Analysis Of Dynamic And Static Compression And Wheel Penetration Behavior Of Foam Filled Concrete

With the development of world civil aviation, the aircrafts skid off the runway from time to time during taking-off and landing and the production and application of Engineered Material Arresting System(EMAS) can effectively reduce the damage of the accident. EMAS is consist of materials with specific mechanical properties, such as Foamed Concrete with good energy absorption, laying at the airport runway. Foam Filled Concrete(FFC) is a kind of lightweight material, which was made of cement and Polystyrene(EPS) particles. Foam Filled Concrete is expected to replace the aging Foamed Concrete which has worse performance in low temperature, because this new type material has the advantages of good energy absorption, stable performance and good durability. Firstly, the quasi-static compression experiment of FFC material was carried out and then the quasi-static compression constitutive equations were established by analyzing the experimental data. Secondly, on the base of verifying the reliability of the numerical simulation by using LS-DYNA, the mechanical performance of FFC material under impacting load were studied. Thirdly, the mechanical model of FFC material under quasi-static penetration of scaling wheel was established by combining the quasi-static penetration experiment. By combining the dynamic penetration experiment and LS-DYNA, the mechanical response of FFC under impacting penetration of scaling wheel was studied, analyzing the effects of scaling rate of wheel, impact velocity and EPS volume fraction on penetration curves and energy absorption. The specific studies were as follow:(1)Six kinds of different EPS volume fractions from 66.5% to 84.0% were produced based on the performance requirements of arresting material of EMAS. The quasi-static uniaxial compression experiment was carried out and the quasi-static compression constitutive equations were established and verified by experimental data. The quasi-static compression constitutive eqations considering the effect of EPS volume fraction were obtained and provides the constitutive equations for the follow-up numerical simulation.(2)After obtaining the quasi-static compression constitutive equations of FFC material, the macro isotropic finite element model of FFC specimen under drop impact load was built up by using LS-DYNA. Then the mechanical response of FFC material under impact load can be obtained. The effects of impact velocity and EPS volume fraction on impact response were analyzed after verifying simulation with experiment.(3)The quasi-static penetration experiment of scaling wheel was carried out, and mechanical model of FFC under quasi-static penetration load was established by analyzing the forces on scaling wheel under quasi-static penetration load. The effects of different scaling ratios and EPS volume fractions on mechanical response of FFC were discussed and analyzed after verifying with experiment. Finally, the macro isotropic finite element model of FFC under scaling wheel penetration was built up by using LS-DYNA and the response curves can be obtained. Then the finite element model was verified with experiment. The effects of different impact velocities and EPS volume fractions on mechanical response and energy absorption were analyzed on the base of verifying the simulation and experiment result.