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各種玻璃表面應(yīng)力分別是多少?
來(lái)源:www.szkingly.com 發(fā)布時(shí)間:2017-12-15


平板玻璃一般以表面壓應(yīng)力大小的不同分為鋼化玻璃、半鋼化玻璃及退火玻璃。根據(jù)美國(guó)ASTMC1048-1997b標(biāo)準(zhǔn)規(guī)定,各種玻璃的表面壓應(yīng)力范圍為:鋼化玻璃>69MPa(10,000psi),半鋼化玻璃為:24MPa(3500psi)~52MPa(7500psi).我國(guó)出臺(tái)的<

(1)鋼化玻璃

傳統(tǒng)檢驗(yàn)鋼化玻璃的方法是沖擊試驗(yàn),GB9963及GB9656規(guī)定在50mm′50mm范圍內(nèi)的碎片數(shù)須大于40粒。試驗(yàn)表明,在鋼化玻璃應(yīng)力范圍內(nèi),表面應(yīng)力值與碎片數(shù)存在著較好的對(duì)應(yīng)關(guān)系,40粒碎片數(shù)對(duì)應(yīng)的表面應(yīng)力值約為82MPa.高層建筑上應(yīng)盡量選用經(jīng)均質(zhì)處理的鋼化玻璃。

(2) 熱增強(qiáng)玻璃

熱增強(qiáng)玻璃在我國(guó)常被稱(chēng)為“半鋼化玻璃”。在建筑上應(yīng)用非常普遍,有較好的抗風(fēng)壓能力。此種玻璃受自然災(zāi)害破壞后傾向于留在窗框內(nèi)不掉落,同時(shí)又可確保不會(huì)自爆。ASTM規(guī)定熱增強(qiáng)玻璃的應(yīng)力范圍是24-52Mpa,鋼化玻璃的應(yīng)力須大于69MPa。應(yīng)力為51-69MPa范圍內(nèi)的玻璃是廢品,它既不能用作鋼化玻璃,也不能作為熱增強(qiáng)玻璃使用。

(3)鋼化安全玻璃

大量經(jīng)驗(yàn)表明,當(dāng)鋼化玻璃用于安全玻璃用途時(shí),其表面應(yīng)力值通常大于105MPa。常見(jiàn)的例子是汽車(chē)玻璃,如應(yīng)力小于105MPa,雖然碎片數(shù)仍能滿足有關(guān)標(biāo)準(zhǔn)要求,但玻璃強(qiáng)度略嫌不夠。

(4)熱彎玻璃

熱彎玻璃是一種退火玻璃,要求玻璃內(nèi)應(yīng)力盡可能小,確保玻璃不會(huì)因過(guò)大的不均勻應(yīng)力而破裂。在彎曲部分應(yīng)力較集中,表面應(yīng)力在15MPa左右,易導(dǎo)致玻璃碎裂。 表面應(yīng)力應(yīng)降至7MPa以下,基本可解決彎角破裂問(wèn)題。




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