聚甲基丙烯酰亚胺泡沫压缩失效寿命预测及模型验证

孟豪宇; 陈博; 宋江; 孙超明; 闫承磊; 安昕; 张涛

doi:10.13801/j.cnki.fhclxb.20220314.003

聚甲基丙烯酰亚胺泡沫压缩失效寿命预测及模型验证

doi: 10.13801/j.cnki.fhclxb.20220314.003

北京玻钢院复合材料有限公司，北京 102101

详细信息

通讯作者:
孙超明，硕士，教授级高工，研究方向为树脂基功能复合材料　E-mail：sunchm@sinomatech.com

中图分类号: TQ32
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- 文章访问数: 464
- HTML全文浏览量: 198
- PDF下载量: 38
- 被引次数: 0
出版历程
- 收稿日期: 2022-01-13
- 修回日期: 2022-02-15
- 录用日期: 2022-03-03
- 网络出版日期: 2022-03-16
- 刊出日期: 2023-02-15

Compression failure life prediction and verification of polymethacrylimide foam

Beijing Composite Materials CO., LTD., Beijing 102101, China

摘要

摘要: 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/cm³和0.110 g/cm³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/cm³PMI泡沫压缩蠕变失效寿命约为11年；而密度0.110 g/cm³ PMI泡沫约为53年，同时对模型的可靠性进行了验证分析。
- PMI泡沫 /
- 压缩蠕变 /
- 蠕变模型 /
- 恒定载荷 /
- 寿命
Abstract: 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/cm³ and 0.110 g/cm³ 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/cm³ is about 11 years. The density of 0.110 g/cm³ PMI foam is about 53 years, and the reliability of the model is verified and analyzed.
- PMI foam /
- compression creep /
- creep model /
- constant load /
- life

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图 1 加载工装示意图

Figure 1. Schematic diagram of loading tooling

1—Bolt; 2—Side panel; 3—Lower platen; 4—Bottom plate; 5—On board; 6—Upper platen; 7—Custom spring; 8—Foam sample; 9—Measuring hole

下载: 全尺寸图片幻灯片

图 2 0.075 g/cm³ PMI泡沫在不同载荷下的蠕变曲线

Figure 2. Creep curves of 0.075 g/cm³ PMI foams under different loads

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图 3 0.110 g/cm³ PMI泡沫在不同载荷下的蠕变曲线

Figure 3. Creep curves of 0.110 g/cm³ PMI foams under different loads

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图 4 0.075 g/cm³ PMI泡沫在不同时间及载荷下的拟合曲线

R²—Fitting coefficient; a—Multiple; b—Index

Figure 4. Fitting curves of 0.075 g/cm³ PMI foams at different time and loads

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图 5 0.110 g/cm³ PMI泡沫在不同时间及载荷下的拟合曲线

Figure 5. Fitting curves of 0.110 g/cm³ PMI foams at different time and loads

下载: 全尺寸图片幻灯片

图 6 两种密度PMI泡沫在不同载荷下所对应的lgA-lgσ线性拟合曲线

A—Creep parameter; σ—Stress

Figure 6. lgA-lgσ linear fitting curves of two densities of PMI foams under different loads

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表 1 聚甲基丙烯酰亚胺(PMI)泡沫编号

Table 1. Number of polymethacrylimide (PMI) foams

Specimen number	Density/(g·cm⁻³)	Load/N
A-1	0.075	937.5
A-2	0.075	1250.0
A-3	0.075	1562.5
A-4	0.075	1875.0
B-1	0.110	937.5
B-2	0.110	1250.0
B-3	0.110	1562.5
B-4	0.110	1875.0

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表 2 不同载荷及时间下0.075 g/cm³PMI泡沫蠕变应变

Table 2. Creep strain of 0.075 g/cm³ PMI foams under different loads and time

Time/h	A-1	A-2	A-3	A-4
0	0	0	0	0
168	0.000450	0.000630	0.000985	0.001260
336	0.000845	0.001160	0.001770	0.002330
720	0.001170	0.001580	0.002470	0.002900
1440	0.001480	0.002040	0.003060	0.003670
2160	0.001690	0.002310	0.003460	0.004170
2880	0.001840	0.002510	0.003860	0.004670
3600	0.001980	0.002650	0.004240	0.005060
4320	0.002120	0.002800	0.004450	0.005480

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表 3 不同载荷及时间下0.110 g/cm³ PMI泡沫蠕变应变

Table 3. Creep strain of 0.110 g/cm³ PMI foams under different loads and time

Time/h	B-1	B-2	B-3	B-4
0	0	0	0	0
168	0.000310	0.000462	0.000602	0.000833
336	0.000523	0.000710	0.000919	0.001273
720	0.000751	0.000908	0.001393	0.001747
1440	0.001046	0.001191	0.001586	0.002079
2160	0.001118	0.001302	0.001747	0.002357
2880	0.001282	0.001402	0.001989	0.002669
3600	0.001420	0.001518	0.002190	0.002893
4320	0.001565	0.001616	0.002290	0.003094

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表 4 0.075 g/cm³ PMI泡沫不同载荷下拟合模型参数

Table 4. Fitting model parameters of 0.075 g/cm³ PMI foams under different loads

Sample	Model parameters
Sample	A	A₃	R²
A-1	8.74×10⁻⁵	0.38308	0.97667
A-2	1.32×10⁻⁴	0.36915	0.98022
A-3	1.82×10⁻⁴	0.38437	0.99314
A-4	2.36×10⁻⁴	0.37541	0.98273

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表 5 0.110 g/cm³ PMI泡沫不同载荷下拟合模型参数

Table 5. Fitting model parameters of 0.110 g/cm³ PMI foams under different loads

Sample	Model parameters
Sample	A	A₃	R²
B-1	4.20×10⁻⁵	0.43127	0.98916
B-2	9.61×10⁻⁵	0.33823	0.98860
B-3	1.18×10⁻⁴	0.35561	0.97981
B-4	1.52×10⁻⁴	0.36000	0.99185

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表 6 0.075 g/cm³ PMI泡沫在不同载荷下的剩余载荷

Table 6. Residual load of 0.075 g/cm³ PMI foams under different loads

Sample	Initial load/N	Average creep/mm	Residual load/N	Residual stress/MPa
A-1	937.5	0.002120	936.864	0.374746
A-2	1250.0	0.002800	1249.160	0.499664
A-3	1562.5	0.004450	1561.165	0.624466
A-4	1875.0	0.005480	1873.356	0.749342

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表 7 0.110 g/cm³ PMI泡沫在不同载荷下的剩余载荷

Table 7. Residual load of 0.110 g/cm³ PMI foams under different loads

Sample	Initial load/N	Average creep/mm	Residual load/N	Residual stress/MPa
B-1	937.5	0.062608	936.952	0.374781
B-2	1250.0	0.064634	1249.434	0.499774
B-3	1562.5	0.091596	1561.699	0.624680
B-4	1875.0	0.123757	1873.917	0.749567

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