Mapping internal deformation fields in 3D printed porous structure with digital volume correlation
Mapping internal deformation fields in 3D printed porous structure with digital volume correlation
复制标题
利用数字体积相关性绘制 3D 打印多孔结构的内部变形场
DOI：
10.1016/j.polymertesting.2019.105945
复制
发表时间：
2019-09-01
期刊：
影响因子：
5.1
通讯作者：
Pan, Bing
中科院分区：
文献类型：
--
作者：
Wang, Bo;Sun, Lijuan;Pan, Bing
3D打印作为一种新兴的制造技术，正逐渐引起学术界和工业界的广泛关注。为了充分发挥其在工程应用中的潜力，有必要对3D打印材料和结构在外载荷作用下的力学行为和性能进行表征。虽然3D打印材料的表面变形已经得到了广泛的研究，但利用数字体积相关（DVC）进行三维内部变形测量和进一步的力学分析在3D打印领域受到的关注较少。在这项工作中，首先结合原位x射线计算机断层扫描（CT）成像，对3D打印多孔结构进行了分步单轴压缩测试。然后，利用DVC技术对不同压缩阶段的内部全场变形进行了全局和局部演化分析。最后，提出了一个多尺度实验框架，将3D打印多孔结构的力学性能与几何结构联系起来。在此基础上，对其破坏模式及可能的损伤机制进行了预测和讨论。
As a new manufacturing technology, 3D printing is gradually attracting more interest in both the academic community and the industrial field. To realize its full potential in engineering applications, it is necessary to characterize the mechanical behaviors and properties of 3D printed materials and structures under external loading. Although surface deformation of 3D printed materials has been extensively investigated, the 3D internal deformation measurement and further mechanical analysis using digital volume correlation (DVC) gain less attention in the field of 3D printing. In this work, step-wise uniaxial compression tests of a 3D printed porous structure were first performed in combination with in-situ X-ray computed tomography (CT) imaging. Then, the global and local evolutions of internal full-field deformation at different compressive stages were evaluated via DVC technique. Finally, a multiscale experimental framework was presented to correlate mechanical properties with geometric structure of the 3D printed porous structure. On this basis, the failure patterns along with the possible damage mechanism were predicted and discussed.