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| PDF : |  11060245.pdf |
| title(En) : | Puncture Test in Plywood and Hardboard. IV. |
| author(En) : | Shitomo Mamada |
| information : | Mokuzai Gakkaishi 11(6), 245-247 (1965) |
| assort : | Original Article |
| summary(En) : | To obtain the load and the absorbed energy at breaking through test in puncture test, plywood and hardboard were supported in circular plate of 20cm diameter. A striking block had a rod at the point which was respectively 10, 15, 20, and 25mm diameter and 12cm long. The buffer board (20mm particle board) was laid on a bed 10cm under the test board (Fig. 1). The oscilographs in this test, which were taken out by the same method as in the previous report, were shown in Fig. 3. In Fig. 2 (a model of oscilograph), the first convex (left, t0) shows the moment of striking at the test board and the second (right, t1) shows the moment of striking at the buffer board after passing through the test board. Assuming that v1 was constant as the test board was close to buffer board, we obtained formula (1). Where s was distance from rest board to buffer board and v1 was velocity after passing through test board. From formula (1) we obtained formula (2). Where, E was absorbed energy for breaking through the test board, t0 was velocity at the moment of striking the test board, and m was mass of striking block. The obtained results were shown in Figs 4, 5, and 6. The comparison between the values in this report and the values in a previous report were shown in Table 2, which indicated that the energy for passing through after breaking was larger in plywood than in hardboard. |