A numerical method for predicting the deformation of crazed laminated windows under blast loading

• DOI: 10.1016/j.engstruct.2018.05.030
• Publication Date: 2018-06-15T00:28:02Z
• Authors: Paolo Del Linz; Xu Liang; Paul A. Hooper; Hari Arora; Luke Pascoe; David Smith; David Cormie; John P. Dear
• Keywords: Glazing; Digital image correlation; Crazing; Laminated Glass

The design of laminated glazing for blast resistance is significantly complicated by the post-crack behaviour glass layers. In this research, a novel numerical method based on semi-analytical energy model proposed crazed panes. To achieve this, non-homogenous cracks patterns observed in literature experimental and analytical work was taken into consideration. It assumed that, after crazing, further deformations would occur cracked edge areas, whilst central window surface remain largely undeformed. Therefore, different internal expressions were formulated each zone then combined overall model. resulting differential equation solved numerically. results obtained compared with data from four full-scale tests validation. Three these (Tests 1–3) presented previously (Hooper et al., 2012) 1.5 × 1.2 m samples made up two 3 mm layers 1.52 PVB membrane, using 15 30 kg charge masses (TNT equivalent) at 13–16 stand-off. fourth test (Test 4) conducted larger 3.6 2.0 pane 13.52 thickness, 100 mass 17 All employed Digital Image Correlation (DIC) technique to obtain 3D out-of-plane deflections strains. reproduced deflection profiles, best estimates more severe loading cases. Reaction forces also estimates. predictive ability could permit accurate designs be produced rapidly, improving structures such loadings.