JP2013246177A - 機械的荷重のかかったガラスまたはガラスセラミック部材の耐破断性仕様を決定する方法 - Google Patents
機械的荷重のかかったガラスまたはガラスセラミック部材の耐破断性仕様を決定する方法 Download PDFInfo
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Abstract
【解決手段】本発明は、次のパラメータ:材料の所定の機械的荷重に依存する部材(1)の最短耐用期間、または機械的荷重が生じる所定の耐用期間に依存する機械的耐荷力のうちの1つにより、ガラスまたはガラスセラミック部材(1)の材料の仕様を決定する方法に関する。
【選択図】なし
Description
− 部材の所定の機械的荷重に依存する部材(1)の最短耐用期間、または
− 機械的荷重が生じる所定の耐用期間に依存する機械的耐荷力
のうちの1つにより、ガラスまたはガラスセラミック部材、あるいはまたそうした部材の材料の仕様を決定する方法を提供する。
− 部材の最短耐用期間と、部材への機械的荷重を設定する、
− 所定の機械的荷重において、少なくとも所定の最短耐用期間が達成できるように部材の寸法設計をする、
− 求められた寸法のガラスまたはガラスセラミック部材を作製する、式中、ガラスまたはガラスセラミック部材の寸法設計を、上述の関係式(1)を用いて行う。また、部材の寸法は、平均して最短耐用期間中に作用する荷重が、ガラスまたはガラスセラミック部材の材料中に平均してσB,cより大きい引張応力を生じないように選ぶ。
a)Zerodurガラスセラミックに対しては、nとして相対湿度が30%〜60%の空気中での非常に保守的な値として27〜33が見積もられている。文献での、測定値は50〜55の範囲である。50〜55のn値は、真空中や不活性条件下にも当てはまる。
b)ソーダ石灰ガラスに対しては、文献では下記の値が仮定された:
水中での亀裂に対して、n=16
相対湿度50%の空気中のガラス表面の亀裂に対して、n=18.1
不活性条件下または真空中で、n=70。
Claims (8)
- 次のパラメータ:
− 所定の機械的荷重に依存する部材(1)の最短耐用期間、または
− 機械的荷重が生じる所定の耐用期間に依存する機械的耐荷力
のうちの1つにより、ガラスまたはガラスセラミック部材(1)の材料の仕様を決定する方法において、
前記仕様決定はそのたびに次の関係式によって行われ、
tは、最短耐用期間、
nは、ガラスまたはガラスセラミック部材(1)の材料の応力腐蝕係数、
σB,cは、部材(1)の耐用期間中に生じる機械的引張応力の形態の機械的荷重、および
σB,rは、部材(1)において、応力増加速度
を表す、方法。 - ガラスまたはガラスセラミック部材(1)の製造方法において、
− 部材(1)の最短耐用期間と、部材への機械的荷重を設定する、
− 所定の機械的荷重において、部材の破断無しに少なくとも所定の最短耐用期間が達成できるように部材の寸法設計をする、
− 求められた寸法のガラスまたはガラスセラミック部材を作製する
工程を有し:
ガラスまたはガラスセラミック部材(1)の寸法設計を、次式を用いて行い、
tは、最短耐用期間、
nは、ガラスまたはガラスセラミック部材(1)の材料の応力腐蝕係数、
σB,cは、部材(1)の耐用期間中に生じる機械的引張応力の形態の機械的耐荷力、および
σB,rは、部材(1)において、応力増加速度
を表し、
部材(1)の寸法を、平均して前記最短耐用期間中に作用する荷重が、前記ガラスまたはガラスセラミック部材(1)の材料中に平均してσB,cより大きい引張応力を生じないように選ぶ方法。 - 請求項2に記載の方法において、前記所定の最短耐用期間が50%まで延長される、またはσB,cに対して50%まで高い部材の機械的耐荷力が、破断無しに達成するように、部材の寸法を設計することを特徴とする方法。
- 請求項2乃至3のいずれか1つに記載の方法において、前記ガラスまたはガラスセラミック部材(1)の作製後、その表面(2)に材料削除加工を施すことを特徴とする方法。
- 請求項4に記載の方法において、前記ガラスまたはガラスセラミック部材の表面(2)を研削後エッチングすることを特徴とする方法。
- 請求項6に記載の方法において、限界値を、測定値に3パラメータのワイブル分布を当てはめ、最小有効強度を、ワイブル分布がゼロになる引張応力、または、ワイブル分布がゼロになる点での引張応力よりたかだか20%低い引張応力として決定することを特徴とする方法。
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CN105784503A (zh) * | 2016-04-08 | 2016-07-20 | 东旭科技集团有限公司 | 一种玻璃板断裂韧性的测定方法 |
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KERKHOF VON FRANK ET AL.: "Festigkeit von Glas Zur Abhangigkeit von Belastungsdauer und -verlauf", GLASTECHN.BER, vol. 54, no. 8, JPN6016051049, 1981, pages 265 - 277, XP008166624 * |
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