ISSN 0004-881X

A Technique For Introducing Precrack By Utilizing Frictional Forces on Glass CT Specimens and Fracture Toughness Values of Glass

by A. Hashimoto¹, Y. Yamashita²
1 College of Engineering, Nihon University, Tamura-machi, Koriyama-city, Zip.963-8642, Japan
2 JTEKT Corporation, 3-5-8, Minamisemba, Chuo-ku, Osaka-city, Zip.542-8502, Japan

Abstract

In order to develop a technique whereby a precrack can be introduced to CT specimens made from brittle materials, experiments were carried out using glass CT specimens. The precracks were introduced using a technique where the length of the precrack can be controlled by utilizing the frictional force occurring at the surface of the CT specimen under local compression. Frictional force is applied to the contact surface of the CT specimen which is stacked between two loading blocks, by the difference in Young`s modulus of the CT specimen and the loading blocks. Characteristics of this technique are that the precrack is almost straight plus it`s length is controllable. The fracture toughness values of the glass CT specimens were also examined in the experiments. It was shown that fracture toughness values show not only good reproducibility but are also within the range of expected values for the glass.

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