Characterisation of mechanical behaviour of 3D printed rock-like material with digital image correlation

摘要: Abstract In this study, 3D printing technology was used to prepare rock-like specimens containing different flaw configurations. particular, printed Brazilian disc with pre-existing single and double flaws were compressed under quasi-static loading investigate the capacity as well crack initiation, propagation coalescence mechanism of pre-flawed specimens. For first time, coupled digital image correlation (DIC) analysis systematically study behaviour flawed experiments, DIC technique calibrated validated via compressive test on a cylindrical specimen three-point bending notched semicircular specimen, then for comprehensive deformation failure discs loading. It revealed that results are dependent more significantly subset size than spacing. The experiments showed material not only can produce mechanical properties similar natural brittle rock but also has advantages such homogeneity , high geometry flexibility, easy pre-flaw implementation quickness in prototyping. shown method is capable accurately capturing initiation multiple cracks their direction types. On other hand, it configuration had significant effect type cracks. tensile or shear movement controls new be formed direction. Moreover, dominant double-flawed loading, while hard appear.