Study On Crack Propagation And Failure Morphology Of Glass Materials Based On Peridynamics

Glass materials have excellent properties such as high-temperature resistance,corrosion resistance,and light transmittance.They play an important role in national production and are widely used in building curtain walls,doors and windows,automotive windshields,aerospace,and other fields.However,glass structure will inevitably be damaged by impact or explosion loads during use as a typical low-strength brittle material,so its impact resistance has important research value.The current numerical simulations for the crack propagation and failure morphology of glass materials under strong load are mostly based on traditional continuum mechanics,which requires additional damage criteria and special mesh processing.This paper focuses on numerical simulation analysis,supplemented by experiments and theories.The crack propagation and damage failure behaviors of three glass structures are studied based on the peridynamics(PD)method under impact and explosion load.And highlighting the advantages of the PD method in numerical simulation analysis of brittle materials.The specific research contents and results are as follows:(1)The differences and connections between classical continuum mechanics and peridynamic theory are discussed.On the one hand,three constitutive models in PD theory are deduced,which provide the necessary theoretical support for the numerical simulations in the following sections.On the other hand,the implementation of PD numerical simulation finite element software and open-source software are introduced.(2)The dynamic response of the single-layer flat glass was simulated under impact load by the element deletion method,the discontinuous Galerkin PD(DG-PD)method,and the meshless particle PD(M-PD)method respectively.The maximum principal strain,the equivalent plastic strain,and the damage factor are used to represent the damage degree and crack propagation path.The element deletion method can roughly simulate the damage morphology of glass under impact load,but it is slightly insufficient in capturing crack bifurcation and penetration.In the DG-PD method,radial cracks and circumferential cracks are obvious,and a large number of glass fragments splash at the impact center and the frame.In the M-PD method,the size of the PD horizon and the impact velocity all have an important influence on the dynamic response of glass plates.In terms of damage morphology,the M-PD method and the DG-PD method have high consistency.(3)A new type of transparent sandwich structure is proposed,and its impact resistance is explored under high-speed impact load by using the light air cannon test device.The corresponding numerical simulation of this model was carried out by the DG-PD method.It is found that both the impact experiments and the numerical simulations can well reproduce the crack propagation process of the transparent sandwich structure.The radial cracks and circumferential cracks of the ceramic glass layer and the inorganic glass layer are obvious.Compared with the experiments,the numerical simulation can easily observe the damage of each layer and the splashing of specific fragments.The ceramic glass layer and the inorganic glass layer absorb most of the energy in the impact process,which is an important manifestation of the impact resistance of the transparent sandwich structure.(4)The crack propagation and damage failure behavior of the laminated glass structure is studied under explosion load.The effectiveness and accuracy of the DG-PD method are verified by comparison of some experiments and numerical simulations.It is found that explosion distance,explosive equivalent,and thickness of PVB adhesive layer have significant effects on the dynamic response of laminated glass structure.Comparing the maximum deflection of the inner recess,it is found that the PD method is in good agreement with the results of the experiment and the element deletion method,and the error range of the PD method is lower than that of the element deletion method.The energy absorption rate of the outer glass in the PD method is much higher than The inner glass and PVB adhesive layer,and the results of the PD method and the unit deletion method have high consistency.