有限要素法を用いた木材の破壊過程のシミュレーション(<小特集>木質材料小特集)

概要

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An exisiting FEM program for elastic-plastic problems was converted to the one which can be accomodated to the change of stiffness matrix and the release of stress at fractured elements. With this program, the fracturing processes of two testing types of wood (spruce) were simulated ; the standard JIS shearing test (JIS Z2114) and the standard JIS bending test (JIS Z2113). The results are summarized as follows. (1) The shearing strength obtained by the calculation was 90.6 kgf/cm^2. This value agreed with the actual testing data. The fracture initiated and propagated along the grains. This simulated result accorded well with the real fracturing process in the shearing test. (2) The bending strength obtained by the calculation was 1297 kgf/cm^2, which was larger than the actual value because the finite element mesh was rough and thus the scalr factors for yieldingwere estimated as large values. The fracture initiated at the bottom of the specimen, grew to the neutral axis and turned its direction to the grain. This simulated result accorded well with the real fracturing process in the bending test.
社団法人日本材料学会の論文
1992-02-15