基于不同后处理方法的砂型3D打印类岩石试样力学性能研究

Mechanical properties of sand 3D printed rock-like samples based on different post-processing methods

3D打印技术作为一种快速成型技术在岩石室内试验中有着极大的应用潜力,但3D打印试样的低强度、低刚度一直是亟待解决的关键问题之一。为了能够找到提高3D打印类岩石试样强度、刚度的方法,选用GS19砂和呋喃树脂为打印材料,以砂型3D打印类岩石试样为研究对象,在此基础上采用3种后处理方法(真空渗入、低温处理以及渗入低温相结合)分别对试样进行后处理,对经后处理的砂型3D打印类岩石试样开展单轴压缩试验以研究其力学性能,并结合扫描电镜从微观层面分析了力学性能变化的原因。研究表明:不同后处理方法会改变试样的力学性能,其中渗入、低温相结合的方法对试样的强度和刚度提高最为显著,这与试样内部胶结状态发生变化相关。研究结果可为今后3D打印技术在岩石试验中的应用提供新的研究思路。

3D printing,a rapid prototyping technology,has great potential for applications in laboratory rock tests,but the low strength and stiffness of 3D printed samples have been one of the key problems that need to be addressed.In order to find a way to enhance the strength and stiffness of 3D printed rock-like samples,GS19 sand and furan resin were selected as printing materials,and sand 3D printed rock-like samples were used as research objects.Based on this,the samples were post-processed using three different methods:vacuum infiltration,low-temperature treatment,and combination of infiltration and low-temperature.Uniaxial compression tests were carried out on these post-processed sand 3D printed rock-like samples to study their mechanical properties,and the reasons for changes in mechanical properties were analyzed at a microscopic level by scanning electron microscopy.The results indicated that different post-processing methods can change the mechanical properties of the samples,and the combination of infiltration and low temperature can significantly enhance the strength and stiffness of samples,which is related to change in the internal cementation state of samples.The findings of the study can provide new research ideas for future application of 3D printing technology in rock testing.