Because the fracture behaviors of soft materials are complex, high-precision technology is needed to perform the detailed analysis necessary to produce more effective materials. Indentation methods exist to characterize the fracture behavior of soft materials, with fractures varying in accordance with the shape of the indenter. Thus, it is important to clarify the relationship between indenter shape and the fracture behaviors of soft materials, and necessary to consider the complicated deformation patterns induced by the mechanical nonlinearity of the materials. To this end, various needle-like indenter shapes are modeled via a finite element method (FEM). In this study, we employ a cone-shaped reference needle. Then, the shape is changed to have the tip form a curvilinear indentation, resembling a steep mountain ridgeline. In addition, shear strain is set as the fracture criterion for soft material in the FE analysis since the shear force resulting from penetration primarily damages the soft materials. Regarding the force applied to the needle, there is a tendency for the force to become smaller as it more resembles a cone shape. There are three fracture types: holing, opening, and slitting. Holing is generated by the cone needle, and the fracture of soft material appears along the shape of the needle. Opening fractures are generated by the needle with a curvilinearly spreading tip, forming a small slit on the surface of the soft material. Lastly, slitting fractures are also generated by the needle with a curvilinearly spreading tip, but the resulting slit is deepened without damaging the tissue surrounding the needling. These fracture types can also be classified according to the fracture area of the soft material surface, with slitting resulting in the smallest fracture area.
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ASME 2018 International Mechanical Engineering Congress and Exposition
November 9–15, 2018
Pittsburgh, Pennsylvania, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5202-6
PROCEEDINGS PAPER
Evaluation of Soft Material Fracture Behavior via Indentation Testing With a Needle-Like Indenter
Takayuki Ishino,
Takayuki Ishino
Kyoto Institute of Technology, Kyoto, Japan
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Atsushi Sakuma
Atsushi Sakuma
Kyoto Institute of Technology, Kyoto, Japan
Search for other works by this author on:
Takayuki Ishino
Kyoto Institute of Technology, Kyoto, Japan
Atsushi Sakuma
Kyoto Institute of Technology, Kyoto, Japan
Paper No:
IMECE2018-87199, V003T04A051; 8 pages
Published Online:
January 15, 2019
Citation
Ishino, T, & Sakuma, A. "Evaluation of Soft Material Fracture Behavior via Indentation Testing With a Needle-Like Indenter." Proceedings of the ASME 2018 International Mechanical Engineering Congress and Exposition. Volume 3: Biomedical and Biotechnology Engineering. Pittsburgh, Pennsylvania, USA. November 9–15, 2018. V003T04A051. ASME. https://doi.org/10.1115/IMECE2018-87199
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