Numerical simulations of impact fracture behavior of an automotive windshield glazing: An intrinsic cohesive approach
Numerical simulations of impact fracture behavior of an automotive windshield glazing: An intrinsic cohesive approach
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DOI：
10.1016/j.compstruct.2017.11.070
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发表时间：
2018-02-15
影响因子：
6.3
通讯作者：
Zang, Mengyan
中科院分区：
文献类型：
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作者：
Lin, Dejia;Wang, Di;Zang, Mengyan
汽车挡风玻璃作为汽车的重要部件，通常由两片玻璃片粘合一片PVB薄膜组成。在行人-车辆事故背景下，挡风玻璃的冲击破裂机制有助于行人安全保护和交通事故再现。本文的目的是验证固有粘聚区模型(CZM)在模拟挡风玻璃冲击断裂中的能力。建立了一个风挡有限元模型，在玻璃六面体有限元之间的所有公共面上插入粘性单元。利用商用显式有限元程序LS-DYNA对标准成人头部冲击器撞击挡风玻璃的断裂行为进行了数值模拟。数值模拟结果与相应的实验结果进行了对比，验证了数值模拟结果。为了进行比较，还采用了广泛使用的单元删除法(EDM)和塑性应变破坏准则进行模拟。仿真结果表明，本征CZM模型更适合于捕捉风挡玻璃的冲击破坏特征。最后，研究了玻璃粘结强度、PVB的力学性能和界面粘结对挡风玻璃冲击断裂行为的影响。
As an important component of a vehicle, the automotive windshield glazing normally consists of two glass sheets bonded with one polyvinyl butyral (PVB) film. In the context of pedestrian-vehicle accidents, the impact cracking mechanism of the windshield is conductive to pedestrian safety protection and traffic accident reconstruction. The purpose of this paper is to validate the capacity of the intrinsic cohesive zone model (CZM) in impact fracture simulations of a windshield. A windshield finite element (FE) model is established, where cohesive elements are inserted into all the common faces between glass hexahedral finite elements. The fracture behavior of a windshield impacted by a standard adult headform impactor is simulated with the commercial explicit finite element code LS-DYNA. Numerical simulation results are validated by comparison with the corresponding experimental outcomes. For comparison, additional simulations have been performed by the widely used element deletion method (EDM) with a plasticity strain failure criterion. Simulation results show that the intrinsic CZM is more suitable to capture the impact failure characteristics of windshield. Finally, the effects of the glass cohesive strength, mechanical properties of PVB and interfacial adhesion on the impact fracture behavior of the windshield are investigated.