3D printing sample tensile failure performance analysis method

Abstract

The invention discloses a 3D printing sample tensile failure performance analysis method which comprises the following steps of adopting 3D printing to print a tensile sample strip, and arranging speckles on the surface of the tensile sample strip, placing the tensile sample strip in a tensile test device, and debugging the tensile test device, before the test, collecting an initial image of the tensile sample strip, carrying out a tensile test, and collecting an image of the tensile sample strip in the whole tensile test process, performing contrastive analysis on the original image and the deformed target image by using a digital image correlation method to obtain pixel point displacement and strain information, and according to the strain information, obtaining a stress-strain curve, and obtaining sample performance parameters and a strain line.

Description

technical field [0001] The invention belongs to the field of tensile testing of 3D printing samples, and in particular relates to a method for analyzing the tensile failure performance of 3D printing samples. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The traditional method of experimental mechanics research is contact type, and the method of pasting strain gauges has been widely used in scientific research experiments and engineering due to its advantages of high precision, simple operation, small size, light weight, and large measurement range. For complex cases, the accuracy of the test will be reduced. After all, sometimes it is pasted on the surface of the sample, which has a certain impact on the sample, and often a large number of strain gauges need to be pasted on the surface of a sample and cannot be recycled again. , both in the fie...

AI Technical Summary

Problems solved by technology

Many scholars at home and abroad have gradually realized the limitations of electrical measurement methods and can find a way out from optical measurement methods. Compared with these traditional optical measurement methods, digital image correlation method has the advantages of measuring the whole field strain, simple operation, and low requirements on environmental conditions. and other advantages, so it is widely used in engineering research, but the inventor found that the traditional mechanical performance test can only obtain the stress-strain relationship curve and its peak strength before the sample is destroyed, which is of great significance to the development and development of the additive manufacturing industry. In-depth research on the destructive properties of printed samples is far from meeting the requirements

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