耐火煉瓦の音響的非破壊試験について : (3)熱衝撃に対する抵抗性測定への超音波パルス技術の応用

概要

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Several methods have been used as resistance test for thermal shock of refractory bricks. Thermal shock resistance is customarily judged from the physical appearance or spalled weight percent of specimen when rapid heating and cooling are repeated. They remain generally qualiative. Spalling is based on intrinsic weakness for thermal shock stress. In this experiment, decrease of Young's modulus of refractory brick on thermal shock is measured by supersonic pulse technique and analyzed. The decreasing tendency has been statistically showed to be logarithmic to thermal shock repeating frequency (from room temperature to 1200C and vice versa). We have introduced spalling index by decreasing constant of Young's modulus. This method is considered to be successful in expressing the spalling character for schamotte bricks.
社団法人日本音響学会の論文
1962-07-30