Shuangmei Zhao

Dynamic response of laminated automotive glazing impacted by spherical featureless headform

Abstract During vehicle accidents, the occupants head impacting on windshield or side window is commonly observed. Head-impact safety is a significant consideration in the design of passenger vehicles, so it is necessary to investigate the mechanical behavior of automotive glazing subjected to occupant head impact. An analytical solution based on the large-deflection plate theory is presented for the dynamic response of a laminated automotive glazing subjected to simulated head impact. The results of the analytical solution are compared with those obtained using a 3-D nonlinear finite element model. In order to understand the failure behavior of laminated automotive glazing, various geometric parameters are investigated to determine their effect on the maximum principal stress and hence failure initiation.

Analysis of Damage in Laminated Architectural Glazing Subjected to Blast Loading

Any attempt to design glazing that minimizes bodily injury and property damage during a bomb blast requires a thorough understanding of the fracture behaviour of architectural glazing subjected to blast loading. A continuum damage mechanics (CDM) based constitutive model has been developed and implemented into a finite element code to study the failure and damage behaviour of laminated architectural glazing subjected to simulated blast loading. An anisotropic elastic damage tensor with a linear damage evolution law has been chosen to model the failure of the laminated glass by cracking. The damage patterns and zone sizes are predicted by the model. Various geometric parameters has been investigated to determine their effects on the failure resistance of laminated glass.

Crack initiation in laminated automotive glazing subjected to simulated head impact

Abstract A very limited work has been done to understand the fracture in laminated automotive glazing when the head impacts on the windshields or side windows. A good understanding of the fracture plays a critical role in designing the laminated glass for utmost safety in automotive glazing. A finite element method based on the energy release rate criterion (J-integral criterion) is employed to determine the crack initiation time and location. A parametric study is done to determine the effect of various geometric parameters on the crack initiation time and location. Also, the cracking behavior of a monolithic glass is evaluated and compared with that of the laminated glass of comparable thickness.

Modeling Fracture in Laminated Automotive Glazing Impacted by Spherical Featureless Headform

Laminated glass consisting of two soda lime glass plies adhered by a polyvinyl butyral interlayer (PVB) is used for automotive glazing. This paper describes the application of a dynamic, nonlinear finite element method toinvestigate the failure modes of a laminated glass subjected to low-velocity impact with a spherical headform. Crack type, crack location and crack initiation time are evaluated using the maximum principal stress and J-integral criterion. Failure occurred due to lexural stresses and not bearing stresses. The first crack always initiated at the center of the outer impacted ply and PVB interface, and later on the exterior surface of the inner ply. The PVB thickness and velocity of impact had little or no effect on the first crack initiation.