Mode-I fracture behavior of a shear-thickening fluid as adhesive layer under different loading rates
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This study characterizes the fracture behavior of a shear-thickening fluid (STF) with 58 vol% dispersion of styrene/acrylate particles in ethylene glycol. Double-cantilever-beam specimens with the STF as adhesive layer were utilized to characterize the mode-I fracture energy of the fluid with fluid thickness varying from 0.2 to 2.05 mm, and crack opening displacement rates from 1 to 50 mm/s. It was found that the deformation behavior of the STF was rate sensitive. In particular, liquid–solid transition could occur by increasing the loading rate and/or decreasing the fluid thickness. As confirmed by the high-speed video recording, the STF showed a “solid” behavior, fracturing with crack growth in a brittle manner when the displacement rate was greater than 30 mm/s. Thus, the average mode-I fracture energy of the fluid could be determined. It is interesting to note that the measured G c of the “solidified” STF was almost constant at ~230 J/m2, which is comparable to a low cross-linked epoxy. The results demonstrate that the deformation behavior of the STF in solid phase can be characterized by the standard test method following classic fracture mechanics. The measured fracture toughness can be used as an effective parameter showing the crack resistance or the energy-absorbing capacity of the STF in the solid phase.
KeywordsCrack Growth Rate Fracture Energy Displacement Rate Critical Shear Rate Normal Strain Rate
The authors acknowledge BASF AG (Germany) for providing the material. The authors thank Trevor Shearing for his technical assistance and advice to carry out our test program. The project was partly supported by a University of Sydney Bridging Support Grant (Dr. Li Chang). M. Tabassum is grateful for an Australian Postgraduate Award (APA) and a Peter Nicol Russell (PNR) for a top-up scholarship from the School of Aerospace, Mechanical & Mechatronic Engineering, the University of Sydney.
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