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Clamp for testing annular tensile property of tubular product

A test fixture and hoop stretching technology, applied in the direction of analyzing materials, strength characteristics, measuring devices, etc., can solve the problems of low accuracy and high test cost, and achieve the effects of accurate measurement, reduced test cost, and compact structure

Active Publication Date: 2012-05-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of high test cost and low accuracy of pipe hoop tensile performance measurement in the prior art, the present invention proposes a pipe hoop tensile performance test fixture

Method used

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  • Clamp for testing annular tensile property of tubular product
  • Clamp for testing annular tensile property of tubular product
  • Clamp for testing annular tensile property of tubular product

Examples

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Comparison scheme
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Embodiment Construction

[0024] This embodiment is a jig for testing the hoop tensile properties of pipes, which is suitable for testing the hoop tensile properties of pipes with an inner diameter of 60-100 mm and an inner diameter of 100-150 mm. In this embodiment, the fixture is described by taking the hoop tensile performance test applicable to pipes with an inner diameter of 60-100 mm as an example.

[0025] The pipe tested in this embodiment is a QSTE340 high-strength steel pipe of φ88×3.2 mm (outer diameter×wall thickness), and the axial height of the pipe sample is 12 mm.

[0026] This embodiment is a symmetrical structure, including a first inner insert 1, a second inner insert 10, two inner lining rings 2, two outer lining rings 3, a first clamping block 5, a second clamping block 8, and 2 The middle layer backing ring 9 and the pipe sample 7. The first inner insert 1 and the second inner insert 10 have the same structure, and the first clamping block 5 and the second clamping block 8 have t...

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Abstract

The invention discloses a clamp for testing the annular tensile property of a tubular product. An inner liner ring, a middle layer liner ring and an outer liner ring are formed by folding two semicircular rings of the same diameter respectively; the inner liner ring, the middle layer liner ring and the outer liner ring are embedded in sequence, so that a liner ring body is formed; a first inner insert and a second inner insert are semicircles of the same diameter, and are folded to form a circular block; the liner ring body is sleeved on the first inner insert and the second inner insert; a tubular product sample is sleeved on the outer surface of the liner ring body; and the liner ring body on which the tubular product sample is sleeved is embedded into a first fixture block and a secondfixture block. The clamp has a compact structure and is convenient to replaced; components are connected tightly; and measurement of the annular tensile properties of tubular products of various specifications can be realized on an ordinary material tester. Testing of the annular tensile properties of tubular products of which the inner diameters are 60-150 millimeters can be met by only changingthe combination way of the inner inserts and the liner rings, high generality is realized, the testing cost is reduced, and accurate measurement of the annular tensile properties of tubular products is realized.

Description

technical field [0001] The invention relates to a jig for testing the mechanical properties of materials, in particular to a jig for testing the hoop tensile properties of pipes. technical background [0002] At present, pipes and their secondary processing parts have been widely used in industry. When performing secondary processing on pipes (such as bending and bulging), pipes are required to have certain plastic deformation capabilities. Testing the mechanical properties of pipes is an important method to evaluate the plastic deformation ability of pipes. Due to the influence of material structure and production process, there are great differences in the performance of pipes in the axial and hoop directions. The mechanical properties of the axial direction of the pipe are generally obtained by the uniaxial tensile test standard (GB / T228-2002 tensile test method for metal materials at room temperature), and the mechanical property test method of the circumferential direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/04
Inventor 杨合刘静詹梅
Owner NORTHWESTERN POLYTECHNICAL UNIV
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