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Recent explosions have prompted researchers to investigate the vulnerability of civil structures, leading to an increased demand for blast-resistant buildings. Laminated glass (LG) panels in glazed facades boost resilience, yet understanding glass fragment interaction with interlayers remains incomplete. This paper presents an integrated experimental-computational study on strain localization in LG polymeric interlayers to accurately simulate their response, addressing this gap. Uniaxial tensile tests were performed on the polymeric interlayer materials polyvinyl butyral (PVB) and SentryGlas® (SG), commonly used in the design of LG in blast-resistant glazing systems. Digital image correlation was used to characterize strain localization within the material. The experimental results were used to calibrate material model parameters to be used in the modeling of LG systems. A three-network viscoplastic (TNV) material model for SG interlayer was calibrated using PolymerFEM software. Yeoh hyperelastic material model parameters were calibrated for the quasistatic response of PVB. A finite element computational model was developed using Ansys LS-DYNA software and validated with experimental data. The study results showcase finite element modeling's ability to accurately predict both the hyperelastic response of PVB and the post-peak large strain behavior of SG interlayer materials by 8% and 3.6%, respectively.

In this paper, the static and dynamic constitutive behavior of aged and unaged virgin PVB were evaluated at different strain rates using static and impact drop-weight testing. The aged virgin PVB was subjected to random environmental conditions of different temperature and moisture levels. All static tests were performed at room temperature ranging between 21 and 32 °C. The results showed that the aged and unaged virgin PVB dynamic constitutive response consists of two linear parts. The first part is linearly elastic and independent of the rate of loading. However, the second linear part was found to be dependent on the strain rate. Aging significantly affected both the static and dynamic constitutive stress-strain relations. Comparing aged and unaged high-strain rate results showed that aging significantly affects the material response of the interlayer materials used in laminated glass, and subsequently, their dynamic response under blast loads. For the aged material tested in this paper, the strain rate effect was found to be less significant in the current test temperature range. [ABSTRACT FROM AUTHOR]