Design and manufacture of a micro-tensile testing machine for in situ optical observation and DIC analysis: application to 3D-printed and compression-molded ABS
Design and manufacture of a micro-tensile testing machine for in situ optical observation and DIC analysis: application to 3D-printed and compression-molded ABS
复制标题
用于原位光学观察和 DIC 分析的微拉伸试验机的设计和制造：在 3D 打印和模压 ABS 中的应用
DOI：
10.1088/1361-6439/abeaea
复制
发表时间：
2021
影响因子：
2.3
通讯作者：
M. Karimpour
中科院分区：
文献类型：
--
作者：
Sina Nazari;A. Sadeghi;M. Karimpour
本文设计并建立了一种新型的微拉伸试验装置，用于表征材料的细观力学行为。此外，一个特殊的几何形状的微型标本介绍，可以方便有关的处理，夹持和对齐这样的标本的问题。该装置可以与光学显微镜集成，以观察变形过程中发生的微观结构演变。使用开发的系统，增材印刷和压缩成型ABS的微观力学响应进行了测定。3D打印的样品表现出比压缩成型的样品更高的机械性能。数字图像相关（DIC）技术也被应用到变形过程中拍摄的光学图像，以测量在微米级的感兴趣区域的应变场。DIC结果显示，与整体样品相比，3D打印样品的应变局部化更强烈。比较应力-应变曲线和DIC结果表明，该装置和技术是相当成功的力学响应的原位表征。
In this paper, a novel micro-tensile testing apparatus is designed and built to characterize the micromechanical behavior of materials. Furthermore, a special geometry for micro specimens is introduced that could facilitate problems related to the handling, gripping, and aligning such specimens. The device can be integrated with an optical microscope to observe the microstructural evolution taking place during deformation. Using the developed system, the micromechanical response of additively-printed and compression-molded ABS was determined. 3D-printed specimens demonstrated higher mechanical properties over the compression-molded specimens. Digital image correlation (DIC) technique was also applied to the optical images taken during deformation to measure the strain field in a micron-sized area of interest. DIC results revealed a more intense strain localization for the 3D-printed specimen compared to the monolithic sample. Comparing stress–strain curves and DIC results indicate that the apparatus and technique were quite successful in the in situ characterization of mechanical response.