NDLI: Investigation of Dynamic Crack Coalescence Using a Gypsum-Like 3D Printing Material

Content Provider	Springer Nature Link
Author	Jiang, Chao Zhao, Gao Feng Zhu, Jianbo Zhao, Yi Xin Shen, Luming
Copyright Year	2016
Abstract	Dynamic crack coalescence attracts great attention in rock mechanics. However, specimen preparation in experimental study is a time-consuming and difficult procedure. In this work, a gypsum-like material by powder bed and inkjet 3D printing technique was applied to produce specimens with preset cracks for split Hopkinson pressure bar (SHPB) test. From micro X-ray CT test, it was found that the 3D printing technique could successfully prepare specimens that contain preset cracks with width of 0.2 mm. Basic mechanical properties of the 3D printing material, i.e., the elastic modulus, the Poisson’s ratio, the density, the compressive strength, the indirect tensile strength, and the fracture toughness, were obtained and reported. Unlike 3D printed specimens using polylactic acid, these gypsum-like specimens can produce failure patterns much closer to those observed in classical rock mechanical tests. Finally, the dynamic crack coalescence of the 3D printed specimens with preset cracks were captured using a high-speed camera during SHPB tests. Failure patterns of these 3D printed specimens are similar to the specimens made by Portland cement concrete. Our results indicate that sample preparation by 3D printing is highly competitive due to its quickness in prototyping, precision and flexibility on the geometry, and high material homogeneity.
Starting Page	3983
Ending Page	3998
Page Count	16
File Format	PDF
ISSN	07232632
Journal	Rock Mechanics and Rock Engineering
Volume Number	49
Issue Number	10
e-ISSN	1434453X
Language	English
Publisher	Springer Vienna
Publisher Date	2016-04-06
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	3D printing Crack coalescence X-ray CT Split Hopkinson pressure bar High-speed camera Geophysics/Geodesy Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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