On the stress distribution around a triple junction

The internal and external stresses around a triple junction of copper have been analysed by a disclination model and by a three-dimensional anisotropi c finite-element method respectively. The results indicate that the interna l stress depends on whether the triple line is an I-line or a U-line. At th e triple line the elastic strain energy concentrations caused by external s tresses depend on both the orientations of the component grains and the loa ding directions. For a loading direction parallel to the triple line, the e lastic energy concentration is usually large. For a loading direction perpe ndicular to the triple line, the elastic energy concentration is complex; i n some cases, elastic energy dispersion can occur but, in other cases, the elastic energy concentration is much larger than that with the loading dire ction parallel to the triple line.