Dynamic Zr Based Amorphous Alloy Material Constitutive Relation And Release Energy Effect Reserch

Amorphous alloys have the characteristics of the structure of the liquid state and no grain boundaries, dislocations, etc. these characteristics make the amorphous alloys with some unique mechanical properties, such as high strength, high hardness, high fracture toughness and good resistance to shear. From the view of energy, energy of the amorphous alloy is higher than that of the same component crystalline alloy, in the metastable state of energy. Zr based bulk amorphous alloy system owns a large negative mixing enthalpy, which can produce a strong exothermic reaction. Therefore, the amorphous alloy can be considered as one of the energetic materials. In this paper, the static and dynamic mechanical properties and high pressure (10GPa-30GPa) release energy effect of a ZrTiNiCuBe bulk amorphous alloy are studied by experimental research and theoretical analysis. The results can be used to study the fracture, rheological behavior and engineering application of amorphous alloys. The main research contents of this paper include the following four aspects.(1) The static and dynamic test data of amorphous alloy materials is obtained by MTS and SHPB test equipment, and SEM is used to characterize the microstructure and the fracture characteristics of materials are revealed. In the deformation process, the variation of the temperature rise in the region of shear deformation can be inferred by the elastic strain energy variation. At the same time, the strain rate effect of the material is explained by the characteristic time.(2) According to MTS, SHPB test results and material fracture characteristics, JH-2 model and J-C model, the empirical constitutive equation of the material is established, and the accuracy of the constitutive equation is verified. (3) Under the condition of high pressure, experimental research on shock release energy effect of amorphous alloy to thin target fragment is made. Using the pressure sensor to measure the time history curves of pressure around target, high-speed photography to observe reaction process when fragments penetrated target plate, and observe the damage effect of target plate. The test pressure, high speed photography, target damage effect of the three points that impact in the process of amorphous alloy fragment whether a chemical reaction. A model for evaluating the effect of shock release reaction is established, and presents a simple description of the reaction mechanism. (4)Under the condition of impact loading at high speed, plain concrete target is penetrated by amorphous alloy fragment and 30CrMnMo fragment respectively, penetration characteristics is studied, under comparison of two fragment penetration depth, surface damage of the target, this paper makes corresponding explanation, the pit corner of amorphous alloy fragment is calculated.