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Buckling-restrained device for fracture toughness test and test method

A fracture toughness and anti-buckling technology, which is applied in the direction of measuring devices, strength characteristics, and the use of stable tension/pressure to test the strength of materials, so as to improve the utilization rate and solve the effect of inaccurate experimental results

Active Publication Date: 2021-08-03
上海航空材料结构检测股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the buckling problem that cannot be avoided with the increase of the tensile load during the fracture toughness test of the current metal thin plate test piece, the present invention provides an anti-buckling device for the fracture toughness test, and provides an anti-buckling device using the anti-buckling device at the same time. Apparatus for Fracture Toughness Tests

Method used

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  • Buckling-restrained device for fracture toughness test and test method
  • Buckling-restrained device for fracture toughness test and test method
  • Buckling-restrained device for fracture toughness test and test method

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Embodiment 1

[0035] Such as figure 1 and figure 2 As shown, this embodiment provides an anti-buckling device for fracture toughness testing, including a testing machine base 1, a pair of horizontal testing machine beams 20 above the testing machine base 1, and a clamp for fixing the test piece 6 on the testing machine base 1 The clamping mechanism includes a pair of brackets 2 fixed on the base 1 of the testing machine, and a pair of clamps 5 slidably connected to the brackets 2 for clamping the front and rear sides of the test piece 6 and two groups of clamping plates 7 fixed to each other, and the upper support structure and the lower support structure respectively used to support the upper part of the clamping plate 7, wherein the left and right ends of the test piece 6 are respectively clamped on the In the pair of clamps 5 described above, the clamping plate 7 is arranged between the pair of brackets 2, and the bottom of the clamping plate 7 is equipped with a roller bracket 8, and ...

Embodiment 2

[0046] This embodiment proposes a method for performing a fracture toughness test using the above-mentioned anti-buckling device, comprising the following steps:

[0047] 1. Coaxiality inspection: Before the tensile test starts, in order to ensure the accuracy of the test results, it is necessary to check whether the coaxiality of the testing machine and the fixture 5 meets the requirements with the adjustment piece. The adjustment piece and the test piece 6 The specifications are the same, and the coaxiality test refers to the standard ASTM E1012-14. The specific steps are as follows:

[0048] (1) if figure 1 and Figure 5 As shown, the strain gauges 25 of the strain acquisition system are first attached to the corresponding symmetrical positions on both sides of the debugging piece, and then the two ends of the fixture 5 and the chuck of the testing machine are fixedly connected by bolts through the stretching holes 21; Insert both ends of the piece into the fixture 5, and...

Embodiment 3

[0066] This embodiment draws K according to the results of the fracture toughness test of the above-mentioned embodiment R curve.

[0067] In the above-mentioned embodiment, the initial crack length is 314 mm after the prefabricated crack is used with the stress ratio R=0.1, and then the tensile test is started. The load-crack opening displacement curve during the test is as follows: Figure 8 shown by Figure 8 It can be seen that in the linear elastic stage of the curve and the load drop stage after yielding, the overall shape of the curve is relatively stable and smooth, and there is no sawtooth or wave shape, which indicates that during the test, as the load continues to increase, the test piece does not No obvious buckling occurred, which further shows that the anti-buckling device in the present invention has a good effect in preventing buckling deformation of the test piece 6 .

[0068] After analyzing the results of the above load-crack opening displacement, take the...

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Abstract

The invention provides a buckling-restrained device for a fracture toughness test, which comprises a testing machine base, a pair of testing machine beams and a clamping mechanism on the testing machine base, wherein the clamping mechanism comprises a pair of supports fixed on the testing machine base, a pair of clamps connected to the supports in a sliding mode, two sets of clamping plates used for clamping the front side and the rear side of a test piece, an upper supporting structure used for supporting the upper portion of the clamping plate and a lower supporting structure used for supporting the lower portion of the clamping plate, and the left end and the right end of the test piece are clamped in the pair of clamps; and the clamping plate is arranged between the pair of supports, and a roller support is arranged at the bottom of the clamping plate and is arranged on the test piece base. The device solves the problem that the experiment result is inaccurate due to buckling deformation of the test piece, and is suitable for test pieces of various specifications; and meanwhile, the invention also provides a method for carrying out a fracture toughness test by using the buckling-restrained device.

Description

technical field [0001] The invention belongs to the field of fracture toughness testing, in particular to an anti-buckling device and testing method for fracture toughness testing. Background technique [0002] Metal sheets are widely used in the skin of the aircraft fuselage and the connection between the wing and the fuselage. During the take-off, landing and cruising stages of the aircraft, with the continuous adjustment of the flight attitude of the aircraft, the fuselage is subjected to the torsion of the wings, and the wings are also affected. The effect of lift is to swing up and down, and these parts are constantly subjected to random loads during the flight of the aircraft. In consideration of flight safety, higher requirements are required for the materials used in the fuselage, that is, no cracks or even fractures will occur when subjected to the above-mentioned forces. Therefore, the fracture toughness of aircraft fuselage skin materials has become an important a...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/04G01N3/02
CPCG01N3/08G01N3/04G01N3/02G01N2203/0017G01N2203/0067G01N2203/0282G01N2203/0423
Inventor 程瑞松宋文炜张建波黄剑进刘建中
Owner 上海航空材料结构检测股份有限公司
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