脆性材料円柱の熱応力による割断

概要

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Crack opening and closing behavior was analyzed on an external circular crack whose peripheral faces were heated axisymmetrically with constant heat flux. At the beginning of heating, crack faces start to contact at the peripheral region. Then, the region spreads inwards. The near-tip crack faces, on the other hand, open from the beginning of heating and the opening displacement increases with time for a certain duration. The displacement, however, tends to decrease after attaining the maximum until the crack closes completely. Correspondingly, the stress intensity factor increases with time and attains its maximum in the course of heating. Using externally cracked glass cylinders heated by a CO_2 laser beam, crack opening displacements were measured experimentally by the optical interference method. The measured displacements were consistent with the FEM analysis.
一般社団法人日本機械学会の論文
1994-02-25