基于Biot固结原理和达西定律,建立了二维树脂流动与纤维密实模型,采用有限元方法实现了L形层板热压成型过程树脂压力分布、层板变形的预测.通过对AS4炭纤维/环氧3501-6等厚层板厚度变化的模拟结果与实验数据的对比分析,证明了数学模型和有限元程序的可靠性.以阳模成型90°铺层S-2玻璃纤维/环氧648L形层板为例,对工艺过程层板厚度变化进行了分析.模拟结果表明:剪切模量对拐角以及拐角与平板过渡区域的变形影响较大;平板长度对拐角区域变形影响较明显,对平板区的变形影响较小.采用热压罐制备了90°铺层S-2玻璃纤维/环氧648阳模成型L形层板,实验数据表明,固化后层板呈现拐角区厚、平板区薄的厚度不均现象,并且平板长度对拐角区厚度变化影响较显著,这与数值预测结果具有较好的一致性.
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