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利用热模压工艺制备玻璃纤维增强聚丙烯(GF/PP)复合材料层合板,通过差示扫描量热(DSC)法试验分析,确定相变参数,运用ANSYS有限元分析,将复合材料热力学参数与温度的非线性关系定义到材料特性中,研究模压成型过程中温度场变化情况,为模压成型工艺制度的确立提供理论指导和依据。以压缩强度、层间剪切强度和冲击韧性作为力学性能评价指标,采用响应曲面法探讨和分析制备工艺对GF/PP复合材料层合板力学性能的影响,得到最优模压工艺制备参数,获得最高复合材料层合板力学性能,为GF/PP复合材料自动铺放奠定铺放工艺基础。试验结果表明:模压加热工艺参数对复合材料层合板力学性能的影响度(从大到小)依次为:热压温度、热压时间、热压压力。较优的模压加热工艺参数为:热压温度228℃、热压时间6min、热压压力1.1MPa,在此工艺条件下制备的GF/PP复合材料层合板,层间剪切强度为31.12 MPa,压缩强度为100.96 MPa,冲击韧性为2.27kJ/cm~2。
The glass fiber reinforced polypropylene (GF / PP) composite laminates were prepared by hot stamping process, and the phase transition parameters were determined by the differential scanning calorimetry (DSC) method. The ANSYS finite element analysis was used to compare the thermodynamic parameters The non-linear relationship between temperature and material properties is defined. The change of temperature field in the process of die-forming is studied to provide theoretical guidance and basis for the establishment of the molding process system. The compressive strength, interlaminar shear strength and impact toughness were taken as the evaluation indexes of mechanical properties. The influence of preparation process on the mechanical properties of GF / PP composite laminates was investigated by response surface methodology. The optimum molding process parameters were obtained and the highest The mechanical properties of composite laminates lay the foundation of laying technology for automatic laying of GF / PP composite materials. The experimental results show that the influence degree of molding process parameters on the mechanical properties of composite laminates is as follows: hot pressing temperature, hot pressing time and hot pressing pressure. The optimal process parameters of molding and heating were as follows: hot press temperature 228 ℃, hot press time 6min, hot press pressure 1.1MPa. Under the optimal conditions, the interlaminar shear strength of GF / PP composite laminates was 31.12 MPa, The compressive strength is 100.96 MPa and the impact toughness is 2.27 kJ / cm ~ 2.