...This refers to plate glass that has been thermally or chemically treated to create a compressive stress layer on its surface. Glass breaks when minute flaws on its surface, called Griffith flaws, grow due to tensile stress. Therefore, if a compressive stress layer is created on the surface, even if the glass is placed under a certain amount of stress, the surface stress will be kept in a compressive state and it will not break. *Some of the terminology explanations that mention "Griffith flaw" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…板ガラスに熱的あるいは化学的処理をほどこし,表面に圧縮応力層を作ったものをいう。ガラスの破壊は,その表面に存在する〈グリフィスのきずGriffith flaw〉と呼ばれる微細なきずが引張応力によって成長していくことによって起こる。したがって,表面層に圧縮応力層を作っておけば,ガラスがある程度の応力下におかれても,表面応力は圧縮状態に保たれ,破壊に至らない。… ※「Griffith flaw」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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