| 车身粘接结构断裂失效准则改进 |
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| 引用本文： | 那景新,娄菲,纪俊栋,李锋.车身粘接结构断裂失效准则改进[J].交通运输工程学报,2020,20(5):116-124. |
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| 作者姓名： | 那景新 娄菲 纪俊栋 李锋 |
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| 作者单位： | 1.吉林大学 汽车仿真与控制国家重点实验室, 吉林 长春 1300222.中国重型汽车集团有限公司, 山东 济南 2501003.吉林大学 机械与航空航天工程学院, 吉林 长春 130022 |
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| 摘 要： | 为了解决现有失效准则无法满足粘接结构真实失效预测的问题, 利用试验测试与仿真分析相结合的方法建立一种基于应力的断裂失效准则; 设计了5组典型拉剪比的ISR-7008/铝合金粘接接头, 并对5组不同拉剪比的粘接接头进行准静态拉伸试验, 获得了初始断裂载荷与最大断裂载荷, 确定了胶层断裂失效点的起始位置; 建立了粘接接头的仿真模型并在仿真模型中施加初始断裂载荷, 提取出5组典型拉剪比的接头失效区域内初始断裂点的各种应力; 通过对失效点的各种应力进行比值和线性组合处理, 得出等效应力计算公式, 基于该等效应力计算公式建立适用于粘接结构的初始失效和后续失效统一的失效准则; 设计了验证试验方案, 通过对比试验结果和仿真结果, 分析了失效准则的有效性。分析结果表明: 在75°嵌接接头中, 仿真分析获得的失效载荷为1 717.6 N, 试验测试获得的失效载荷为1 936.4 N, 试验和仿真的相对误差为11.3%;仿真结果与试验测试的胶层失效过程基本吻合, 验证了本文建立的失效准则的有效性。建立的基于应力的失效准则实现了粘接结构初始失效准则和后续失效准则的统一, 可以较为准确地预测复杂应力状态下粘接接头的失效过程, 并且该失效准则解决了弹性粘接剂厚胶层的仿真问题, 为工程实际应用中的粘接结构强度设计提供了一定参考。
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| 关 键 词： | 车辆工程 车身轻量化 粘接结构 失效准则 改进研究 VUMAT子程序 |
| 收稿时间： | 2020-03-07 |
Improvement of fracture failure criterion of body adhesive structure |
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| NEI Jing-xin,LOU Fei,JI Jun-dong,LI Feng.Improvement of fracture failure criterion of body adhesive structure[J].Journal of Traffic and Transportation Engineering,2020,20(5):116-124. |
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| Authors: | NEI Jing-xin LOU Fei JI Jun-dong LI Feng |
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| Affiliation: | 1.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, Jilin, China2.China National Heavy Duty Truck Group Co., Ltd., Jinan 250100, Shandong, China3.School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, Jilin, China |
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| Abstract: | The existing failure criterion cannot meet the real failure prediction of bonding structures. Thus, a stress-based fracture failure criterion was established by combining an experimental test and simulation analysis. Five groups of ISR-7008/aluminum alloy bonding joints with typical pull-shear ratios were designed. Quasi-static tensile tests were carried out on the five groups of bonding joints with different pull-shear ratios. The initial fracture load and the maximum fracture load were obtained. The initial location of adhesive fracture failure point was determined. A simulation model of the bonding joint was developed. The initial fracture load was applied to the simulation model. The stresses at the initial fracture point in the failure area of the five joints with typical pull-shear ratios were extracted. Through the ratio and linear combination of various stresses at the failure point, an equivalent stress calculation formula was obtained. Based on the equivalent stress calculation formula, a unified failure criterion suitable for the initial failure and subsequent failure was obtained. A verification test plan was designed. The validity of failure criterion was illustrated by comparing the test results and simulation results. Analysis result shows that the fracture load obtained by the simulation analysis in the 75°scarf joint is 1 717.6 N, while the fracture load obtained by the test is 1 936.4 N. The relative error is 11.3%. The simulation results are consistent with the failure process of bonding layer tested in the experiment. The failure criteria established in this study are verified. The unification of initial failure criterion and subsequent failure criterion of the bonded structure is realized in the stress-based failure criterion established in this study. The failure of bonding joints under complex stress conditions can be predicted more accurately. The simulation problem of the thick layer of elastic adhesive is solved by this failure criterion. A certain reference for the strength design of bonding structure in practical engineering applications is provided. |
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