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Vol.38, No.3, 442 ~ 447, 2000

Title

Pesearch Paper / Mechanical Behavior : Analysis of Indentation in Split - type Speciments

서민홍Min Hong Seo,김형섭Hyoung Seop Kim,Min Seok Sohn

Abstract

Indentation tests using a spherical indenter for split-type two half specimens, so called bonded-interface technique, have been proposed as a means to index deformation behaviour or damage behaviour of the material during indenting the conventional one piece specimen. The purpose of this study is to assess the validity of the split-type specimen technique and to better understand the mechanics of indentation of the split-type specimens with respect to the effect of the interface condition between the two split-type half blocks. Accordingly, we performed indentation tests of Al alloy specimens with elasto-plastic stress-strain behaviour. The finite element method was also employed to investigate the deformation behaviour of the two (single piece and split-type) test systems loaded with a spherical indenter. The simulated geometry of the specimens and load-displacement curves during indentation are compared with the experimental results of the Al specimens. The similarity and difference in deformation behaviour and stress distribution between the single-piece specimen method and the split-type specimen method are investigated. The effect of the friction between the two half blocks in the split-type test is discussed.

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