三维针刺SiO<sub>2f</sub>/SiO<sub>2</sub>复合材料高温拉-拉疲劳特性

王恒; 张培伟; 徐培飞; 陈强; 费庆国

doi:10.13801/j.cnki.fhclxb.20230710.001

三维针刺SiO_2f/SiO₂复合材料高温拉-拉疲劳特性

doi: 10.13801/j.cnki.fhclxb.20230710.001

王恒^{1, 2},
张培伟^{1, 2, ,},
徐培飞^{1, 2},
陈强^{1, 2},
费庆国^{1, 2}

1.
东南大学　机械工程学院，南京 211189
2.
高速飞行器结构与热防护教育部重点实验室，南京 211189

基金项目: 国家杰出青年科学基金(52125209)；江苏省六大人才高峰(XCL-008)

详细信息

通讯作者:
张培伟，博士，副教授，硕士生导师，研究方向为先进复合材料失效行为研究　E-mail：zhangpeiwei@seu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2023-04-21
- 修回日期: 2023-05-24
- 录用日期: 2023-06-08
- 网络出版日期: 2023-07-11
- 刊出日期: 2024-02-01

Tensile fatigue of three-dimensional needling SiO_2f/SiO₂ composites at high temperatures

WANG Heng^{1, 2},
ZHANG Peiwei^{1, 2
, ,},
XU Peifei^{1, 2},
CHEN Qiang^{1, 2},
FEI Qingguo^{1, 2}

1.
School of Mechanical Engineering, Southeast University, Nanjing 211189, China
2.
Key Laboratory of Structure and Thermal Protection for High-Speed Aircraft, Ministry of Education, Nanjing 211189, China

Funds: National Natural Science Funds for Distinguished Young Scholar (52125209); Six Talent Peaks in Jiangsu Province (XCL-008)

摘要

摘要: 三维针刺SiO_2f/SiO₂复合材料是一种理想的耐高温透波材料，对其开展了600℃和800℃下的拉-拉疲劳试验和疲劳加载后的剩余强度拉伸试验，得到相应的应力-应变曲线。通过分析材料在不同循环次数下的滞回环形状和大小及模量随循环次数的变化规律，探究了三维针刺SiO_2f/SiO₂复合材料的高温拉-拉疲劳力学行为。结果表明：温度对三维针刺SiO_2f/SiO₂复合材料所承受的疲劳应力大小有很大影响，试件在600℃和800℃下表现出不同的疲劳性能；大部分试件的模量随循环次数的增加而逐渐下降，但出现部分试件的模量随着循环加载而波动变化。
- 三维针刺SiO_2f/SiO₂复合材料 /
- 高温拉-拉疲劳 /
- 模量退化 /
- 疲劳损伤 /
- 滞回环
Abstract: Three-dimensional needled SiO_2f/SiO₂ composite material is suitable for aircraft radome. Tensile fatigue tests at 600℃ and 800℃ and tensile tests after fatigue loading were carried out to obtain the stress-strain curves of the corresponding tests. By analyzing the shape and size of hysteresis loops under different cycles and the variation of stiffness with cycles, the tensile fatigue mechanical behavior of 3D needled SiO_2f/SiO₂ composites at high temperature was investigated. The results show that temperature has great influence on fatigue stress of 3D needled SiO_2f/SiO₂ composites, and the fatigue properties of the composites are different at 600℃ and 800℃. The modulus of most specimens decreases gradually with the increase of the number of cycles, but the modulus of some specimens fluctuates with the cyclic loading.
- three-dimensional needled SiO_2f/SiO₂ composites /
- high temperature tension fatigue /
- modulus degradation /
- fatigue damage /
- hysteresis loop

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图 1 SiO_2f/SiO₂复合材料拉伸疲劳试样外形尺寸和截面CT扫描图

Figure 1. Dimensions of tensile fatigue samples of SiO_2f/SiO₂ composite and cross section CT scan

h—Thickness of specimen

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图 2 SDS-100 电液伺服疲劳试验机

Figure 2. SDS-100 electro-hydraulic servo fatigue testing machine

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图 3 600℃和800℃下SiO_2f/SiO₂复合材料疲劳应力和寿命示意图

