Bhaskar Lalith Kumar, Kumar Gobind, Srinivasan Nedunchezhian, Kumar Ravi
Laboratory for High Performance Ceramics, Department of Metallurgical and Materials, Engineering, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India.
Rev Sci Instrum. 2021 Jan 1;92(1):015116. doi: 10.1063/5.0031805.
In this work, a novel stand-alone multi-axial loading test setup was developed to test miniature samples under uniaxial tension, uniaxial compression, in-plane biaxial tension, and biaxial compression stress states. Good agreement in stress-strain responses was observed between the uniaxial experiments carried out using the miniature sample geometry in the custom-built setup and the uniaxial standard geometry in a universal testing machine. With regard to biaxial experiments, the full-field strain captured using digital image correlation for the biaxial specimens revealed strain homogeneity in the central gage section of the sample. Furthermore, the in situ capability of the setup was demonstrated by integrating it with a commercial laboratory x-ray diffractometer, and good agreement was found between the calculated stress values from the load sensor and the stress obtained using x-ray diffraction.
在这项工作中，开发了一种新型的独立多轴加载试验装置，用于在单轴拉伸、单轴压缩、面内双轴拉伸和双轴压缩应力状态下测试微型样品。在定制装置中使用微型样品几何形状进行的单轴实验与万能试验机中的单轴标准几何形状实验之间，观察到应力-应变响应具有良好的一致性。关于双轴实验，使用数字图像相关技术对双轴试样捕获的全场应变显示出样品中央应变片区域的应变均匀性。此外，通过将该装置与商业实验室X射线衍射仪集成，展示了其原位能力，并且在负载传感器计算出的应力值与使用X射线衍射获得的应力之间发现了良好的一致性。
