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 哈尔滨工程大学学报  2019, Vol. 40 Issue (7): 1340-1346  DOI: 10.11990/jheu.201802008 0

### 引用本文

LI Hailian, ZHAO Hongwei, LUO Chunyang, et al. Design and testing of in situ test instrument under combined biaxial tensile-bending load[J]. Journal of Harbin Engineering University, 2019, 40(7), 1340-1346. DOI: 10.11990/jheu.201802008.

### 文章历史

1. 北华大学 机械工程学院, 吉林 吉林 132021;
2. 吉林大学 机械与航空航天工程学院, 吉林 长春 130025

Design and testing of in situ test instrument under combined biaxial tensile-bending load
LI Hailian 1, ZHAO Hongwei 2, LUO Chunyang 1, ZHANG He 2
1. College of Mechanical Engineering, Beihua University, Jilin 132021, China;
2. School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Abstract: To study the micromechanical properties of materials and their products under approximate working conditions, this paper proposes an in situ test instrument with biaxial tensile-bending micromechanical properties under combined loading mode. The instrument design is based on the analysis of the functional principle of the micromechanical properties of materials under tensile-bending combined loading mode. To verify the rationality of the design, the finite element simulation method was used to analyze the static and dynamic characteristics of the proposed instrument. A prototype instrument was fabricated, and biaxial tensile tests under different pre-bending loads were conducted on typical materials using the proposed instrument. The experimental results indicate that the test device and method can test properties of a certain material under biaxial tensile and bending combined loads. Meanwhile, the corresponding test curves were obtained. The test was performed in real time using a high-power microscope, and the failure mechanism of the test piece was studied from a microscopic point of view. It provides a test basis for the study of mechanical properties of board and shell materials.
Keywords: combined load    biaxial tensile    bending    test instrument    finite element simulation    in situ test    microstructure    crack formation

1 测试仪器的理论基础 1.1 拉伸-弯曲复合加载原理

 $\varepsilon_{b}=\frac{L_{b}-L_{0}}{L_{0}} \times 100 \%$

 $f_{E}=\frac{F_{b} L_{0}^{3}}{12 E I}+\frac{4 F_{t} L_{0}}{E A}$

1.2 试件结构形式

2 测试仪机械加载装置设计

 Download: 图 3 机械加载装置结构 Fig. 3 The overall structure of the test device
2.1 双轴拉伸单元

2.2 弯曲单元

2.3 夹持单元

3 机械加载装置静动态特性分析 3.1 整机的静力学分析

3.2 整机的模态分析

 Download: 图 8 前六阶模态 Fig. 8 Diagram of the former six-order modal

4 系统集成与调试

 Download: 图 10 关节臂式三坐标辅助装配 Fig. 10 Theassembly diagram of articulation arm three-coordinate auxiliary

5 典型材料力学试验