木材-エポキシ樹脂接着系のへき開破壊じん性

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This paper concerns with evaluation of cleavage fracture toughness of a wood-epoxy resin bond system using a double cantilever type specimen (Fig. 1). Wood has, generally, a non-uniform distribution of elastic constants even in one block. With consideration for this, a recommendable formula to determine cleavage fracture toughness ~lc on a double cantilever type specimen was derived as follows : [numerical formula] [numerical formula] where, P_c is the fracture load, δ_c is the opening of loading points at the beginning of fracture, t is the thickness of specimen, h is the height of an adherend, α=a/h and a is the length, of unbonded part (or crack) of a specimen. As these formulae include the observed deflection of the cantilevers (opening δ_c), the variation of elastic constants existing among adherends is automatically compensated and g_<lC> obtained by these formulae has less variation than that by ordinary methods (Table I). The factors affecting on cleavage fracture toughness g_<IC> obtained by these formulae for a wood-epoxy resin bond system were discussed experimentally. The results are as follows : (1) The thicker the glue-line is, the higher the cleavage fracture toughness is (Fig. 6). (2) The glue-line having a suitable flexibility gives higher cleavage fracture toughness (Fig. 5) . (3) The cleavage fracture toughness of a specimen having a thicker and flexible glue-line has higher dependence on test speed (Fig. 7).
社団法人日本材料学会の論文
1977-05-15

木材-エポキシ樹脂接着系のへき開破壊じん性

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