Characteristics of residua 量 therrnal stress field at the vertexes of two interfaces in three − dilnen ・ sional joints with three ! ayers are { nvestigated using eigen alla 】 ysis fQrmulated by FEM and BEM using fundamental solutions for two phase materials . Angle between two side surfaces at the vertex is varied from 30°to l50°. An expressk } n for stress field near the vertex on the interface is firstly derived from the result of eigen analysis , The order of stress shgualrity decreases with

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... the increase ofthe an 暮 1e. Angular functions corresponding to stress components are deduced from eigen analysis , Acoe 伍 cient in 亡 he power terrn of angle fr (, m side surface in the angular function js a function of the angle between side surfaces and the vaLue of coe 伍 cient increases with the increase of the angle between side surfaces 、 A coe 缶 cient of power term in stress distribution for the distance from the vertex has an extremum at 9 P of the angle betweell side surfaces , It was found thatstress singularity field at the vertex with a weaker singularity is affected largely by that at the vertex with a stronger singularity . Thcre are two factors which define a stress singularity filed near the vertex ; 1) the intensity of singularity defined by the distance frem the vertex , 2)an angular function defined by the distance from stress singularity lines. The intensity of singulari し y at the veretx of interface was de丘ned considering these facters . The value of the intensity of singularity at the vertex increases with the increase of the angle between side surfaces