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鋼化爐操作之應(yīng)力斑鑒定方法
來源:www.szkingly.com 發(fā)布時(shí)間:2015-07-06


1、鑒定依據(jù)

     由鋼化工藝的特點(diǎn)可知,鋼化處理后玻璃的應(yīng)力是不均勻的,其各向異性屬性明顯,我們知道,玻璃中不均勻應(yīng)力的存在會引起光線的雙折射現(xiàn)象,光線的雙折射現(xiàn)象可通過偏振光觀察。把鋼化處理過的玻璃放在偏振光下,當(dāng)一點(diǎn)形成的兩束光與另外一點(diǎn)形成的光束產(chǎn)生干涉現(xiàn)象時(shí),在玻璃表面可以觀察到不同區(qū)域的顏色和明暗變化,這就是應(yīng)力斑。鋼化處理后玻璃的應(yīng)力斑是一定存在的。

      自然光通過鋼化處理后的玻璃時(shí),其可見光波段在玻璃表面以某一角度反射時(shí),其部分光線變發(fā)生了偏振,透過玻璃的折射光也有部分發(fā)生了偏振,反射光和折射光都是部分偏振光,由布儒斯特定律可知,當(dāng)人射角為特定角度時(shí),反射光才是線偏振光,該入射角為布儒斯特角。在以入射角為56度觀察玻璃時(shí),應(yīng)力斑最明顯。

2、鑒定過程

      取需要鑒定的玻璃,在一定的光照下條件下,從光線入射角為56度的角度或用偏振片、偏振光眼鏡觀察玻璃,若玻璃經(jīng)過鋼化處理,則會看到玻璃表面有不規(guī)則的帶狀或片狀應(yīng)力斑,未經(jīng)過鋼化處理的玻璃則無此現(xiàn)象。

3、適用性和局限性

      (1)適用性:通過觀察應(yīng)力斑的鑒定方法屬非破壞性試驗(yàn),在實(shí)際工程中,具有廣泛的應(yīng)用。

      (2)局限性:在沒有偏振光片或偏振光眼鏡的情況下,偏振光的強(qiáng)度受天氣和自然光入射角的影響,應(yīng)力斑不容易觀察到。




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