树脂传递模塑成型(resin transfer molding, RTM)工艺是树脂基复合材料制造中主要的一种成型工艺,对该工艺的模拟仿真可在RTM制件的工艺设计优化方面起到关键作用。本工作以实际RTM工艺生产需求为基础,在二维等温RTM工艺仿真程序基础上...树脂传递模塑成型(resin transfer molding, RTM)工艺是树脂基复合材料制造中主要的一种成型工艺,对该工艺的模拟仿真可在RTM制件的工艺设计优化方面起到关键作用。本工作以实际RTM工艺生产需求为基础,在二维等温RTM工艺仿真程序基础上,突破热流耦合计算等关键技术,采用控制体有限元(CV/FEM)方法,研发三维非等温RTM成型仿真模型。该仿真模型基于Darcy方程、连续性方程、能量守恒方程、固化反应方程以及多个流变固化模型,采用半离散方法和三收敛标准,可有效解决非等温RTM仿真过程的模具预热、树脂非等温充填过程的黏度变化、固化放热等仿真问题,经过平板实验件及机匣件应用验证,可有效预测RTM充填时间、速度及压力等关键结果,结果精度与国际同类产品相当,在核心仿真能力上达到了国外商业仿真模型的同等水平,基本具备了针对实际复杂结构零件开展仿真的能力。展开更多
The final thickness of a product after the vacuum infusion process （VIP）, which is equal to the fiber volume fraction, depends in part on the compression responses of the preform because one of the mold faces is fle...The final thickness of a product after the vacuum infusion process （VIP）, which is equal to the fiber volume fraction, depends in part on the compression responses of the preform because one of the mold faces is flexible in VIE This study aims at investigating the compression responses of different fabrics under dry or wet conditions. The main factors affecting the compression response under investigation include, the vacuum pressure, the loading and unloading repeatability on the preform, the layup design, the kinds of fabrics, and the resin viscosity. Besides, the effects of some internal factors such as nesting and elastic recovery of fibers, lubrication of resin, friction between fibers, and so on, are also studied. In the end, this article expatiates the meaning of the matching requirements of the permeability of the preform and that of the distribution medium.展开更多
文摘树脂传递模塑成型(resin transfer molding, RTM)工艺是树脂基复合材料制造中主要的一种成型工艺,对该工艺的模拟仿真可在RTM制件的工艺设计优化方面起到关键作用。本工作以实际RTM工艺生产需求为基础,在二维等温RTM工艺仿真程序基础上,突破热流耦合计算等关键技术,采用控制体有限元(CV/FEM)方法,研发三维非等温RTM成型仿真模型。该仿真模型基于Darcy方程、连续性方程、能量守恒方程、固化反应方程以及多个流变固化模型,采用半离散方法和三收敛标准,可有效解决非等温RTM仿真过程的模具预热、树脂非等温充填过程的黏度变化、固化放热等仿真问题,经过平板实验件及机匣件应用验证,可有效预测RTM充填时间、速度及压力等关键结果,结果精度与国际同类产品相当,在核心仿真能力上达到了国外商业仿真模型的同等水平,基本具备了针对实际复杂结构零件开展仿真的能力。
文摘The final thickness of a product after the vacuum infusion process （VIP）, which is equal to the fiber volume fraction, depends in part on the compression responses of the preform because one of the mold faces is flexible in VIE This study aims at investigating the compression responses of different fabrics under dry or wet conditions. The main factors affecting the compression response under investigation include, the vacuum pressure, the loading and unloading repeatability on the preform, the layup design, the kinds of fabrics, and the resin viscosity. Besides, the effects of some internal factors such as nesting and elastic recovery of fibers, lubrication of resin, friction between fibers, and so on, are also studied. In the end, this article expatiates the meaning of the matching requirements of the permeability of the preform and that of the distribution medium.
