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| PDF : |  12030123.pdf |
| title(En) : | Studies on the Mechanical Properties of Plywood. V. Shearing Modulus in Panel Shear Test |
| author(En) : | Motoaki Okuma |
| information : | Mokuzai Gakkaishi 12(3), 123-128 (1966) |
| assort : | Original Article |
| summary(En) : | Panel shear tests (ASTM method and LW-improved method) on 11 kinds of veneer construction plywood (given in 1st report) have been carried out. Test results are shown in Table 1. If we take the coefficient of plywood as f, the calculating formulae for shearing modulus (6), (7), (8) are derived. f : Number of glue lines in the unit thickness of plywood. f = (n - 1)/t where n : Number of plies t : Thickness of plywood On the other hand, the theoretical shearing moduli of plywood are calculated from the rhombic system theory using modulus of elasticity and Poisson's ratio, and they are compared with the experimental values (shown in Table 2 and 3). It is verified that the LW-improved method is better than the ASTM method by comparing α090 with β090 (σ remark of Table 2 and 3). An empirical formula is also obtained for the conversion of values of shearing modulus in both methods as shown in formula (14). |