Mean-field homogenization schemes of composite materials with nonlinear interface debonding

In a standing board fixing structure, a main board has a long hole, and a standing board has a hole inserting portion with taper faces of convergent shape formed at a bottom portion thereof. Engagement grooves are formed at an upper end portion of each taper face. A plated wire is attached onto the main board to stride across a region in the long hole corresponding to a lower edge portion on each taper face of the standing board. When the standing board is inserted into the long hole, the plated wire is guided to be gradually spread outwards along the taper faces and fitted and engaged in the engagement grooves, and the corresponding patterns of the standing board and the main board are soldered, whereby the standing board is stood and fixed on the main board.