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Circumferential mechanical property testing device of valve-model type thin-wall tube

A technology for testing equipment and pipe fittings, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems that the circumferential mechanical properties of the pipe fittings cannot be accurately represented, and the small-sized thin-walled pipe fittings cannot be cut and rolled. Achieve the effect of improving engineering reliability, improving test accuracy and eliminating test errors

Inactive Publication Date: 2010-08-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, re-deformation occurs during the flattening process, so the measured data cannot accurately represent the circumferential mechanical properties of the pipe fittings, not to mention that it is impossible to cut, flatten, and prepare samples for small-sized thin-walled pipe fittings.

Method used

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  • Circumferential mechanical property testing device of valve-model type thin-wall tube
  • Circumferential mechanical property testing device of valve-model type thin-wall tube
  • Circumferential mechanical property testing device of valve-model type thin-wall tube

Examples

Experimental program
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Effect test

Embodiment 1

[0019] This embodiment is a device for testing the circumferential mechanical properties of 7050 high-strength aluminum alloy pipe fittings. The specific size of the applicable test piece is 20mm×1mm, height is 20mm.

[0020] This embodiment includes a conical indenter 1 , a flap mold 2 and a protective sleeve 4 . Both the conical indenter 1 and the valve mold 2 are made of Cr12Mo1V1 steel, and the protective sleeve 4 is made of 45# steel. The valve mold 2 is placed in the tested tube 3, and there is a clearance fit between the two. The conical indenter 1 is located in the valve mold 2 and placed in the protective sleeve 4 together. There is a clearance fit between the maximum inner diameter of the protective sleeve and the outer diameter of the platform of the conical indenter.

[0021] The conical indenter 1 is a body of revolution, and its profile is "T" shape. One end of the conical indenter 1 is a matching platform in contact with the indenter of the mechanical prop...

Embodiment 2

[0026] This embodiment is a device for testing the circumferential mechanical properties of 7050 high-strength aluminum alloy pipe fittings. The specific size of the applicable test piece is 22mm×1mm, height 20mm.

[0027] This embodiment includes a conical indenter 1 , a flap mold 2 and a protective sleeve 4 . Both the conical indenter 1 and the valve mold 2 are made of Cr12Mo1V1 steel, and the protective sleeve 4 is made of 45# steel. The valve mold 2 is placed in the tested tube 3, and there is a clearance fit between the two. The conical indenter 1 is located in the valve mold 2 and placed in the protective sleeve 4 together. There is a clearance fit between the maximum inner diameter of the protective sleeve and the outer diameter of the platform of the conical indenter.

[0028] The conical indenter 1 is a body of revolution, and its profile is "T" shape. One end of the conical indenter 1 is a matching platform in contact with the indenter of the mechanical propert...

Embodiment 3

[0033] This embodiment is a device for testing the circumferential mechanical properties of 69111 high-strength steel pipe fittings. The specific size of the applicable test piece is 25mm×1mm, height 22mm.

[0034] This embodiment includes a conical indenter 1 , a flap mold 2 and a protective sleeve 4 . Both the conical indenter 1 and the valve mold 2 are made of Cr12Mo1V1 steel, and the protective sleeve 4 is made of 45# steel. The valve mold 2 is placed in the tested tube 3, and there is a clearance fit between the two. The conical indenter 1 is located in the valve mold 2 and placed in the protective sleeve 4 together. There is a clearance fit between the maximum inner diameter of the protective sleeve and the outer diameter of the platform of the conical indenter.

[0035] The conical indenter 1 is a body of revolution, and its profile is "T" shape. One end of the conical indenter 1 is a matching platform in contact with the indenter of the mechanical properties test...

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Abstract

The invention relates to a circumferential mechanical property testing device of a valve-model type thin-wall tube, comprising a cone-shaped pressure head, a value model and a protecting sleeve, wherein the valve model is positioned in a measured test tube, the cone-shaped pressure head is positioned in the value model, the cone-shaped pressure head and the value model are placed into the protecting sleeve together, the maximal inner diameter of the protecting sleeve is in clearance fit with the outer diameter of a platform of the cone-shaped pressure head, a half-cone angle of the extrusion work end taper of the cone-shaped pressure head is 8 degrees or 10 degrees or 12 degrees or 15 degrees, the valve model comprises a plurality of values with the same shape and structures, the aperture of one end of an inner hole of the protecting sleeve is equal to the outer diameter of the fitting platform of the cone-shaped pressure head, the aperture of the middle part of the protecting sleeve is larger than the outer diameter of the measured test tube, the aperture of the other end of the protecting sleeve is larger than the outer diameter of the cone-shaped end of the fitted cone-shaped pressure head, and after the cone-shaped end of the cone-shaped pressure head is not interfered with the protecting sleeve after being arranged in the inner hole. In a loaded process on a material mechanical property testing machine, the axial pressure is converted into radial bulging force, and the real circumferential mechanical property of the thin-wall tube is accurately obtained, thereby providing accurate mechanical property support for subsequent design and engineering application of the thin-wall tube.

Description

technical field [0001] The invention relates to the field of testing the mechanical properties of materials, in particular to a testing device for testing the circumferential mechanical properties of thin-walled pipe fittings by means of extrusion and expansion. Background technique [0002] The use of pipe fittings and sleeves is all involved in aviation, aerospace, automobile, mechanical equipment and other fields. Taking an aircraft as an example, the piping system is the lifeline of the aircraft, and its performance directly affects the overall performance of the aircraft. Therefore, it is very important to improve the technical level of the pipeline system to improve the performance of the aircraft. The hydraulic pipeline is the part with the highest working pressure and the strictest reliability requirements among all the pipelines of the aircraft. The level of aircraft pipeline system technology is concentrated in the hydraulic pipeline system. For the hydraulic sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 范娟李付国虞文军李剑飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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