复合材料固化残余应变应变片原位检测方法

孟波; 孙小巍; 刘凯; 刘振东; 王鹏

复合材料固化残余应变应变片原位检测方法

孟波^{1, 2, 3},
孙小巍¹,
刘凯^{2, 3, ,},
刘振东^{2, 3},
王鹏⁴

1.
沈阳建筑大学　材料科学与工程学院, 沈阳110168
2.
北京理工大学　宇航学院, 北京100081
3.
北京理工大学　唐山研究院, 唐山 063000
4.
西安航天复合材料研究所, 西安 710038

基金项目: 重点实验室基金一般项目 (6142906220101)；国防基础科研计划资助(JCKY2021206A045)；国防基础科研计划资助 (JCKY2022206A010).

详细信息

通讯作者:
刘凯，博士，副教授，博士生导师，研究方向为复合材料工艺力学　E-mail: liukai0704@bit.edu.cn

中图分类号: TB332
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- 文章访问数: 83
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- 被引次数: 0
出版历程
- 收稿日期: 2024-03-06
- 修回日期: 2024-04-10
- 录用日期: 2024-04-21
- 网络出版日期: 2024-05-24

In-situ testing method for residual strain of cured composite materials

MENG Bo^{1, 2, 3},
SUN Xiaowei¹,
LIU Kai^{2, 3
, ,},
LIU Zhendong^{2, 3},
WANG Peng⁴

1.
School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
2.
School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100094, China
3.
Tangshan Research Institute, Beijing Institute of Technology, Tangshan, Hebei 063000, China
4.
Xi 'an Aerospace Composite Materials Research Institute,Xi 'an 710038, China

Funds: Key Laboratory Fund General Projects (6142906220101); Defense Industrial Technology Development Program (JCKY2021206A045); Defense Industrial Technology Development Program (JCKY2022206A010)

摘要

摘要: 复合材料固化残余应变是导致复合材料固化变形的主要原因，残余应变也会导致复合材料产生裂纹、分层等缺陷，影响复合材料构件装配与构件性能，因此，复合材料固化残余应变原位检测方法研究具有重要意义。本文建立了一种复合材料固化残余应变应变片原位检测方法，根据复合材料凝胶点将复合材料固化分橡胶态和玻璃态两个阶段，针对这两个阶段分段式处理应变片原位检测复合材料固化残余应变数据，对应变片原位检测数据分别采取去除应变片热膨胀和不去除热膨胀的处理方法。基于分段式处理方法，测试了碳纤维热固性复合材料真空袋固化成型0°和90°方向上的应变变化，并与光纤光栅(FBG)原位检测结果进行对比分析，揭示了复合材料固化残余应变的形成机理。研究结果表明，应变片原位检测数据分段式处理结果与FBG结果基本吻合，可以有效分析复合材料固化过程残余应变的演化规律。
- 碳纤维增强复合材料 /
- 固化残余应变 /
- 原位检测 /
- 应变片 /
- 光纤光栅
Abstract: During the curing process of composites, residual strain will inevitably occur, which will change continuously with the curing of composites, and residual strain is the main reason leading to the final curing deformation of materials. The concentration of residual strain may cause cracks and lamination of composites, which will bring difficulties to the assembly of composite components and affect the performance of components. It is of great significance to study the in-situ detection method of curing residual strain of composites. In this study, a strain gauge in-situ detection method for curing residual strain of composites is established, and a piece-wise curing residual stress and strain gauge data processing method is proposed. The curing of composites is divided into two stages at the gel point of composites. For these two stages, different processing methods are adopted for in-situ strain gauge detection data. The strain changes in the direction of 0° and 90° were measured and compared with the results of fiber Bragg grating (FBG) in situ, which revealed the formation mechanism of the cured residual strain of the composite. The results show that the piece-wise processing of in-situ strain gauge data is basically consistent with the results of FBG, which can effectively analyze the evolution law of residual strain during solidification of composites.
- Carbon fiber reinforced composite /
- Curing residual strain /
- In-situ test /
- strain gage /
- Fiber Bragg grating

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图 1 应变片温度热输出曲线

Figure 1. Temperature thermal output curve of strain gauge

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图 2 预浸料粘度-温度曲线

Figure 2. Viscosity and temperature curve of prep-reg

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图 3 固化系统、复合材料及烘箱温度

Figure 3. Curing system, composite material and oven temperature

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图 4 传感器的铺设位置

Figure 4. Laying position of the sensor

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图 5 FBG检测复合材料固化过程中应变结果

Figure 5. The strain results of the composite during solidification were measured by FBG in-situ

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图 6 去除温度影响前应变片检测结果

Figure 6. The influence of temperature on the strain gauge was removed

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图 7 去除温度影响后应变片检测不分阶段处理结果

Figure 7. After removing the influence of temperature, the measured data of strain gauge are processed regardless of stage

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图 8 去除温度影响后应变片检测数据分阶段处理结果

Figure 8. After removing the influence of temperature, the measured data of strain gauge are processed in stages

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表 1 应变片参数

Table 1. Resistance strain gauge parameters

Type	Maximum service temperature/℃	Strain sensitivity coefficient	Gridarea/ mm	Rsistance/ Ω
BA120-3AA	250	2.1±0.01	3×2	120

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表 2 FBG传感器参数

Table 2. Parameters of FBG sensor

Parameters	Values
Grating length Ls	10 mm
Initial Bragg grating period λ_B	1540 nm~1552 nm
Coefficient of axial strain Sensitivity S_ε	1.174 pm/με
Coefficient of temperature Sensitivity S_T	11.033 pm/℃

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表 3 应变片及FBG检测结果100℃~45℃降温段应变变化比较

Table 3. Comparison of strain change results measured by strain gauge and FBG in 100℃~45℃ cooling section

Checking angle	FBG-Experiment-1	FBG-Experiment-2	Average	Strain gage-Experiment-1	Strain gage-Experiment-2	Average
0°	32.4	33.2	32.8	36.7	37.3	37
90°	−1903.1	−2030	−1966.5	−1900	−2172.2	−2036.1

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