ABSTRACT:

Rock dynamics attracts great attention in rock mechanics. However, specimen preparation in experimental study is not easy. 3D printing started to be involved to improve this process, Including Polylactic Acid (PLA) and resin. However, their plastic behavior is much unlike brittle rock. In this work, a gypsum-like power material using inkjet 3D printing (3DP) technique was applied to produce pre-cracked specimens for dynamic Split Hopkinson Pressure Bar (SHPB) test. High speed camera observed that the failure pattern of this material is similar to brittle rock-like material such as Portland Cement Concrete (PCC). Our results indicate that sample preparation by 3D printing will make far more contributions to rock dynamics because it is highly competitive due to its quickness in prototyping, precision and flexibility on the geometry, and high material homogeneity.

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