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圧粉体におけるひずみと応力の理論

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.4 (1972) No.3

圧粉体におけるひずみと応力の理論

Theoretical Treatments of Stress and Strain in Green Compacts of Powder 岸高 壽(Hisashi Kishitaka) 要旨 : 圧粉体の見かけ上均一なひずみをともなう変形について,その変形によって生ずる応力と, 粒子間接触面のまさつ係数,粒子自身のせん断降伏応力,圧粉体の気孔率,および粒子間 のからみ合いの不足を表わす係数とを関係づける理論式が導かれた。圧粉体のスプリング バック現象が有効弾性ひずみの考慮のもとにこの理論によって説明された。理論式から計 算された圧縮曲線は各種の鉄粉についての実験結果と定性的に一致した。 Synopsis :

On the deformation of green compacts with an apparently uniform strain, theoretical equations have been introduced whereby the stress caused by the deformation, the coefficient of friction at the contact surface between powder particles, the shearing yield stress of particles themselves, the porosity of the compact, and the degree of connection inter particles, are all correlated. The spring back phenomenon of green compacts is explained by this theory in consideration of the effective elastic strain. The compression curves calculated by the theoretical equation agree qualitatively with experimental results obtained from various kinds of iron powders.

(c)JFE Steel Corporation, 2003

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