Cold spraying particle collision simulation method based on cylindrical coordinate system constraint

Abstract

The invention discloses a cold spraying particle collision simulation method based on cylindrical coordinate system constraint, and belongs to the field of material processing. The method comprises the following steps: firstly, establishing a cylindrical slice-shaped model of cold spraying particle collision under a three-dimensional rectangular coordinate system by adopting an Euler method; then respectively carrying out material attribute setting and model assembling, and establishing an analysis step suitable for thermal-mechanical coupling analysis; meanwhile, in order to solve the problem that constraint conditions of a cylinder slice model cannot be correctly preset under a three-dimensional rectangular coordinate system, a local cylindrical coordinate system is established, the constraint conditions of the model are preset under the cylindrical coordinate system, and finally a finite element model capable of accurately simulating the collision process of the cold spraying high-speed solid metal particles is obtained. Under the condition that the grid precision is guaranteed, the calculation time is short, an accurate calculation result is obtained, and a foundation is laid for prediction of the critical speed of cold spraying particles and rapid research of particle deposition behaviors.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a collision simulation method of cold spray particles under the constraint of a cylindrical coordinate system. Background technique [0002] In nature, in daily life, in industrial production, and in the use of equipment, various relative collision phenomena occur from time to time, ranging from celestial bodies such as asteroids and comets in space to colliding with planets, to small molecules, Atoms, electrons or protons, such as proton colliders. Some of the above-mentioned collisions are harmful and need to be avoided; some are useful and should be used wisely. In the field of material processing, there is a method for preparing coatings based on high-speed (usually 300-1500m / s) impact deposition of micron-sized (usually 5-50 μm) metal particles, called cold spray (cold spray or cold spraying, CS), It is also one of the advanced technologies for the preparatio...

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention provides a method for simulating the collision of cold spray particles based on a cylindrical coordinate system. model; at the same time, in order to solve the problem that the constraints of the cylinder slice model cannot be correctly preset under the three-dimensional rectangular coordinate system, the present invention adopts the establishment of a local cylindrical coordinate system, and presets the constraint conditions of the model under the cylindrical coordinate system, and finally obtains a The finite element model for simulating the collision process of high-speed solid metal particles in cold spraying is more accurate. Under the condition of ensuring the grid accuracy, the calculation time is short and the accurate calculation results are obtained, which lays a solid foundation for the prediction of the critical velocity of cold spraying particles and the rapid study of particle deposition behavior. foundation

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