针刺预制体成型参数与C/C复合材料多目标力学性能响应模型研究

Response surface models on the needling processing parameters and the multiple mechanical performances of C/C composites

摘要:

基于响应曲面法,采用Design-expert系统研究了预制体针刺成型参数与C/C复合材料多目标性能的相关性,构建了响应曲面数学模型。分析结果表明,针刺C/C复合材料的拉伸强度、剪切强度、压缩强度、增强预制体体密度、拉伸强度与剪切强度比值各响应模型的显著性水平P均小于0.05,且各复相关系数平方和均大于0.82,模拟值与实测值吻合程度较高,可应用于针刺C/C复合材料各项目标性能的设计与预测。当针刺密度为12.18针/cm₂、针刺深度11.68mm、网胎面密度90.55g/m₂时,增强预制体体密度可达0.42g/cm₃,针刺C/C复合材料的综合力学性能最佳,其拉伸强度为116.49MPa、弯曲强度21.84MPa、剪切强度19.41MPa、压缩强度160.88MPa。

Abstract:

The mathematical models on the needling processing parameters and the multiple mechanical performances of needling C/C composites were established based on Response Surface Methodology by the design-expert system. The response surface models of tensile strength, shear strength,tensile strength and shear strength ratio,compression strength and preform density have high fitting degree, P of which is less than 0.05 and R-Squared of which is higher than 0.82. These response surface models are able to design and predict the needling processing parameters and the mechanical performances of needling C/C composites with reasonable accuracy. The comprehensive optimization results of multiple response targets of needling C/C composites show that: when the needling density is 12.18Pin/cm₂, the needling depth is 11.68mm and the Non-woven density is 90.55g/m₂, the comprehensive mechanical performances of needling C/C composites are the best. At this point, the tensile strength is 116.49MPa, the bending strength is 121.48MPa, the shear strength is 19.41MPa, the compression strength is 160.88MPa and the preform density is 0.42g/cm₃.