[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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   The locally-coupled approach based on continuum damage mechanics and the finite element method has been applied to the thermal fatigue life evaluation of the vibration metal bonding. The analyzed metal bonding is composed of the copper bar and the aluminum base plate. It is experimentally known that the thermal fatigue fracture takes place in the aluminum. The part 1 describes the identification of the damage model based on the material test results for the aluminum. [This abstract is not included in the PDF]

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   The locally-coupled approach based on continuum damage mechanics and the finite element method has been applied to the thermal fatigue life evaluation of the vibration metal bonding. The analyzed metal bonding is composed of the copper bar and the aluminum base plate. It is experimentally known that the thermal fatigue fracture takes place in the aluminum. The part 2 describes the fatigue life evaluation of the metal bonding. [This abstract is not included in the PDF]

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   We propose an identity based encryption scheme with forward security. In our scheme, the top secret, called the master key, evolves through every time period. Our scheme is provably secure in the sense of FS-IND-ID-CPA based on DBDH assumption in standard model.
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   Hardened cementitious materials consist of various kinds of pores, like gel pores, capillary pores, air voids and so on, whose size and shape distribution is often called pore structure. However, the connection between these pores, which creates Ink-bottle relation and dominate drying shrinkage or ion absorption. Mercury intrusion porosimetry (MIP) test is one of the widely used methods to study the pore structure of cementitious materials. However, it is well known that the evaluation of pore structure by MIP is not totally accurate. The main reasons are the ink-bottle effect and the destruction of pores due to excessive high pressure.
A unique method that can determine volumes of continuative pore and discontinuative pore structure is proposed. Furthermore, according to this method, a suitable maximum intrusion pressure can be selected. In this study, boundary pore between capillary and gel pores is found using the results of the proposed method. [This abstract is not included in the PDF]

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   It is well known that the evaluation of pore structure by mercury intrusion porosimetry (MIP) is not totally accurate. The main reasons are the ink-bottle effect and the destruction of specimens due to excessive high pressure. Since mercury is intruded continuously from surface to inside of specimen, MIP test can obtain information about pore continuity. A unique method that can determine volumes of connected pores and ink-bottle pore structures is proposed. Also, the method can select a suitable maximum intrusion pressure. [This abstract is not included in the PDF]

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