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T. Yoshizawa¹, T. Wakayama²
Structural Longevity, Vol.6, No.1, pp. 1-7, 2011, DOI:10.3970/sl.2011.006.001
Abstract This paper summarizes a principle for measurement of inner diameter or profile of pipes and tubes using optical method. Based on this principle, compact probes have been developed for industrial applications such as car industry, heavy industry and civil engineering. In addition to large probes for pipes, tubes and tank-like objects with diameter larger than 1meter, such small size probes as 5mm ∼25 mm in diameter has been produced including prototypes and commercialized products. We report availability and utility of our principle and probes we developed with some experimental results. More >

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Y.C. Liu^1,2, Y.H. Hsu^1,3, Y.S. Hsu^1,4, J.H. Huang^1,5
Structural Longevity, Vol.6, No.1, pp. 9-24, 2011, DOI:10.3970/sl.2011.006.009
Abstract This paper presents the result of a theoretical study on a new fluid density measuring concept which uses the effect of external fluid loading on a vibrating thin plate. The underling physical principle of this concept is that the resonance frequencies of an immersed vibrating plate change with the surface impedance changes caused by the mass density variations of the external fluid. In this paper, the analytical solutions of resonance frequencies with specific gravity are demonstrated by a COMSOL the finite element simulation. The theoretical analysis presented in this paper shows that the resonance frequencies of an immersed vibrating thin… More >

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A. Takayama¹, S. Saito², A. M. Ito¹, S. Yonemura², H. Nakamura^1,2
Structural Longevity, Vol.6, No.1, pp. 25-30, 2011, DOI:10.3970/sl.2011.006.025
Abstract We have been developing a molecular dynamics (MD) simulation code, a binary collision approximation (BCA) based simulation code, and a BCAMD hybrid simulation code. In this paper, an overview of the codes is presented. BCA-based simulation results of hydrogen isotopes injection into graphite target are also shown. More >

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Li Shan¹, Ming Cheng¹, Kaixin Liu^1,2,3
Structural Longevity, Vol.6, No.1, pp. 31-38, 2011, DOI:10.3970/sl.2011.006.031
Abstract In the present paper, a combined scheme of discrete element method (DEM) and meshless method for numerical simulation of impact problems is proposed. Based on the basic principle of continuum mechanics, an axisymmetric DEM framework is established for modeling the elastoplastic behavior of solid materials. A failure criterion is introduced to model the transformation from a continuum to a discontinuum. The friction force between contact elements is also considered after the failure appears. So our scheme can calculate not only the behavior of continuum and discontinuum, but also the transformation process from continuum to discontinuum. In addition, a meshless interpolation… More >

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