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A three-point bending test device with a laser centering device

A technology of laser centering and three-point bending, which is applied in the direction of applying a stable bending force to test the strength of materials, measuring devices, surveying and mapping, and navigation. It can solve problems such as high uncertainty and poor centering accuracy, and achieve production costs. Low weight, simple structure, and the effect of improving test accuracy and clamping efficiency

Active Publication Date: 2018-06-12
武汉钢铁有限公司
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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

Method used

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  • A three-point bending test device with a laser centering device
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  • A three-point bending test device with a laser centering device

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0037] see Figure 2-Figure 12 , a three-point bending test device with a laser centering device, including a lower support beam 1, an upper indenter 3, two lower supports 2 placed on the lower support beam 1, and a laser alignment device connected to the upper indenter 3 The middle device 4; the two lower supports 2 are respectively located on both sides of the center line of the lower support beam 1, and the distance to the center line is equal;

[0038] The upper part of the lower support beam 1 is provided with a concave chute 8, two diamond-shaped centering marks 6 are provided on the center ...

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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 performance 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 are KIC, CTOD, JIC, da / dn, etc. Steel products such as pipeline steel, bridge steel, offshore platform steel, and heavy rail clearly state in their standards that such data are required as acceptance indicators. Therefore, the 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 it is necessary to open a gap (simulated crack) on the standard sample, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/20G01C15/00
Inventor 余立薛欢李荣锋刘冬杜丽影彭文杰严龙
Owner 武汉钢铁有限公司
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