The layer-by-layer nature of 3D printing processes can lead to materials that possess highly anisotropic strength and fracture toughness. In particular, the interfaces generated from successive deposition inherent in this manufacturing technique create a real challenge for the scientific community to produce components with comparable strength to conventionally manufactured components. This is especially difficult when components are loaded in a direction perpendicular to the deposition interfaces. Presented are results from a systematic investigation which evaluates how the interfaces resulting from deposition affect the fracture response and overall toughness of the material. Fracture studies are conducted both perpendicular and parallel to the deposition interfaces using a specially designed test method that allows for observations of the fracture process at the deposition interface length scale. The method utilizes a composite double cantilever beam test geometry combined with a controlled displacement loading device that applies load to the sample using a wedge driven directly into the crack. Results highlighting the anisotropic nature of the fracture process, which stems from manufacturing, will be presented. A commercially available acrylic stereolithography resin, Formlab’s Clear V2, printed in the Form 2 printer with its 405nm laser, was selected for study due to its commercial relevance. In addition, the effects of printing parameters (e.g. layer thickness) will be discussed.

Fracture toughness anisotropy resulting from 3D printing processes

254th National Meeting (2017)

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