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.

在本文中，设计和建造了一种新型的微拉伸测试装置来表征材料的微观力学行为。此外，还介绍了一种用于微型样品的特殊几何形状，可以解决与处理、夹持和对齐此类样品相关的问题。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，确定了增材印刷和压缩成型 ABS 的微机械响应。3D 打印的样品表现出比压缩成型样品更高的机械性能。数字图像相关 (DIC) 技术也应用于变形期间拍摄的光学图像，以测量微米级感兴趣区域中的应变场。DIC 结果显示，与整体样品相比，3D 打印样品的应变定位更加强烈。比较应力-应变曲线和 DIC 结果表明，该设备和技术在机械响应的原位表征。