Influence and Mechanism of Crack Morphology on Post-Fracture Stiffening Effect of SG-laminated Glass

doi:10.16183/j.cnki.jsjtu.2023.549

Abstract

Abstract:

The effect of tension stiffening allows SG-laminated tempered glass to preserve specific post-fracture mechanical performance, which is significantly influenced by crack morphology, including fragment density and distribution. Accurately evaluating and predicting the post-fracture performance of laminated glass is essential for balancing cost and performance. However, limited work has addressed how crack morphology affects the stiffening behavior of laminated glass after fracture. In this paper, a series of random-cracked tensile tests on SG-laminated tempered glass is performed. The results reveal that the fragment density influences the post-fracture performance of SG-laminated glass by affecting the stress trajectory, and the tensile strength and equivalent stiffness decrease linearly and exponentially, respectively, with increasing fragment density. Afterwards, according to the experimental results, a hypothesis of the effective bonding is proposed and an improved finite element model is then developed. The proposed model accurately predicts the post-fracture tensile performance of laminated glass. Finally, the impact of fragment offset on the stiffening effect is discussed.

Key words: laminated tempered glass, SG-laminated glass, post-fracture stiffening effect, crack morphology, numerical analysis

CLC Number:

TU524

PENG Shennan, YANG Jian, WANG Xing’er, LU Mincheng, ZHU Yuhan. Influence and Mechanism of Crack Morphology on Post-Fracture Stiffening Effect of SG-laminated Glass[J]. Journal of Shanghai Jiao Tong University, 2025, 59(8): 1123-1132.

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试件编号	钢化水平	表面应力/MPa	夹层玻璃厚度/mm
6a	低	76.82	6/1.52/6
8a	低	69.53	8/1.52/8
12a	低	60.80	12/1.52/12
6b	中	91.50	6/1.52/6
6c	高	103.41	6/1.52/6

试件编号	${\stackrel{-}{\sigma }}_{\mathrm{b}}$/MPa	${\stackrel{-}{\sigma }}_{\mathrm{b}}$增强率/%	${\overline{E}}_{\mathrm{e}\mathrm{f}\mathrm{f}}$/MPa	${\overline{E}}_{\mathrm{e}\mathrm{f}\mathrm{f}}$增强率/%
SG	28.38	—	570.89	—
6a	40.20	41.7	2 664.16	366.7
6b	36.72	29.4	1 166.13	104.3
6c	30.83	8.6	917.85	60.8
8a	37.66	32.7	4 770.89	735.7
12a	36.74	29.5	4 700.46	723.3

参数	取值
参数	玻璃	SG
弹性模量,E/GPa	70	1
泊松比,ν	0.22	0.4
密度,ρ/(kg·m^-3)	2 500	950
厚度,t/mm	6	1.52
断裂应变,${\epsilon }_{\mathrm{f}}^{\mathrm{p}\mathrm{l}}$		1.142
断裂能,E_f/(J·m^-2)		1.9

η	抗拉强度/MPa			等效抗拉刚度/MPa
η	6a-3	6b-3	6c-3	6a-3	6b-3	6c-3
0	34.9	33.5	31.4	3 169.4	1 513.4	1 090.4
0.33	38.3	34.4	32.1	3 479.9	1 415.4	1 119.4
0.67	49.4	37.1	34.1	3 503.1	1 399.3	1 105.4
1	61.5	43.2	36.9	5 586.4	1 299.2	979.5