裂纹形态对SG夹层玻璃开裂后硬化效应的影响机制

doi:10.16183/j.cnki.jsjtu.2023.549

摘要/Abstract

摘要：

SG离子型中间膜夹层热钢化玻璃(简称SG夹层玻璃)在拉伸硬化效应作用下,破坏后仍具有一定的残余强度,裂纹形态参数(如碎片密度和碎片分布)对其后破坏性能有显著影响.准确评估和预测夹层玻璃开裂后的性能,是提升其成本和性能综合效益的重要基础.目前,裂纹形态对夹层玻璃开裂后硬化效应及影响机制的研究尚显不足.首先通过SG夹层玻璃随机裂纹拉伸试验发现,碎片密度通过影响应力路径对夹层玻璃的开裂后性能产生影响,表现为抗拉强度和等效刚度随碎片密度增大分别呈线性和指数下降.随后,基于试验结果提出有效黏结区域假设,并建立精细化有限元模型,实现了对夹层玻璃开裂后抗拉性能的准确预测,同时探讨了碎片层交错程度对夹层玻璃开裂后硬化效应的影响规律.

关键词: 夹层热钢化玻璃, SG夹层玻璃, 开裂后硬化效应, 裂纹形态, 数值分析

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

中图分类号:

TU524

彭沈楠, 杨健, 王星尔, 陆敏铖, 朱禹翰. 裂纹形态对SG夹层玻璃开裂后硬化效应的影响机制[J]. 上海交通大学学报, 2025, 59(8): 1123-1132.

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