Investigation Of The Breakage Of Soda-lime Glass Plates Under Impact Loads

Soda-lime glass materials are widely used,especially in civil construction industry and automobile industry.Under impact loads,the broken fragments of soda-lime glass materials have a great threat to people's life and property.Therefore,it is necessary to study the breakage process of soda-lime glass materials and components under impact loads,to predict the damage degree of glass under the impact or to guide the design basis of glass structure or components.In this paper,the failure process of single-layer glass plate and laminated glass plate under lowspeed and high-speed impact are studied.For the study of the failure process of single-layer glass circular plate under low-speed impact,the rate-dependent cohesive zone model is used to calculate the structural response.For the study of the damage process of square glass plate under high-speed edge-on impact,the improved TCK constitutive model is used to analyze the damage of tension element and compression element at the same time at any non-zero strain rate.According to a series of drop weight tests of laminated glass plates with different thickness,a three-stage failure model of laminated glass plates was concluded,and the failure process was analyzed by TCK-JH2 combined constitutive model.The main research work of this paper is as follows:(1)The impact mechanical properties of soda-lime glass materials were studied by Hopkinson pressure bar test and dynamic split test numerically.In the Hopkinson bar test,the effects of inertia,friction and specimen shape on the test results are considered.In the dynamic splitting test,the accuracy of numerical test is improved by modifying JH2 parameters.The direct loading method,the soft strip method,the rigid strip method and the flatten specimen method are compared and analyzed,and the correction coefficient of the soft strip method is proposed.(2)A rate-dependent cohesive zone model(RDCZM)was established to describe the brittle fracture of soda-lime glass materials.On this basis,the failure process of single-layer glass circular plate impacted by low velocity was studied,and the numerical calculation results were compared with the test results.(3)The TCK constitutive model is improved so that it can analyze the damage of compression element and tension element at the same time at any non-zero strain rate.Then the shape and size of damage area,damage propagation process and stress wave propagation process of square glass plate under high-speed edge-on impact are studied.The numerical simulation results of the edge-on impact test are compared with the relevant test results,and the calculation accuracy of the damage propagation and stress wave propagation process in this paper is analyzed.(4)The failure process of laminated glass under low speed impact is studied.Two basic failure modes are summarized: punching failure mode and bending failure mode.A three-stage failure model of laminated glass plate under low-speed impact is proposed,and the theoretical basis for dividing different failure stages is given.(5)The restoring stiffness and integration accuracy of TCK-JH2 composite constitutive model of soda-lime glass materials are studied and applied to the low-speed impact response calculation of laminated glass plate.The calculation results are compared with the relevant test results.Furthermore,it is found that the critical volume strain and the stiffness of the interlayer material affect the impact resistance of the laminated glass plate.