聚甲基丙烯酰亚胺泡沫压缩失效寿命预测及模型验证

Compression failure life prediction and verification of polymethacrylimide foam

聚甲基丙烯酸酰亚胺(PMI)泡沫因其性能优越,在航空航天领域广泛应用。本文主要针队PMI泡沫在弹筒适配器领域的功能特性开展研究,主要研究了其在常温条件下的压缩蠕变特性。依据使用工况及高分子材料的蠕变特性,采用“时间强化”模型设计实验,分别对密度为0.075 g/cm^(3)和0.110 g/cm^(3)的PMI泡沫进行了为期180天的常温压缩蠕变实验。通过对实验数据分析、拟合,预测了两种不同密度的PMI泡沫常温、1250 N条件下的压缩蠕变寿命,密度0.075 g/cm^(3)PMI泡沫压缩蠕变失效寿命约为11年;而密度0.110 g/cm^(3)PMI泡沫约为53年,同时对模型的可靠性进行了验证分析。

Polymethacrylate imide(PMI)foam is widely used in aerospace field because of its superior performance.This paper mainly studies the functional characteristics of PMI foam in the field of cartridge adapter,and mainly studies its compression creep characteristics at room temperature.According to the working conditions and creep characteristics of polymer materials,the"time strengthening"model was adopted to design experiments,and the PMI foam with densities of 0.075 g/cm^(3)and 0.110 g/cm^(3)were respectively tested for 180 days under normal temperature compression creep.By analyzing and fitting the experimental data,the compression creep life of two PMI foam with different densities at room temperature and 1250 N was predicted.The compression creep failure life of PMI foam with density of 0.075 g/cm^(3)is about 11 years.The density of 0.110 g/cm^(3)PMI foam is about 53 years,and the reliability of the model is verified and analyzed.