Method for testing fatigue performance of 3D printed part

Abstract

The invention relates to the technical field of experimental testing, and particularly discloses a method for testing the fatigue performance of a 3D printed part. The method for testing the fatigue performance of the 3D printed part comprises the steps that the mechanical property parameters of the 3D printed part are determined; a loading coefficient and a stress ratio are determined according to the mechanical property parameters; a maximum stress load and a minimum stress load are determined according to the loading coefficient and the stress ratio; the loading coefficient is reduced levelby level, and the maximum stress load corresponding to the loading coefficient of each level is obtained; and a fatigue test is performed on the 3D printed part according to the maximum stress load corresponding to the loading coefficient of each level, and the fatigue life of the 3D printed part corresponding to the maximum stress load of each level is obtained. According to the method for testing the fatigue performance of the 3D printed part, the performance test of the fatigue life of the 3D printed part can be realized.

Description

technical field [0001] The invention relates to the technical field of testing and testing, in particular to a method for testing the fatigue performance of 3D printed molded parts. Background technique [0002] 3D printing technology originated from the rapid prototyping technology that appeared in the 1980s, also known as additive manufacturing technology. It is different from the subtractive manufacturing of our traditional manufacturing industry. Discrete material (such as liquid, powder, wire, sheet, plate, block, etc.) molding material, in the form of layer by layer printing to produce a three-dimensional solid model, is to layer the 3D model into several two-dimensional cross-sections, The 3D printer prints the layered two-dimensional cross-section by layer by layer, and finally produces the physical model we need. At present, 3D printing technology has been widely used in aerospace, medical equipment, auto parts, personalized electronic products and other fields due...

AI Technical Summary

Problems solved by technology

However, the density of 3D printed products is not as high as that of castings. The lamination effect makes the surface rough, and the internal holes cannot be completely eliminated, which will seriously affect its fatigue performance. Therefore, it is of great significance to study the fatigue test of 3D printed formed parts.

The performance testing of metal 3D printing formed parts is currently mainly focused on mechanical properties, chemical composition, metallographic structure, etc. There are relatively few studies on fatigue performance testing methods. Therefore, how to provide a fatigue performance testing method for 3D printing formed parts Become a technical problem to be solved urgently by those skilled in the art

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