円孔を有する平織り方ラス織り布強化複合材料の静的強度に及ぼす織りピッチの影響

概要

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This paper describes the effect of textural pitch on the static strength of the hole notched composite reinforced by plain woven glass cloth. In the test, the static strength under tensile load was measured. The notch factor was used to evaluate the strength of hole notched specimen. The notch factor is defined as the ratio of the strength of unnotched specimen to that of hole notched one. This paper proposes a prediction method for the notch factor in consideration of the textural pitch of woven cloth as reinforcement. To investigate the influence of textural pitch on the stress distribution, the FEM calculation was carried out with a simplified model. The fllowing conclusions were obtained. The notch factor changed with the ratio of the textural pitch of cloth to the width of specimen (P/W), in spite of constant value of the ratio of the hole diameter to the width of it (D/W). When the P/W was large, the notch factor was small and the stress concentration factor calculated by FEM was also small. The difference in notch factor can be explained by that of stress concentration factor. It is concluded that the internal dimension of material (for example, textural pitch) affects the stress concentration and the notch factor. The notch factor is well predicted when the characteristic length `d_0' of Nuismer-Whitney's point stress criteria (PSC) is described as a power function of the p/w.
社団法人日本材料学会の論文
1992-05-15