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| PDF : |  08020054.pdf |
| title(En) : | Shearing Modulus of Plywood and Hardboard Measured by the Panel Shear Test. II. Investigations on the Form of the Load Strain Curve |
| author(En) : | Motoaki Okuma, Shitomo Mamada, Shinji Hirai |
| information : | Mokuzai Gakkaishi 8(2), 54-58 (1962) |
| assort : | Original Article |
| summary(En) : | In the previous paper, the authors reported that the load-strain curve of hardboard measured by the ASTM method of panel shear test was composed of two straight lines which had different inclinations as shown in Fig. 2. In this paper we describe our investigations into the cause of such result and report the following observations: 1) There is no sudden change of the loading rate during the test, as shown in Fig. 3. 2) There is no slip between the reinforcing block and the specimen during the test in the normal way. The effect of degree of tightening of block and specimen is indicated in Figs. 4, 5 and 6. 3) With the loading, the specimen develops some bending deformation in the direction perpendicular to the surface of specimen as shown in Figs. 8 and 9. This fact is taken to be the cause of the irregular form of the load-strain curve. 4) A load-strain curve of plywood in which the load direction is perpendicular to the grain of face veneer is shown in Fig. 10. |