Loading–Unloading Cycles of Three-Dimensional-Printed Built Bimaterial Structures With Ceramic and Elastomer
Loading–Unloading Cycles of Three-Dimensional-Printed Built Bimaterial Structures With Ceramic and Elastomer
复制标题
三维打印陶瓷和弹性体双材料结构的加载-卸载循环
DOI：
10.1115/1.4034668
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发表时间：
2017
影响因子：
4
通讯作者：
Bruce L. Tai
中科院分区：
文献类型：
--
作者：
Y. Kao;Ying Zhang;Jyhwen Wang;Bruce L. Tai
本文研究了一种由有机硅填充的开孔石膏框架构成的三维打印双材料结构的加卸载行为。石膏(陶瓷相)和有机硅(弹性体相)的组合被假设具有非线性弹性性质和更好的延展性。进行了四点弯曲试验，按程序设定了先前变形的循环次数。结果表明，当第一次弯曲挠度在2 mm左右时，存在线性-非线性转变。随着循环的进行，这种线性-非线性转变出现在前一个循环的最大挠度处；同时，弯曲刚度下降。人们认为，石膏框架内部微裂纹的出现是这一现象背后的机理。有机硅提供了一个强大的网络，抑制了脆性材料中的突然裂纹扩展。并比较了框架结构和石膏硅胶比的影响。高石膏含量和大单元尺寸往往具有较高的刚度和明显的线性-非线性转变，同时也有更显着的刚度退化。
This paper studies the loading–unloading behaviors of a three-dimensional (3D)-printing built bimaterial structure consisting of an open-cellular plaster frame filled with silicone. The combination of the plaster (ceramic phase) and silicone (elastomer phase) is hypothesized to possess a nonlinearly elastic property and a better ductility. Four-point bending tests with programmed cycles of preceding deformations were conducted. The results show that there exists a linear–nonlinear transition when the bending deflection is around 2 mm in the first cycle bending. As the cycle proceeds, this linear–nonlinear transition is found at the maximum deflection of the previous cycle; meanwhile, the bending stiffness degrades. It is believed that the occurrence of microcracks inside the plaster frame is the mechanism behind the phenomenon. The silicone provides a strong network suppressing the abrupt crack propagation in a brittle material. The effects of the frame structure and plaster–silicone ratio were also compared. A high plaster content and large cell size tend to have a higher stiffness and obvious linear to nonlinear transition while it also has more significant stiffness degradation.