著者

福田 忠生 尾崎 公一 山部 匡央 飯坂 元哉 早川 悌二

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.49, no.3, pp.118-123, 2011-05-25 (Released:2012-01-13)

参考文献数

7

---

The structural behaviors and strength of actual pressure PET bottle have been investigated, mainly by experimental measurements under internal pressure. First, tensile tests of PET resin material for PET bottle were carried out in order to obtain the fundamental tensile properties and the stress-strain diagram. Then, the mechanical behaviors of PET bottle were found by strain measurements under internal pressures. Finally, burst tests were conducted for 21 PET bottles. In the present burst tests, resulted magnitudes of burst pressures were not so much scattered, within the range of 1. 9∼2. 3 MPa. Fractured shapes of bottles by bursting would be categorized in three kinds of I, L, X types. For trial, burst pressure evaluation for the bottle were made by applying the theoretical analysis of N. L. Svensson. The calculated bursting pressure and radial deflection were numerically near the experimental values. However, in further investigation for more rigorous solutions, the following items are to be studied: (1)The material properties including stress-strain diagram for the actual bi-axially oriented PET bottle itself formed by blow molding, not only PET resin material. (2)The development of analytical approach for large deformation to the range of bursting.

著者

尾崎 公一 福田 忠生 西 亮 椎森 康雄 早川 悌二

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.73, no.726, pp.279-284, 2007-02-25 (Released:2011-03-02)

参考文献数

4

被引用文献数

1

---

In order to investigate the flow of molten metal in a cavity of a die, experimental simulation was carried out by using water flow model. The experimental cavity was constructed of a backward step configuration for test zone, in which flow behavior and air exhaust process from the cavity were investigated. With rib material installed down the step, its effect on air exhaust promotion was examined for various flow velocities. The main results obtained are as follows : Air exhaust from the cavity is remarkably promoted by installation of rib because the strong turbulence around the rejoining potion of two different flows, which are separated by the rib at the upstream, broke rapidly the trapped air into small bubbles. The time taken to complete air exhaust process is in inverse proportion to the flow velocity in the high velocity region, while it is proportion to the flow velocity to the -2.27th power in the low velocity region.