Three-point bending test device with laser centering device

Abstract

The invention discloses a three-point bending test device with a laser centering device. The three-point bending test device comprises a lower support beam, an upper pressure head, two lower supports and the laser centering device, wherein a plurality of diamond-shaped and / or isosceles-triangle-shaped centering signs of which the symmetry axes are on the same straight line are arranged on the center lines of the top surface and the side surface of the lower support beam; a plurality of diamond-shaped and / or isosceles-triangle-shaped centering signs of which the symmetry axes are on the same straight line are arranged on the center line of the side surface of the upper pressure head; each lower support comprises a stretched spring, a base and a lower support roller, and the stretched spring is connected with the base and a suspension loop on the lower support roller; the base is connected with a slider under the base via tightening bolts, and the slider can slide in a concave chute in the lower support beam; the laser centering device comprises a cross laser. The three-point bending test device realizes centering according to beams of the cross laser, so that influence on centering from artificial subjective factors is reduced, and the accuracy of testing results is guaranteed.

Description

Technical field [0001] The invention relates to a metal material fatigue fracture test device, in particular to a three-point bending test device with a laser centering device, which is applied in the field of metal material mechanical property testing. Background technique [0002] Fatigue fracture test is a relatively high-end test item in the field of metal material testing. The purpose is to test the toughness of materials, that is, the ability to resist crack initiation and propagation. Its main characterization parameters include KIC, CTOD, JIC, da / dn, etc. Steel products such as pipeline steel, bridge steel, offshore platform steel, and heavy rail have clearly stated in their standards that such data is required as acceptance indicators. Therefore, fatigue fracture test is an important factor in the development of high-end structural steel. A common feature of the fatigue fracture test is that a notch (simulated crack) needs to be opened in the standard specimen, and then...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a three-point bending test device with a laser centering device, which solves the problem of poor centering accuracy and high uncertainty caused by naked eye observation for the centering of existing samples and upper and lower rollers The error problem caused by the test can improve the test efficiency while improving the test accuracy

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