Applied Modelling and Computation Group, Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.
Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.
Sci Rep. 2017 Apr 11;7:46190. doi: 10.1038/srep46190.
New engineered materials have critical applications in different fields in medicine, engineering and technology but their enhanced mechanical performances are significantly affected by the microstructural design and the sintering process used in their manufacture. This work introduces (i) a methodology for the calculation of the full deflection profile from video recordings of bending tests, (ii) an optimisation algorithm for the characterisation of Young's modulus, (iii) a quantification of the effects of optical distortions and (iv) a comparison with other standard tests. The results presented in this paper show the capabilities of this procedure to evaluate the Young's modulus of highly stiff materials with greater accuracy than previously possible with bending tests, by employing all the available information from the video recording of the tests. This methodology extends to this class of materials the possibility to evaluate both the elastic modulus and the tensile strength with a single mechanical test, without the need for other experimental tools.
新型工程材料在医学、工程和技术的不同领域有重要应用，但它们增强的机械性能受到微观结构设计和制造过程中使用的烧结工艺的显著影响。这项工作介绍了（i）一种从弯曲试验的视频记录中计算全挠度轮廓的方法，（ii）一种用于特征化杨氏模量的优化算法，（iii）一种对光学变形影响的量化，以及（iv）与其他标准试验的比较。本文介绍的结果表明，该方法能够比以前通过弯曲试验更精确地评估高刚性材料的杨氏模量，方法是利用试验视频记录中的所有可用信息。这种方法将评估弹性模量和拉伸强度的可能性扩展到了这一类材料，无需其他实验工具即可通过单次机械试验来完成。
