Strength of Materials Lab. of Hokudai

- Engineering, Hokkaido University, room A5-21, Sapporo city, 060-8628 JAPAN

Exprerimental, theoretical and computational study on the constitutive law of deformable solids

Teaching

Notice for students is given here in Japanese:

Members

• Hiroyuki Kato, associate professor, hkatoATeng.hokudai.ac.jp  Tel. 81.11.706.6365
• D.Mizuno, R.Takahashi, S.Torii, K.Watanabe : Master 2
• T.Kiuchi, T.Nakatani, J.Kawakami, H.Wakatake :Master 1
• K.Asano, H.Suzuki, Y.Shimizu, R.Kukutsu: Bachelor 4

Prof. Kazuaki Sasaki retired from Hokudai this spring. The Labo's alumni party was held on Sat. 11th of this March. The pictures are here: http://mech-hm.eng.hokudai.ac.jp/~sm/OB

The latest presentation/publication

• Shape Memory Effect and Superelasticity of Textured NiTi Alloy Wires, H.Kato, S.Fukushima and K.Sasaki, in Advances in Shape Memory Materials, ed. QP.Sun, R.Matsui, K.Takeda, EA.Pieczyska, Springer (2017), p.43-50.

• Energetics of functional fatigue in superelastic NiTi alloy, H.Kato, T.Kiuchi and K.Sasaki, proceeding of International Workshop on Advances in Shape Memory Materials, March 27-28, 2017 Nagoya Japan. pp.39-40.

Field of my interest

• Instability of solids during deformation
• Role of lattice defects for the mechanical behavior of crystals
• Sensing technology of surface geometry

Research Objectives 2017

• Kinetics of the collective motion of particles (sand and snow)
• Beveling method in contact mechanics/ Sensing by finger touch
• BEM analysis of dislocation and disclination
• Disclination in the scaling problem of microstructures

• Taylor problem of textured polycrystal NiTi SMA
• Stephan problem of the heat conduction during solid-solid phase change in SMA
• Phase field of the D'lambert solution for moving boundary in SMA
• Auto-catalysis in the functional fatigue in NiTi SMA
• Micro NiTi SMA wires

Master degree thesis 2017-2018

• Size dependence of micro indentation hardness/ exp and ANSYS/ Takahashi
• Flow of sand and snow as the collective motion of particles/ computation/ Nakatani
• Breakage of baseball bats/ FEM/ Kawakami
• Elastic strain field of disclination dipole/ BEM/ Torii
• Phase field modeling of martensitic tranformation in SMA / computation/ Mizuno
• Finger sensing of unkown objects beneath the skin/ ANSYS/ Watanabe and Wakatake
• Heat conduction during pulse heating of SMA wires/ exp and computation/ Kiuchi

Backgrounds:

• Micromechanics [1]/ Disclination [2]/ Creep [3]/ Thermodynamics [4]/ Variational principle [5]　/ etc.
• Single crystals [6-8]/ Structure materials (Steels [9,10], Al, Mg [11])/ Powder metallurgy[12,13] / etc.

1. Martensite Structure in Polycrystalline Fe-Pd, H.Kato, T.Wada, Y.Liang, M.Taya, T.Mori, Material Science and Engineering-A, 332/1-2, 2002, 134-139.
2. Disclination model applied to elastic incompatibility at grain boundary triple line, T.Hosoya, H.Kato, K.Sasaki, Transaction of the JSME, 2015, Vol.81, No.830.
3. High Temperature Plasticity of the beta-phase in Nearly-Equiatomic Nickel-Titanium Alloys, H.Kato, T.Yamamoto, S.Hashimoto and S.Miura, Materials Transactions, JIM, Vol.40, 1999, 343-350.
4. Clausius–Duhem inequality description of superelasticity in Ni–Ti polycrystal as a dissipative process, Y. Yasuda, H. Kato, K. Sasaki, Scripta Materialia, 2012, Vol.66, pp. 939–942.
5. Phenomenological model of variant change during magnetization of martensite, H.Kato, K.Sasaki, Philosophical Magazine Letters, Vol.84, No.5, 2004, 283-291.
6. Effect of Aging on Pseudoelastic Behaviour in Cu-15.0at.%Sn Alloy Single Crystals, H.Kato, N.Hirata, S.Miura, Acta Metallurgica et Materialia,Vol.43, 1995, p.361-369.
7. Superelasticity and Shape Memory Effect in Cu-23at.%Al-7at.%Mn Alloy Single Crystal, H.Kato, J.Dutkiewicz and S.Miura, Acta Metallurgica et Materialia, Vol.42, 1994, p.135
8. Microstructural Aspect of the FCC to FCT transformation During Deformation in gamma-Mn Cu Alloy Single Crystals,H.Kato and S.Miura, Philosophical Magazine A, Vol.71, 1995, 781-803.
9. Back stress work hardening confirmed by Bauschinger effect in a TRIP steel using bending tests, H. Kato, R.Moat, T. Mori, K.Sasaki, PJ Withers, ISIJ International, 2014, Vol. 54, No.7, 1715-1718.
10. Four-point bending test of the Bauschinger effect in prestrained IF steel thin sheet, H. Kato, K. Sasaki, T. Mori, Materials Science & Engineering A, 2015, 642, p.150-156.
11. Four-point bending test of determining stress-strain curves asymmetric between tension and compression, H. Kato, Yutaka Tottori, K. Sasaki, Experimental Mechanics, 2014, 54, 489–492.
12. Stress-strain Behavior and Shape Memory Effect in Powder Metallurgy TiNi Alloys, H.Kato, T.Koyari, M.Tokizane and S.Miura, Acta Metallurgica et Materialia, Vol.42, 1994, p.1351.
13. Martensitic transformation and microstructure of Ti-rich Ti–Ni as-atomized powders, T.Yamamoto, H.Kato,Y.Murakami, H.Kimura, A.Inoue, Acta Materialia, 56, 2008, 5927-5937.

and more.

HK thanks to co-authors:

Sei Miura, prof emeritus Kyoto U, Kyoto
T Mori, prof emeritus Tokyo Inst Tech, Tokyo
Minoru Taya, prof Univ. Washington, Seattle
Yuanchung Liang, former Research associate U Washignton, Seattle
Taishi Wada, prof. associate Yokohama NU/ Kyoto U
Jan Dutkiewicz, prof Polish Academy of Science, Krakow
Jan Van Humbeeck, prof. KU Leuven, Belgium
Richard Moat, prof The Open University, GB
PJ Withers, prof U Manchester, GB
Takafumi Hosoya, PhD student of Hokkaido U, now at JSW, Muroran
Yohei Yasuda, PhD studnet of Hokkaido U, now at Kanazawa U
Masaharu Tokizane, prof emeritus Ritsumeikan U (gone)
Takashi Koyari, graduate student of Kyoto U, now The Sangi-in Diet member
Tokujiro Yamamoto, prof. Utsunomiya U, Gunma
Yutaka Tottori, graduate student Hokkaido U, now Sapporo city Hall,
Kazuaki Sasaki, prof emeritus Hokkaido U, Sapporo
and many many others