硬質塩ビ板ISO小形試験片によるシャルピー衝撃値について

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It was shown in the previous paper^<1)> that the absolute value and characteristics of the Charpy impact strength of rigid PVC plates varied with different shapes of impact test specimens which were specified by various standards. Besides the standard-size specimen, the ISO R 179 specifies the standard-small-size specimen mainly for the testing of moulded materials. In order to obtain the relation of the Charpy impact strength based on the standard small ISO specimen to the other impact strength based on the JIS, the ASTM, and especially the standard ISO specimens, the same ten kinds of rigid PVC plates as were used in the previous paper have been tested this time using the standard small ISO specimen. The standard small ISO specimen had flatwise notch, whereas the JIS, the ASTM and also the standard ISO specimens had edgewise notch. So for comparison, the test of those plates has been conducted by using the same dimension as the standard small ISO specimen with the edgewise notch instead of flatwise notch. The results obtained are summarized as follows : (1) The standard small ISO Charpy impact strength (ss・ISO・a<kC>) of the test plates takes the value from 2.1 to 4.O kg-cm/cm^2, and the standard small ISO (Edgewise) Charpy impact strength (ss(e)・ISO・a<kC>) of the test plates the value from 1.5 to 3.0 kg-cm/cm^2, in spite of the fact that the standard ISO Charpy impact strength (S・ISO・a<kC>) of the test plates takes roughly constant value i. e. 2,5 kg-cm/cm^2 as was shown in the previous paper. (2) The value of ss・ISO・a<kC> and that of ss(e)・ISO・a<kC> are both divided into two groups, thougth their characteristics differ from each other. (3) Generally speaking, it can be said that the strength of ss・ISO・a<kC> shows the characteristic similar to that of the ASTM Charpy impact strength (ASTM ・a<kC>).
1970-02-15

硬質塩ビ板ISO小形試験片によるシャルピー衝撃値について

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