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| PDF : |  12010020.pdf |
| title(En) : | Studies on Mechanical Properties of Plywood. II. YOUNG's Modulus in Bending |
| author(En) : | Motoaki Okuma |
| information : | Mokuzai Gakkaishi 12(1), 20-25 (1966) |
| assort : | Original Article |
| summary(En) : | The equations (2), (3), (4) are derived from the theory of composite beam, where, E0, E90, E45 : Young's modulus in bending of plywood, when the grain of the face veneer is respectively parallel, perpendicular and 45° to the span. e1, e2, e45 : Young's modulus in bending of veneer, when the grain is respectively parallel, perpendicular and 45° to the span. er12 : Young's modulus in bending of glue line (composite layer) in the specimen, of which the face veneer is parallel or perpendicular to the span. er45 : Young's modulus in bending of glue line (composite layer), of which the face veneer is 45° to the span. tr : Thickness of the composite layer (tr = 0.0218 cm) K1, K2 : Coefficients of plywood construction. They are calculated from the equations (5) and (6). The equations (7), (8) are derived from the equations (2), (3). E0 + E90 and E45 have liner relations with K1 and E0 - E90 has also linear relation with K2. So the author carried out bending tests on plywoods which were prepared by the same method as shown in the first report. The results are shown in Table 2 and Figs, 2, 3, 4. And the empirical formulas (9), (10), (11) are derived where the unit of E is 103 kg/cm2. From these experimental results, the formulas (12), (13) are obtained. Comparing equations (2), (3), (4) with (12), (13), (11), Young's moduli of veneer and composite layer (e1, e2, e45, er12, er45) can be also calculated. |