異材接合界面の強度評価方法の提案

抄録

This paper deals with the method to estimate the strength of the bonded face at which singular stress distributions are caused.
Brazing and adhesive joints were prepared to obtain the strength of the bonded face experimentally.
The authors propose the energy release rate g at the imaginary crack tip to estimate the strength of the bonded face. From the theoretical and numerical analises by using BEM, the energy release rate exponent to imaginary crack length “m” was proposed as 2nd parameter to estimate the strength of bonded dissimilar materials.
The results obtained from applying these two parameters to estimate the experimental strength are as follows.
1) The energy release rate g-value at the imaginary crack tip located at the end of the bonded face is useful for estimating the strength of the bonded face between dissimilar materials.
2) When the difference between the m values of specimens are small, the author’s method for estimating the strength has a potentiality to estimate the strength among the different shaped specimens.