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Sandeep Pedam


During vehicle accident, occupants head impacting on windshield or side window is commonly observed. It is estimated that over 40,000 people are killed annually in vehicle related accidents in the United States. Use of laminated glass which consists of two soda lime glass plies adhered by a polyvinyl butyryl (PVB) interlayer on automotive windshields and side windows can reduce the possibility of body injury and property damage caused by flying glass fragments. Most of the previous work on laminated glass under head impact has primarily concerned the dynamic response of head rather than the laminated glazing. Any attempt to design glazing that minimizes injury to and death of occupants during a vehicle accident requires a thorough understanding of the mechanical behavior of automotive glazing subjected to head impact loads.

A 3-D nonlinear dynamic finite element model is developed to study the dynamic response of a laminated glazing subjected to simulated head impact. An analytical solution based on the large-deflection plate theory is presented to compare with the FEA result. The crack initiation time and location are determined using a finite element method based on the energy release rate criterion (J-integral criterion). A constitutive model based on the continuum damage mechanics (CDM) is employed and implemented into the finite element model to study the failure and impact resistance of laminated automotive glazing. The damage patterns and zone size are predicted. The CDM based constitutive model has been extended to investigate the failure behavior of a laminated architectural glazing subjected to blast loading.

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