Double-propping head incubator for low-temperature CTOD (Crack Tip Opening Displacement) tests

Abstract

The invention discloses a double-propping head incubator for low-temperature CTOD (Crack Tip Opening Displacement) tests. The double-propping head incubator comprises a rotational low-temperature tank, a buckling failure propping head, a breaking propping head, a liquid discharge micro ball valve, limiting screws and a test machine connecting plate, wherein the rotational low-temperature tank is a tank body of which the upper end is opened; the buckling failure propping head and the breaking propping head are arranged inside the rotational low-temperature tank; the liquid discharge micro ball valve is mounted on a side wall of the rotational low-temperature tank; two sides of the rotational low-temperature tank are positioned by using the limiting screws; the test machine connecting plate is arranged at the bottom of the rotational low-temperature tank. Therefore, when low-temperature CTOD tests are implemented, rapid and accurate positioning of a double-point pressing head and two single-point propping heads can be achieved, so that two test steps of buckling failure loading and breaking of a test piece can be continuously completed by using one universal test machine, the working efficiency and the precision of tests are improved, and the working intensity of testers can be alleviated.

Description

technical field [0001] The invention relates to the technical field of mechanical performance tests of steel materials and welded joints, in particular to a double-head incubator for low-temperature CTOD tests used for low-temperature fracture performance evaluation tests of steel materials and welded joints. Background technique [0002] CTOD (Crack Tip Opening Displacement) test is an effective method to evaluate the fracture resistance of materials and welded joints, and it is a standard test method in many standards at home and abroad. In the process of CTOD test, the two test steps of specimen instability failure loading and rapid crushing loading must be carried out successively. ) head is subjected to three-point bending, and the instability failure and rapid crushing of the specimen are carried out successively. [0003] When carrying out the low temperature CTOD test, the instability failure and rapid pressure breaking of the specimen must be carried out at low tem...

AI Technical Summary

Problems solved by technology

Therefore, when the low-temperature CTOD test is carried out under the current working mode and test conditions, there are problems such as low test work efficiency, difficulty in ensuring test accuracy, potential safety hazards in the test process (personnel frostbite), and high labor intensity for test personnel.

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