A kind of imitation explosion gradient multicellular bullet and design and manufacture method thereof

Abstract

The present invention provides an imitation explosion gradient multicellular bullet and a design and manufacture method thereof. The design and manufacture method includes: step 1. Using a random scattering method to generate uniform multicellular material mesoscopic models of different relative densities, and using 3D printing technology Realize the materialization of the model; Step 2, perform a quasi-static compression test on the materialized uniform cellular materials with different relative densities to obtain the nominal stress-strain relationship; use the meso-statistical constitutive model of the cellular material to fit the experimental data , determine the relationship between the relevant material parameters and the relative density; step 3, reversely solve the relative density distribution of the bullet under a specific design load based on the shock wave model and Newton's law of motion; step 4, introduce a new random point method, in the cell Under the condition that the wall thickness is constant, the change of the distance between adjacent core points is controlled to generate a bullet mesoscopic model with a continuous gradient distribution of cell size, and the bullet is manufactured by 3D printing technology, and the density distribution of the bullet is further sliced ​​and verified. .

Description

technical field [0001] The invention relates to a reverse design method and the field of 3D printing new materials, in particular to an imitation explosion gradient multicellular bullet and a manufacturing method thereof Background technique [0002] With the rapid development of 3D printing technology, it is possible to process multicellular materials with special types of mesostructures, but different 3D printing technologies may be suitable for processing different types of matrix materials and different types of mesostructures. [0003] The protective structure may be damaged or even fail due to the explosive load during service. The explosion load is a kind of strong dynamic load, which has the characteristics of transient, high strength and destructiveness. The structure may have nonlinear response or complex damage under the action of the explosion load. Therefore, the explosion test is the main way to know the impact resistance of the structure. one of the means. F...

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Problems solved by technology

In addition, when inside a closed container, a semi-closed container or around obstacles, the shape and attenuation law of the explosion load will be more complicated

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