,成型速率逐渐降低,成型间距逐渐增大,会使得成型载荷逐渐降低;铺层方式不同时,成型载荷变化情况为:[0°/45°/90°/–45°]_(ns)>[0°/90°]_(ns)>[±45°]_(ns);最后得到成型载荷与工艺参数关系的经验公式,在一定范围内对成型温度、成型速率、成型间距可具备实际指导能力。
The relationship between the forming load and the forming process parameters greatly affects the stability of the forming process and the performance of composite stringer preforms. By applying the domestic composite material L-shaped long automatic forming machine to build a mechanical forming load test system, the variation law of forming load was tested and analyzed through the study of molding temperature, molding rate, forming pitch and layup structure,which achieved an empirical formula between process parameters and forming load. The results show that, as the molding temperature gradually increases, the molding rate gradually decreases, on the other hand, the molding pitch gradually increases, which causes the decrease of molding load. When the lamination method is different, the molding load changes as follows: [0°/45°/90°/–45°]_(ns)>[0°/90°]_(ns)>[±45°]_(ns). Finally, an empirical formula for the relationship between the forming load and the process parameters is obtained, and the molding temperature, the forming rate, and the forming pitch can be practically guided within a certain range.
The relationship between the forming load and the forming process parameters greatly affects the stability of the forming process and the performance of composite stringer preforms. By applying the domestic composite material L-shaped long automatic forming machine to build a mechanical forming load test system, the variation law of forming load was tested and analyzed through the study of molding temperature, molding rate, forming pitch and layup structure,which achieved an empirical formula between process parameters and forming load. The results show that, as the molding temperature gradually increases, the molding rate gradually decreases, on the other hand, the molding pitch gradually increases, which causes the decrease of molding load. When the lamination method is different, the molding load changes as follows: [0°/45°/90°/–45°]_(ns)>[0°/90°]_(ns)>[±45°]_(ns). Finally, an empirical formula for the relationship between the forming load and the process parameters is obtained, and the molding temperature, the forming rate, and the forming pitch can be practically guided within a certain range.
引文
[1]SAMUEL B T.Permanent press,no wrin-kles:reinforced double diaphragm formings of advanced thermoset composites[D].Boston:Massachusetts Institute of Technology,2000.
[2]MONAGHAN M R,O’BRADAIGH C M,MALLON P J,et al.The effect of diaphragm stiffness of the quality of diaphragm formed thermoplastic composite components[J].Journal of Thermo-Plastic Composite Materials,1990,3(3):202-215.
[3]ELGAMEL H E.Closed-form expressions for the relationships between stress,diaphragm deflection,and resistance change with pressure in silicon piezoresistive pressure sensors[J].Sensors&Actuators APhysical,1995,50(1-2):17-22.
[4]PANTELAKIS S G,BAXEVANI E A.Optimization of the diaphragm forming process with regard to product quality and cost[J].Composite Part A:Applied Science and Manufacturing,2002,33(4):459-470.
[5]COGSWELL N F.The processing science of thermoplastic composites[J].Polymer International,1987,1(4):157-165.
[6]文琼化,王显峰,何思敏,等.温度对预浸料铺放效果的影响[J].航空学报,2011,32(9):1740-1745.WEN Qionghua,WANG Xianfeng,HE Simin,et al.Influence of temperature on placement effect of prepreg[J].Acta Aeronautica et Astronautica Sinica,2011,32(9):1740-1745.
[7]NING H,JANOWSKI G M,VAIDYA U K.单一膜片成形中碳/PPS的加工和非等温结晶动力学[J].复合材料学报,2010,44(8):915-929。NING H,JANOWSKI G M,VAIDYA U K.Processing and nonisothermal crystallization kinetics of carbon/PPS in single diaphragm forming[J].Journal of Composite Materials,2010,44(8):915-929.
[8]WIJSKAMP S.Shape distortions in composites forming[D].Enschede:University of Twente,2005.
[9]BARNESJ A,BYERLY G,LEBOUTONM C,et al.Dimensional stability effects in thermoplastic composites towards a predictive capability[J].Composites Manufacturing,1991,2(3):171-178.
[10]SPENCER A J M,WATSON P,ROGERS T G.Thermoelastic distortions in laminated anisotropic tubes and channel sections[J].Journal of Thermal Stresses,1992,15(1):129-141.
[11]NELSON R H.Prediction of dimensional changes in composite laminates during cure[C]//Proceedings of 34th International SAMPE Symposium.Reno,1989:2397-2410.
[12]KEANE M A,MULHERN M B,MALLON P J.Investigation of the effects of varying the processing parameters in diaphragm forming of advanced ther-moplastic composite laminates[J].Composites Manufacturing,1995,6(3-4):135-144.
[2]MONAGHAN M R,O’BRADAIGH C M,MALLON P J,et al.The effect of diaphragm stiffness of the quality of diaphragm formed thermoplastic composite components[J].Journal of Thermo-Plastic Composite Materials,1990,3(3):202-215.
[3]ELGAMEL H E.Closed-form expressions for the relationships between stress,diaphragm deflection,and resistance change with pressure in silicon piezoresistive pressure sensors[J].Sensors&Actuators APhysical,1995,50(1-2):17-22.
[4]PANTELAKIS S G,BAXEVANI E A.Optimization of the diaphragm forming process with regard to product quality and cost[J].Composite Part A:Applied Science and Manufacturing,2002,33(4):459-470.
[5]COGSWELL N F.The processing science of thermoplastic composites[J].Polymer International,1987,1(4):157-165.
[6]文琼化,王显峰,何思敏,等.温度对预浸料铺放效果的影响[J].航空学报,2011,32(9):1740-1745.WEN Qionghua,WANG Xianfeng,HE Simin,et al.Influence of temperature on placement effect of prepreg[J].Acta Aeronautica et Astronautica Sinica,2011,32(9):1740-1745.
[7]NING H,JANOWSKI G M,VAIDYA U K.单一膜片成形中碳/PPS的加工和非等温结晶动力学[J].复合材料学报,2010,44(8):915-929。NING H,JANOWSKI G M,VAIDYA U K.Processing and nonisothermal crystallization kinetics of carbon/PPS in single diaphragm forming[J].Journal of Composite Materials,2010,44(8):915-929.
[8]WIJSKAMP S.Shape distortions in composites forming[D].Enschede:University of Twente,2005.
[9]BARNESJ A,BYERLY G,LEBOUTONM C,et al.Dimensional stability effects in thermoplastic composites towards a predictive capability[J].Composites Manufacturing,1991,2(3):171-178.
[10]SPENCER A J M,WATSON P,ROGERS T G.Thermoelastic distortions in laminated anisotropic tubes and channel sections[J].Journal of Thermal Stresses,1992,15(1):129-141.
[11]NELSON R H.Prediction of dimensional changes in composite laminates during cure[C]//Proceedings of 34th International SAMPE Symposium.Reno,1989:2397-2410.
[12]KEANE M A,MULHERN M B,MALLON P J.Investigation of the effects of varying the processing parameters in diaphragm forming of advanced ther-moplastic composite laminates[J].Composites Manufacturing,1995,6(3-4):135-144.