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1 Graduate School of Engineering Department of Mechanical Sciences & Engineering Materials Science & Mechanics Research Group Prof. K. Kishimoto Assoc. Prof. K. Inaba Assist. Prof. K. Takahashi Visualization and Measurement of Material Deformation, Modeling and Validation
2 Peeling behavior of adhesive materials Probe tack test Tack performance: peak load + energy (Load-displacement curve) Evaluation of thinner adhesive : Probe tack test, Peel test Peel test Liner guide Load cell Adhesive Adhesive Liner guide Adhesive tape Thick substrate Thin substrate
3 = y/d Time Capillary induced deformation Takahashi, Sugita, Oshima, Inaba, Kishimoto, Applied Physics Letters, 103, , (2013). Evaluation of micro-pillar array deformation by non-dimensional parameter calculated from macro scale experiments Tilted micropillar array : Semiconductor industry D. Chandra and S. Yang, Langmuir 2009, 25(18), = + + U U, h y Surface energy Potential energy Strain energy 2 3 h Ebw 2 U bh cos gb( d y) y 3 2 8l Static relation y *(1 y*) 2 ( cos ) 3 gd E 2 l w 3 K
4 Fluid-structure interaction (Water hammer) Evaluation of fluid-structure interaction parameter for various materials (steel, polymer, composite) and fluid conditions (water, water+gas, water+particles) cavitation shock Hamaoka NPP #1 ( ) H 2 +O 2 detonation normal Parallel shock Slamming of tanker Normal wave interaction Parallel wave interaction p 1 +Δp c h c f p 1 a p cu f Underwater explosion and cavitation dv M Ap t cv dt p p t P p p f P f c h 0 exp p c : water-hammer speed - Joukowsky (1898) c f : sound speed of water (1493 m/s) K: Bulk modulus of fluid E: Young s modulus of tube a: Radius of tube h: Thickness of tube wall
5 Fluid-structure interaction (Water hammer) Evaluation of fluid-structure interaction parameter for various materials (steel, polymer, composite) and fluid conditions (water, water+gas, water+particles) Classical theory of water hammer (Skalak, 1956) K: Bulk modulus of fluid E: Young s modulus of tube a: Radius of tube h: Thickness of tube wall Inaba, Shepherd, ASME J. Pressure Vessel Technology, Vol. 132, (2010), (Best paper in 2010) p0 = 0 hoop ρ c f V B p0a Eh p0 = 0 ρ c f V B long p0a Eh Mild Steel CFRP GFRP Bubbly liquid Supercritical CO 2 generation Ando et al., J. Fluid Mechanics, 671, (2011). Ushifusa et al., J. Supercritical Fluids, 94, ,(2014). Inaba, Shepherd ASME PVP2010 You, J. H., Inaba, K., J. Fluids & Structures, Vol. 36, (2013).
6 Cavitation erosion under tension Evaluation method for coating material in fluid machinery (for extension of life) Cavitation (high-speed video image) PC t1mm 23 kfps jpg jpg Damage of epoxy resin (EP) Testing device, ASMT G32 (half amp. 25 mm, 19.5 khz, 1 mm gap) Damage of Unsaturated Polyester resin (UP) 0 MPa, 28 h w/o tension 1.31 MPa 1.31 MPa 1.31 MPa 0.5 h 2 h 7.5 h will be presented in CAV2015 at EPFL, Hibi, Inaba, Takahashi, Kishimoto, Hayabusa 1.31 MPa, 2 m 35 s
7 Inverse analysis of impact load Monitoring system of fluid machinery from outside of pump casing Determination of optimal transfer function by mechanical pencils 30 AE sensor e t Specimen Known load f t e i t = Pencil lead (2H, Φ0.5 mm) H: Optimal transfer function 0 t h i t τ f τ dτ E = HF Fourier transform Estimation of load H + E c = F c Inverse Fourier transform f c t F c : Unknown impact load E c : AE sensor signal Load release by breaking pencil lead 5 N Water jet Bubble collapse and jet impact Φ0.4 mm, 40V, 35 kfps
8 Graduate School of Engineering Department of Mechanical Sciences & Engineering Materials Science & Mechanics Research Group Peeling behavior of adhesive materials Inverse analysis of jet impact load Prof. K. Kishimoto Water jet Water hammer Capillary induced deformation Assist. Prof. K. Takahashi Assoc. Prof. K. Inaba Cavitation erosion
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