Critical Size on Spontaneous Breakage of Tempered Glass Initiated by NiS Particle

doi:10.15541/jim20190082

Abstract

Abstract:

Extrusion stress due to phase change of the NiS, internal stress due to CTE mismatch between the NiS and glass, and local concentrated stress around the NiS due to synergistic effects above were quantitatively calculated based on equal strength theory and the deformation coordination relation between NiS and glass in this work. The effects of NiS particle diameter, local strength of glass and ambient temperature on spontaneous breakage of tempered glass were analyzed. The critical diameter of NiS particles was determined as well. The results show that the fundamental reason for spontaneous breakage of tempered glass is the circumferential concentrated stress (tensile stress) near the NiS particle. There exists non-linear relations between circumferential stress and NiS particle diameter of which the circumferential stress decreases rapidly with the decrease of NiS particle diameter when it is less than 0.2 mm, but circumferential stress increases moderately when it is greater than 0.5 mm. The critical diameter of NiS particle which causes the spontaneous breakage of tempered glass decreases with the increase of surface stress in the tempered glass. It is difficult to induce spontaneous breakage of tempered glass when the diameter of NiS particle is less than 0.1 mm. The circumferential stress increases linearly with the increase of ambient temperature, and the stress increases slightly faster for the NiS with larger diameter.

Key words: tempered glass, spontaneous breakage, phase change of the NiS, critical size

CLC Number:

TQ174

LIU Xiao-Gen,BAO Yi-Wang,WAN De-Tian,SUN Yu-Kang. Critical Size on Spontaneous Breakage of Tempered Glass Initiated by NiS Particle[J]. Journal of Inorganic Materials, 2020, 35(2): 211-216.

Figures/Tables 12

Fig. 1 Photographs of NiS particles in tempered glass (a) Enlarged photo of NiS particle in glass; (b) Glass crack around the NiS particle; (c) Photoelastic spot due to the concentration stress

Fig. 2 Diagram of deformation compatibility of phase change of the NiS particle

Fig. 3 Schematic diagram of stress distribution around the NiS particle

Fig. 4 Schematic diagram of circumferential stress gradient around the NiS particle

Fig. 5 Schematic diagram of tempered stress along the thickness direction of the tempered glass

Table 1 Values of calculating parameters[3]

Calculating parameter	Value
$E_{1}$/GPa	70
$E_{2}$/GPa	70
$\mu_{1}$	0.24
$\mu_{2}$	0.27
$\alpha_{1}$	8.8×10^-6
$\alpha_{2}$	16.3×10^-6
$\phi$/%	3
$\sigma{i}$/MPa	160

Table 2 Average circumferential stress with various diameters of the NiS particles

Diameter/mm	Stress/MPa	Diameter/mm	Stress/MPa
0.02	30.3	0.20	136.7
0.05	64.8	0.30	154.1
0.06	73.7	0.40	164.9
0.07	81.7	0.50	171.7
0.08	88.9	0.60	176.5
0.10	100.8	0.70	180.4
0.12	110.8	0.80	183.3
0.14	118.9	0.90	185.5
0.16	125.9	1.0	187.1
0.18	131.7	2.0	196.2

Fig. 6 Relationship between the circumferential stress and diameter of the NiS particle

Fig.7 Schematic diagram of local strength along the thickness direction of the tempered glass with thickness of 6 mm and surface stress of 90 Mpa

Table 3 Local strength at the neutral layer with different surface stress of the tempered glass/Mpa

Surface stress	40	50	60	70	80	90
Local strength	144	140	136	132	128	124
Surface stress	100	110	120	130	140	150
Local strength	120	116	112	108	104	100

Fig. 8 Relationship between diameter distribution and its proportion for NiS (statistical by on-site detection data)

Fig. 9 Relationship between circumferential stress and service ambient temperature

References 15

[1]	BAO Y W, LIU Z Q . Mechanism and criterion of spontaneous breakage of tempered glass. Journal of Inorganic Materials, 2016,31(4):401-406.
[2]	SWAIN M V . A fracture mechanism description of the microcracking about NiS inclusions in glass. Journal of Non-Crystalline Solids, 1980, 38-39:451-456.
[3]	SWAIN M V . Nickel sulfide inclusions in glass: an example of microcracking induced by a volumetric expanding phase change. Journal of Materials Science, 1981,16:151-158.
[4]	LEON J . A Review of the Nickel Sulphide Induced Fracture in Tempered Glass. Proceeding on Glass Processing Days, Finland, 2001: 108-110.
[5]	TÖLKE T, BARZI A, STACHEL D . Behaviour and phase transformations of nickel sulphide inclusions in glass melts. Journal of Physics and Chemistry of Solids, 2007,68(5/6):830-834.
[6]	JOHN C B . A study of nickel sulphide stones in tempered glass. Ultramicroscopy, 1993,52(3/4):297-305.
[7]	OUSSAMA Y, PATRICIA D, YVES B , et al. Phase transformations in nickel sulphide: microstructures and mechanisms. Acta Materialia, 2010,58(9):3367-3380.
[8]	BISHOPA D W, THOMASA P S, RAYA A S . Micro Raman characterization of nickel sulfide inclusions in toughened glass. Materials Research Bulletin, 2010,35(7):1123-1128.
[9]	WAN D T, BAO Y W, LIU X G J , et al. Spontaneous breakage source spontaneous breakage mechanism analysis and online testing technology on tempered glass used in door and window and curtain wall. China Building Materials Science & Technology, 2010(S2):178-184.
[10]	LI X, FANG Z P, READING I , et al. In-situ Inspection of Inclusions in Toughened Glass Panels of High-rise Buildings. Third Intl. Conf. on Experimental Mechanics and Third Conf. of the Asian Committee on Experimental Mechanics, 2005: 134-139.
[11]	GB11614-2009, 平板玻璃.
[12]	袁文伯 . 工程力学手册. 北京: 煤炭工业出版社, 1988: 641.
[13]	BAO Y W, JIN Z . Size effects and a mean-strength criterion for ceramics. Fatigue & Fracture of Engineering Materials & Structures, 1993,16(8):829-835.
[14]	KOLLI M, HAMIDOUCHE M, BOUAOUDJA M , et al. HF etching effect on sandblasted soda-lime glass properties. Journal of the European Ceramic Society, 2009,29(13):2697-2704.
[15]	LU J S, LIU W Z, DU J L , et al. Effect of etching time on surface microstructure and properties of glass treated in a mixed acid solution. Journal of Nanchang Hangkong University: Natural Sciences, 2013,27(2):79-84.