基于数字图像相关法的多尺度全场应变测量方法

杜昊; 王荣桥; 赵炎; 郭婧; 胡殿印

doi:10.13224/j.cnki.jasp.20240735

基于数字图像相关法的多尺度全场应变测量方法

doi: 10.13224/j.cnki.jasp.20240735

杜昊^1,,
王荣桥^{1, 2},
赵炎^{1, 2,*, ,},
郭婧³,
胡殿印^{2, 4, 5}

1.
北京航空航天大学能源与动力工程学院，北京 100191
2.
北京航空航天大学航空发动机结构强度北京市重点实验室，北京 100191
3.
中国航发湖南动力机械研究所，湖南株洲 412002
4.
北京航空航天大学航空发动机研究院，北京 100191
5.
中小型航空发动机联合研究中心，北京 100191

基金项目: 基础研究计划资助（JCKY2021601B204）

详细信息

作者简介:
杜昊（1999-），男，硕士生，主要研究方向为航空发动机结构强度及高温力学测量。E-mail：DH2204120@buaa.edu.cn

通讯作者:
赵炎（1997-），男，助理研究员，博士，主要研究方向为航空发动机结构健康监测与高温力学测量。E-mail：zy_buaa@buaa.edu.cn

中图分类号: V250.2；O348.1
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出版历程
- 收稿日期: 2024-10-27
- 网络出版日期: 2025-01-07

Multi-scale full-field strain measurement method based on digital image correlation method

DU Hao^1
,,
WANG Rongqiao^{1, 2},
ZHAO Yan^{1, 2,*
, ,},
GUO Jing³,
HU Dianyin^{2, 4, 5}

1.
School of Energy and Power Engineering，Beihang University，Beijing 100191，China
2.
Beijing Key Laboratory of Aero-Engine Structure and Strength，Beihang University，Beijing 100191，China
3.
Hunan Aviation Powerplant Research Institute，Aero Engine Corporation of China，Zhuzhou Hunan 412002，China
4.
Research Institute of Aero-Engine，Beihang University，Beijing 100191，China
5.
United Research Center of Mid-Small Aero-Engine，Beijing 100191，China

摘要

摘要:
为了实现不同尺度下的应变测量，开展了基于数字图像相关法（digital image correlation，DIC）的多尺度全场应变测量研究。发展了一种多层次散斑制备方法，通过数值模拟试验验证了散斑质量；通过楔形面模型对离面位移进行了量化，提出了基于透镜成像模型的虚假应变矫正方法；通过相关试验对离面位移计算方法和虚假应变矫正方法进行了验证。研究结果表明：离面位移计算方法的平均误差小于4.20%；相比于传统DIC方法，采用虚假应变矫正算法后的应变测量精度提高了8.16%以上，实现了多尺度全场应变的高精度测量。
- 数字图像相关法 /
- 应变测量 /
- 多尺度散斑 /
- 离面位移 /
- 虚假应变矫正
Abstract:
To realize strain measurement accuracy at different scales, a multi-scale full-field strain measurement method based on digital image correlation (DIC) was proposed. A multilayer speckle preparation method was developed, and the quality of speckle was verified by numerical simulation test. The out-of-plane displacement was quantified by wedge plane model, and a false strain correction method based on lens imaging model was proposed. The calculation methods of out-of-plane displacement and the method of false strain correction were verified by relevant experiments. The results indicated that the average error of the surface displacement calculation method was less than 4.20%; compared with the traditional DIC method, the accuracy of strain measurement by using the false strain correction algorithm was improved by more than 8.16%, achieving high-precision measurement of multiscale full-field strain.
- digital image correlation /
- strain measurement /
- multi-scale speckle /
- out of plane displacement /
- spurious strain correction

HTML

图 1 多尺度散斑图

Figure 1. Multi-scale speckle pattern

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图 2 散斑移动计算结果

Figure 2. Speckle movement calculation results

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图 3 楔形面模型示意图

Figure 3. Schematic diagram of wedge face model

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图 4 离面位移透镜成像模型

Figure 4. Out-of-plane displacement lens imaging model

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图 5 试样示意图（单位: mm）

Figure 5. Schematic diagram of the test piece （unit: mm）

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图 6 基于DIC的试验平台

Figure 6. Test platform based on DIC

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图 7 不同尺度下散斑图像及晶粒尺寸对比

Figure 7. Speckle images and grain size comparison at multi-scales

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图 8 离面位移计算结果频数分布直方图

Figure 8. Histogram of frequency distribution of out-of-plane displacement calculation results

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图 9 不同尺度拉伸过程应变云图

Figure 9. Strain clouds of stretching processes at different scales

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图 10 计算结果平均值与理论解对比

Figure 10. Average of the calculation results is compared with the theoretical solution

下载: 全尺寸图片幻灯片

表 1 304不锈钢材料参数

Table 1. Material parameters of 304 stainless steel

参数	数值及详情
材料	304不锈钢
抗拉强度σ_b/MPa	673
屈服强度σ_0.2/MPa	283
弹性模量E/GPa	140.55
泊松比ν	0.30

下载: 导出CSV

表 2 矫正前后误差对比表

Table 2. Comparison of errors before and after correction

参数		载荷水平/N
参数		100	200	300	400	500	600	700	800	900	1000	平均
宏观尺度	矫正前误差/%	15.88	19.74	21.37	17.29	21.77	21.75	21.62	17.86	19.03	16.42	19.27
	矫正后误差/%	0.94	0.78	1.89	1.53	1.80	0.48	3.23	2.46	5.08	9.05	2.73
	精度提高/%	14.93	18.96	19.49	15.76	19.97	21.27	18.40	15.39	13.94	7.37	16.55
细观尺度	矫正前误差/%	10.94	13.19	10.45	9.25	14.35	16.31	20.77	19.39	19.91	25.80	16.04
	矫正后误差/%	4.48	1.07	2.61	2.25	5.19	4.85	15.40	13.75	13.34	15.77	7.87
	精度提高/%	6.46	12.13	7.84	7.00	9.16	11.46	5.37	5.64	6.57	10.03	8.16
微观尺度	矫正前误差/%	10.61	22.56	23.87	25.65	27.06	24.62	22.88	23.82	25.12	24.86	23.11
	矫正后误差/%	2.74	0.46	3.91	1.30	1.71	15.82	8.96	16.21	16.29	16.45	8.39
	精度提高/%	7.87	22.10	19.96	24.36	25.34	8.80	13.92	7.61	8.83	8.41	14.72

下载: 导出CSV

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