new form of equivalent constitutive model for combined shell particle composites and its application in civil air defense

In this study, the new combined shell particle composites are designed and manufactured, and simulation-blasting tests are conducted using a new material as the distribution layer of a civil air defense project. tests show that this type of new distribution layer is highly capable of weakening blasting shock waves. because of this distribution layer being a complicated, heterogeneous structural material, and numeric simulation of the problem is difficult, even impossible, so we present a new form of equivalent constitutive model to simulate the dynamic behavior of it under blast. the material parameters are optimized by comparing and achieving the best acceptable agreement of the calculated and experimental results, both for the peak stresses and the stress history curves at the same points. results show that the differences between the calculated peak stresses of the equivalent constitutive model and test results are less than 8%. the stress history curves for calculated and experimental results are of similar evolution characteristics. the numerical simulation results of the stress pulsewidth at three measured points are relatively close to the experimental ones, and the calculated mean stresses at three measured points are also close to the experimental ones, the errors are about 10%. therefore, for the purpose of engineering application our equivalent constitutive model might be seen an acceptable model.