To Study The Dynamic Mechanical Properties Can Contain Structural Materials

The dynamic behaviour of the Multifunctional Energetic Structural Materials (MESMs) was studied by using the experimental research, theoretical analysis and numerical simulation. Typical MESMs specimens were fabricated, mesostructure characteristics were analysed, the quasi-static and dynamic behaviours of the those materials were studied by using universal material machine and Split Hopkinson Pressure Bar (SHPB) experimental, the constitutive equations of those materials were determined based on the experimental data, the constitutive model and its parameters were validated by the numerical simulation software of ABAQUS. The main contents and conclusions as follows:(1) MESMs specimen preparation and quasi-static mechanical propertiesDifferent proportions and aluminum particle sizes of Al/PTFE/W specimens were made by powder mixing, pressing and sintering, and their mesoscopic features were analyzed. The quasi-static behaviours of those materials were investigated by using universal material testing machine. The quasi-static stress-strain curves of the different proportions of Al/PTFE/W were got. The results showed that the mechanical performance of Al/PTFE/W was influnced by several factors, such as the proportion, the particle size, the process of craftwork and so on.(2) The dynamic mechanical performance of MESMs was studied based on SHPB experimental techniqueThe dynamical behaviour of the W-Zr alloy and Al/PTFE/W which contained different proportions and aluminum particle sizes were investigated by using SHPB experiment. The procedure to get the curves of the stress-strain and the waves of the SHPB were compiled, and the stress-strain curves in different strain rates of the two materials were obtained. The results showed that the dynamic mechanical properties of W-Zr alloy were distinctly different in impact loads, which would broken to fragments in small strain rates and would react in middle strain rates. Besides, the dynamic behaviours of the Al/PTFE/W which contain different proportions or aluminum particle sizes were distinctly different.(3) The constitutive model of MESMs was investigatedBased on the quasi-static and dynamic experiments, the elastic-brittle damage constitutive model was used to describe the dynamic behaviour of the W-Zr alloy and Johnson-Cook constitutive model was used to describe the dynamic mechanical properties of AI/PTFE/W.The various parameters of the constitutive equations were determined based on the stress-srain curves. The dynamics software ABAQUS was used to simulate the SHPB experimental process in order to assess the constitutive model which was used describe behaviour of Al/PTFE/W was logical or not. The results showed that the outcomes of simulation and the SHPB experiment were nearly tally.