CFRP一方向材の圧縮強度に及ぼす試験片長さおよび応力集中の影響

概要

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There are various compression test methods for a unidirectional composite material, but they use different specimen lengths without cosidering the effect of specimen length in detail. In this paper, the effects of specimen length and stress concentration on the compressive strength of unidirectionally carbon-fiber-reinforced plastics were investigated. Compression tests for the CFRP were carried out for a wide range of specimen lengths, three different end tab configurations and two different end tab materials under the condition of constant specimen thickness. This was performed using the Celanese compression test method. The apparent compressive strength measured by the Celanese test method is lower than the true compressive strength because of the stress concentrations near the tab tip of the specimen. However, the apparent compressive strength of the specimen with a circular profile (R25) between the chucking part and the testing part (CFRP) which has slight stress concentration at the tab tip is higher than those of the Celanese specimen configurations. The true compressive strength was obtained using the specimen with the end tab of stainless steel and lengths of 3.2 mm and 6.4 mm.
一般社団法人日本機械学会の論文
1992-12-25