Figure 3. Diagram of fatigue stress and life of SiO_2f/SiO₂ composite at 600℃ and 800℃

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图 4 SiO_2f/SiO₂复合材料剩余强度应力-应变曲线

Figure 4. Residual strength stress-strain curves of SiO_2f/SiO₂ composite

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图 5 在600℃ (a)和800℃ (b)下SiO_2f/SiO₂复合材料试件滞回环曲线

Figure 5. Hysteretic loop curves of SiO_2f/SiO₂ composites at 600℃ (a) and 800℃ (b)

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图 6 疲劳损伤及模量退化示意图

E_n/E₀—Ratio of residual modulus to initial modulus; n/N—Ratio of the number of cycles to the final fatigue cycle

Figure 6. Schematic diagram of fatigue damage and modulus degradation

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图 7 SiO_2f/SiO₂复合材料在600℃ (a)和800℃ (b)下模量退化曲线

Figure 7. Modulus degradation curves of SiO_2f/SiO₂ composites at 600℃ (a) and 800℃ (b)

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图 8 600℃ (a)和800℃ (b)下SiO_2f/SiO₂复合材料试件模量试验值及拟合曲线

Figure 8. Life cycle modulus test value and fitting curves of SiO_2f/SiO₂ composites at 600℃ (a) and 800℃ (b)

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表 1 三维针刺SiO_2f/SiO₂复合材料性能

Table 1. Properties of three-dimensional needled SiO_2f/SiO₂ composites

Fiber volume fraction/vol%	Density / (g·cm⁻³)	Flexural strength/ MPa	Flexural elastic modulus/GPa
45	1.66	101.4	24.74

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表 2 SiO_2f/SiO₂复合材料试件疲劳性能数据

Table 2. Fatigue performance data of SiO_2f/SiO₂ composites

Specimen	Tempera- ture/℃	Fatigue stress/MPa	Cycles (n)	Initial modulus/ GPa
SiO_2f/SiO₂-S1	600	28.7	100000	22.8
SiO_2f/SiO₂-S2	600	28.9	100000	24.0
SiO_2f/SiO₂-S3	600	31.7	45504	27.0
SiO_2f/SiO₂-S4	600	35.9	1412	26.7
SiO_2f/SiO₂-S5	600	34.8	0	—
SiO_2f/SiO₂-S6	600	44.8	0	—
SiO_2f/SiO₂-E1	800	31.0	100000	35.0
SiO_2f/SiO₂-E2	800	33.0	3948	23.0
SiO_2f/SiO₂-E3	800	35.8	45599	24.7
SiO_2f/SiO₂-E4	800	36.0	100000	30.5
SiO_2f/SiO₂-E5	800	37.7	100000	30.0
SiO_2f/SiO₂-E6	800	38.6	100000	34.0
SiO_2f/SiO₂-E7	800	38.8	764	20.2

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表 3 SiO_2f/SiO₂复合材料试件模量退化模型拟合参数及拟合优度

Table 3. Fitting parameters and correlation coefficients of modulus degradation model for SiO_2f/SiO₂ composites

Test part number	Cycle n	E_rc/E₀	a	b	c	R²
SiO_2f/SiO₂-E4	100000	0.9675	4.8430	6.017	0.9865	0.9847
SiO_2f/SiO₂-E6	100000	0.9325	2.7800	1.824	0.4163	0.9874
SiO_2f/SiO₂-E2	3948	0.9255	0.5755	2.664	1.1100	0.9914
SiO_2f/SiO₂-S1	100000	0.9266	1.9970	12.090	0.5385	0.9754
SiO_2f/SiO₂-S2	100000	0.9066	2.0550	1.997	12.0900	0.8152
SiO_2f/SiO₂-S3	45504	0.9117	92.4200	3.581	0.5028	0.9616
SiO_2f/SiO₂-S4	1412	0.9617	2.1660	5.652	1.4870	0.9948
Notes: E_rc/E₀—Ratio of the critical residual modulus to the initial modulus; a, b, c—Model fitting parameters; R²—Correlation coefficients.

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