Device for preparing stress corrosion U-shaped test sample

Abstract

The invention belongs to the technical field of testing the mechanical performance of metal materials, and relates to a device for preparing a stress corrosion U-shaped test sample. The device comprises a framework, an extrusion device, a roller press mold and a transmission device. The invention provides a device for creatively preparing a U-shaped test sample on the premise of meeting the demand of stress corrosion standard of government standard (GB) and civil aviation (MH) and the like, and the purpose of preparing the U-shaped stress corrosion test sample with high efficiency and high precision can be achieved by adopting five technical measures including controlling the preparation precision of arc diameter of the test sample, controlling the alignment precision of the test sample in extrusion, measuring the extrusion displacement of a pressure head and of the stopping position of a marking middle plate, and meeting preparation of different sizes of test samples, and obtaining test sample arc sections with high appearance quality. The preparation precision of arc diameter of the test sample is controlled to be less than 0.2mm, and is controlled by adjusting the precision of space of inner edges of rollers; and the position of cursor positioning slider can be adjusted according to the length of the test sample, so as to ensure high alignment precision of the test sample.

Description

technical field [0001] The invention belongs to the technical field of metal material mechanical performance testing, and relates to a device for preparing stress corrosion U-shaped samples. Background technique [0002] Stress corrosion refers to the damage caused by metal in corrosive medium under the action of tensile stress. At present, the main stress corrosion test methods include constant deformation test, constant load test, slow strain rate test and fracture mechanics test. The constant deformation method is a method to make the sample deform to a certain extent and evaluate its SCC (stress corrosion cracking) sensitivity in the test environment. There are many sample shapes and means used in this method, commonly used are U-shaped, C-shaped rings, curved beam samples, etc., and clamps or bolts are generally used to fix the deformation of the sample to load the stress. The advantage of this method is that it is simple, economical, and the sample is compact, and it...

AI Technical Summary

Problems solved by technology

At present, on the one hand, the requirements for the sample preparation devices in the stress corrosion test standards are mostly not clear enough, resulting in uneven quality of the samples prepared by different personnel; on the other hand, the U-shaped sample preparation devices used in different test standards are not the same , there is a lack of a U-shaped sample preparation device commonly used in existing test standards

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